* [PATCH v6 01/19] read-cache.c: fix constness of verify_hdr()
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 02/19] read-cache: allow to keep mmap'd memory after reading David Turner
` (17 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
read-cache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/read-cache.c b/read-cache.c
index d9fb78b..16cc487 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1345,7 +1345,7 @@ struct ondisk_cache_entry_extended {
ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
ondisk_cache_entry_size(ce_namelen(ce)))
-static int verify_hdr(struct cache_header *hdr, unsigned long size)
+static int verify_hdr(const struct cache_header *hdr, unsigned long size)
{
git_SHA_CTX c;
unsigned char sha1[20];
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 02/19] read-cache: allow to keep mmap'd memory after reading
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
2016-04-27 20:04 ` [PATCH v6 01/19] read-cache.c: fix constness of verify_hdr() David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff David Turner
` (16 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Later, we will introduce git index-helper to share this memory with
other git processes.
We only unmap it when we discard the index (although the kernel may of
course choose to page it out).
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
cache.h | 3 +++
read-cache.c | 13 ++++++++++++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/cache.h b/cache.h
index b829410..4180e2b 100644
--- a/cache.h
+++ b/cache.h
@@ -333,11 +333,14 @@ struct index_state {
struct split_index *split_index;
struct cache_time timestamp;
unsigned name_hash_initialized : 1,
+ keep_mmap : 1,
initialized : 1;
struct hashmap name_hash;
struct hashmap dir_hash;
unsigned char sha1[20];
struct untracked_cache *untracked;
+ void *mmap;
+ size_t mmap_size;
};
extern struct index_state the_index;
diff --git a/read-cache.c b/read-cache.c
index 16cc487..3cb0ec3 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1574,6 +1574,10 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (mmap == MAP_FAILED)
die_errno("unable to map index file");
+ if (istate->keep_mmap) {
+ istate->mmap = mmap;
+ istate->mmap_size = mmap_size;
+ }
close(fd);
hdr = mmap;
@@ -1626,11 +1630,13 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
src_offset += 8;
src_offset += extsize;
}
- munmap(mmap, mmap_size);
+ if (!istate->keep_mmap)
+ munmap(mmap, mmap_size);
return istate->cache_nr;
unmap:
munmap(mmap, mmap_size);
+ istate->mmap = NULL;
die("index file corrupt");
}
@@ -1655,6 +1661,7 @@ int read_index_from(struct index_state *istate, const char *path)
discard_index(split_index->base);
else
split_index->base = xcalloc(1, sizeof(*split_index->base));
+ split_index->base->keep_mmap = istate->keep_mmap;
ret = do_read_index(split_index->base,
git_path("sharedindex.%s",
sha1_to_hex(split_index->base_sha1)), 1);
@@ -1698,6 +1705,10 @@ int discard_index(struct index_state *istate)
free(istate->cache);
istate->cache = NULL;
istate->cache_alloc = 0;
+ if (istate->keep_mmap && istate->mmap) {
+ munmap(istate->mmap, istate->mmap_size);
+ istate->mmap = NULL;
+ }
discard_split_index(istate);
free_untracked_cache(istate->untracked);
istate->untracked = NULL;
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
2016-04-27 20:04 ` [PATCH v6 01/19] read-cache.c: fix constness of verify_hdr() David Turner
2016-04-27 20:04 ` [PATCH v6 02/19] read-cache: allow to keep mmap'd memory after reading David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-28 18:58 ` Junio C Hamano
2016-04-27 20:04 ` [PATCH v6 04/19] index-helper: add --strict David Turner
` (15 subsequent siblings)
18 siblings, 1 reply; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner, Ramsay Jones
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Instead of reading the index from disk and worrying about disk
corruption, the index is cached in memory (memory bit-flips happen
too, but hopefully less often). The result is faster read. Read time
is reduced by 70%.
The biggest gain is not having to verify the trailing SHA-1, which
takes lots of time especially on large index files. But this also
opens doors for further optimiztions:
- we could create an in-memory format that's essentially the memory
dump of the index to eliminate most of parsing/allocation
overhead. The mmap'd memory can be used straight away. Experiment
[1] shows we could reduce read time by 88%.
- we could cache non-index info such as name hash
Shared memory is done by storing files in a per-repository temporary
directory. This is more portable than shm (which requires
posix-realtime and has various quirks on OS X). It might even work on
Windows, although this has not been tested. The shared memory file's
name follows the template "shm-<object>-<SHA1>" where <SHA1> is the
trailing SHA-1 of the index file. <object> is "index" for cached index
files (and might later be "name-hash" for name-hash cache). If such
shared memory exists, it contains the same index content as on
disk. The content is already validated by the daemon and git won't
validate it again (except comparing the trailing SHA-1s).
We keep this daemon's logic as thin as possible. The "brain" stays in
git. So the daemon can read and validate stuff, but that's all it's
allowed to do. It does not add/create new information. It doesn't even
accept direct updates from git.
Git can poke the daemon via unix domain sockets to tell it to refresh
the index cache, or to keep it alive some more minutes. It can't give
any real index data directly to the daemon. Real data goes to disk
first, then the daemon reads and verifies it from there. Poking only
happens for $GIT_DIR/index, not temporary index files.
$GIT_DIR/index-helper.sock is the socket for the daemon process. The
daemon reads from the socket and executes commands.
Named pipes were considered for portability reasons, but then commands
that need replies from the daemon would have open their own pipes,
since a named pipe should only have one reader. Unix domain sockets
don't have this problem.
On webkit.git with index format v2, duplicating 8 times to 1.5m
entries and 236MB in size:
(vanilla) 0.50 s: read_index_from .git/index
(index-helper) 0.18 s: read_index_from .git/index
Interestingly with index v4, we get less out of index-helper. It makes
sense as v4 requires more processing after loading the index:
(vanilla) 0.37 s: read_index_from .git/index
(index-helper) 0.22 s: read_index_from .git/index
[1] http://thread.gmane.org/gmane.comp.version-control.git/247268/focus=248771
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
---
.gitignore | 1 +
Documentation/git-index-helper.txt | 47 ++++++
Makefile | 5 +
cache.h | 2 +
git-compat-util.h | 1 +
index-helper.c | 285 +++++++++++++++++++++++++++++++++++++
read-cache.c | 122 ++++++++++++++--
t/t7900-index-helper.sh | 23 +++
8 files changed, 477 insertions(+), 9 deletions(-)
create mode 100644 Documentation/git-index-helper.txt
create mode 100644 index-helper.c
create mode 100755 t/t7900-index-helper.sh
diff --git a/.gitignore b/.gitignore
index 5087ce1..b92f122 100644
--- a/.gitignore
+++ b/.gitignore
@@ -71,6 +71,7 @@
/git-http-fetch
/git-http-push
/git-imap-send
+/git-index-helper
/git-index-pack
/git-init
/git-init-db
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
new file mode 100644
index 0000000..77687c0
--- /dev/null
+++ b/Documentation/git-index-helper.txt
@@ -0,0 +1,47 @@
+git-index-helper(1)
+===================
+
+NAME
+----
+git-index-helper - A simple cache daemon for speeding up index file access
+
+SYNOPSIS
+--------
+[verse]
+'git index-helper' [options]
+
+DESCRIPTION
+-----------
+Keep the index file in memory for faster access. This daemon is per
+repository.
+
+OPTIONS
+-------
+
+--exit-after=<n>::
+ Exit if the cached index is not accessed for `<n>`
+ seconds. Specify 0 to wait forever. Default is 600.
+
+NOTES
+-----
+
+$GIT_DIR/index-helper.sock a Unix domain socket that the daemon reads
+commands from. The directory will also contain files named
+"shm-index-<SHA1>". These are used as backing stores for shared
+memory. Normally the daemon will clean up these files when it exits
+or when they are no longer relevant. But if it crashes, some objects
+could remain there and they can be safely deleted with "rm"
+command. The following commands are used to control the daemon:
+
+"refresh"::
+ Reread the index.
+
+"poke":
+ Let the daemon know the index is to be read. It keeps the
+ daemon alive longer, unless `--exit-after=0` is used.
+
+All commands and replies are terminated by a 0 byte.
+
+GIT
+---
+Part of the linkgit:git[1] suite
diff --git a/Makefile b/Makefile
index 2742a69..c8be0e7 100644
--- a/Makefile
+++ b/Makefile
@@ -1433,6 +1433,10 @@ ifdef HAVE_DEV_TTY
BASIC_CFLAGS += -DHAVE_DEV_TTY
endif
+ifndef NO_MMAP
+ PROGRAM_OBJS += index-helper.o
+endif
+
ifdef DIR_HAS_BSD_GROUP_SEMANTICS
COMPAT_CFLAGS += -DDIR_HAS_BSD_GROUP_SEMANTICS
endif
@@ -2159,6 +2163,7 @@ GIT-BUILD-OPTIONS: FORCE
@echo NO_PERL=\''$(subst ','\'',$(subst ','\'',$(NO_PERL)))'\' >>$@+
@echo NO_PYTHON=\''$(subst ','\'',$(subst ','\'',$(NO_PYTHON)))'\' >>$@+
@echo NO_UNIX_SOCKETS=\''$(subst ','\'',$(subst ','\'',$(NO_UNIX_SOCKETS)))'\' >>$@+
+ @echo NO_MMAP=\''$(subst ','\'',$(subst ','\'',$(NO_MMAP)))'\' >>$@+
ifdef TEST_OUTPUT_DIRECTORY
@echo TEST_OUTPUT_DIRECTORY=\''$(subst ','\'',$(subst ','\'',$(TEST_OUTPUT_DIRECTORY)))'\' >>$@+
endif
diff --git a/cache.h b/cache.h
index 4180e2b..43fb314 100644
--- a/cache.h
+++ b/cache.h
@@ -334,6 +334,8 @@ struct index_state {
struct cache_time timestamp;
unsigned name_hash_initialized : 1,
keep_mmap : 1,
+ from_shm : 1,
+ to_shm : 1,
initialized : 1;
struct hashmap name_hash;
struct hashmap dir_hash;
diff --git a/git-compat-util.h b/git-compat-util.h
index c07e0c1..56945a7 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -513,6 +513,7 @@ static inline int ends_with(const char *str, const char *suffix)
#define PROT_READ 1
#define PROT_WRITE 2
#define MAP_PRIVATE 1
+#define MAP_SHARED 2
#endif
#define mmap git_mmap
diff --git a/index-helper.c b/index-helper.c
new file mode 100644
index 0000000..976e913
--- /dev/null
+++ b/index-helper.c
@@ -0,0 +1,285 @@
+#include "cache.h"
+#include "parse-options.h"
+#include "sigchain.h"
+#include "strbuf.h"
+#include "exec_cmd.h"
+#include "split-index.h"
+#include "lockfile.h"
+#include "cache.h"
+#include "unix-socket.h"
+#include "pkt-line.h"
+
+struct shm {
+ unsigned char sha1[20];
+ void *shm;
+ size_t size;
+};
+
+static struct shm shm_index;
+static struct shm shm_base_index;
+
+static void release_index_shm(struct shm *is)
+{
+ if (!is->shm)
+ return;
+ munmap(is->shm, is->size);
+ unlink(git_path("shm-index-%s", sha1_to_hex(is->sha1)));
+ is->shm = NULL;
+}
+
+static void cleanup_shm(void)
+{
+ release_index_shm(&shm_index);
+ release_index_shm(&shm_base_index);
+}
+
+static void cleanup(void)
+{
+ unlink(git_path("index-helper.sock"));
+ cleanup_shm();
+}
+
+static void cleanup_on_signal(int sig)
+{
+ /* We ignore sigpipes -- that's just a client being broken. */
+ if (sig == SIGPIPE)
+ return;
+ cleanup();
+ sigchain_pop(sig);
+ raise(sig);
+}
+
+static int shared_mmap_create(int file_flags, int file_mode, size_t size,
+ void **new_mmap, int mmap_prot, int mmap_flags,
+ const char *path)
+{
+ int fd = -1;
+ int ret = -1;
+
+ fd = open(path, file_flags, file_mode);
+
+ if (fd < 0)
+ goto done;
+
+ if (ftruncate(fd, size))
+ goto done;
+
+ *new_mmap = mmap(NULL, size, mmap_prot, mmap_flags, fd, 0);
+
+ if (*new_mmap == MAP_FAILED) {
+ *new_mmap = NULL;
+ goto done;
+ }
+ madvise(new_mmap, size, MADV_WILLNEED);
+
+ ret = 0;
+done:
+ if (fd > 0)
+ close(fd);
+ return ret;
+}
+
+static void share_index(struct index_state *istate, struct shm *is)
+{
+ void *new_mmap;
+ if (istate->mmap_size <= 20 ||
+ hashcmp(istate->sha1,
+ (unsigned char *)istate->mmap + istate->mmap_size - 20) ||
+ !hashcmp(istate->sha1, is->sha1) ||
+ shared_mmap_create(O_CREAT | O_EXCL | O_RDWR, 0700,
+ istate->mmap_size, &new_mmap,
+ PROT_READ | PROT_WRITE, MAP_SHARED,
+ git_path("shm-index-%s",
+ sha1_to_hex(istate->sha1))) < 0)
+ return;
+
+ release_index_shm(is);
+ is->size = istate->mmap_size;
+ is->shm = new_mmap;
+ hashcpy(is->sha1, istate->sha1);
+
+ memcpy(new_mmap, istate->mmap, istate->mmap_size - 20);
+
+ /*
+ * The trailing hash must be written last after everything is
+ * written. It's the indication that the shared memory is now
+ * ready.
+ * The memory barrier here matches read-cache.c:try_shm.
+ */
+ __sync_synchronize();
+
+ hashcpy((unsigned char *)new_mmap + istate->mmap_size - 20, is->sha1);
+}
+
+static void share_the_index(void)
+{
+ if (the_index.split_index && the_index.split_index->base)
+ share_index(the_index.split_index->base, &shm_base_index);
+ share_index(&the_index, &shm_index);
+ discard_index(&the_index);
+}
+
+static void set_socket_blocking_flag(int fd, int make_nonblocking)
+{
+ int flags;
+
+ flags = fcntl(fd, F_GETFL, NULL);
+
+ if (flags < 0)
+ die(_("fcntl failed"));
+
+ if (make_nonblocking)
+ flags |= O_NONBLOCK;
+ else
+ flags &= ~O_NONBLOCK;
+
+ if (fcntl(fd, F_SETFL, flags) < 0)
+ die(_("fcntl failed"));
+}
+
+static void refresh(void)
+{
+ discard_index(&the_index);
+ the_index.keep_mmap = 1;
+ the_index.to_shm = 1;
+ if (read_cache() < 0)
+ die(_("could not read index"));
+ share_the_index();
+}
+
+#ifndef NO_MMAP
+
+static void loop(int fd, int idle_in_seconds)
+{
+ struct timeval timeout;
+ struct timeval *timeout_p;
+
+ while (1) {
+ fd_set readfds;
+ int result, client_fd;
+ int flags;
+ char buf[4096];
+ int bytes_read;
+
+ /* need to reset timer in case select() decremented it */
+ if (idle_in_seconds) {
+ timeout.tv_usec = 0;
+ timeout.tv_sec = idle_in_seconds;
+ timeout_p = &timeout;
+ } else {
+ timeout_p = NULL;
+ }
+
+ /* Wait for a request */
+ FD_ZERO(&readfds);
+ FD_SET(fd, &readfds);
+ result = select(fd + 1, &readfds, NULL, NULL, timeout_p);
+ if (result < 0) {
+ if (errno == EINTR)
+ /*
+ * This can lead to an overlong keepalive,
+ * but that is better than a premature exit.
+ */
+ continue;
+ die_errno(_("select() failed"));
+ }
+ if (result == 0)
+ /* timeout */
+ break;
+
+ client_fd = accept(fd, NULL, NULL);
+ if (client_fd < 0)
+ /*
+ * An error here is unlikely -- it probably
+ * indicates that the connecting process has
+ * already dropped the connection.
+ */
+ continue;
+
+ /*
+ * Our connection to the client is blocking since a client
+ * can always be killed by SIGINT or similar.
+ */
+ set_socket_blocking_flag(client_fd, 0);
+
+ flags = PACKET_READ_GENTLE_ON_EOF | PACKET_READ_CHOMP_NEWLINE;
+ bytes_read = packet_read(client_fd, NULL, NULL, buf,
+ sizeof(buf), flags);
+
+ if (bytes_read > 0) {
+ /* ensure string termination */
+ buf[bytes_read] = 0;
+ if (!strcmp(buf, "refresh")) {
+ refresh();
+ } else if (!strcmp(buf, "poke")) {
+ /*
+ * Just a poke to keep us
+ * alive, nothing to do.
+ */
+ } else {
+ warning("BUG: Bogus command %s", buf);
+ }
+ } else {
+ /*
+ * No command from client. Probably it's just
+ * a liveness check or client error. Just
+ * close up.
+ */
+ }
+ close(client_fd);
+ }
+
+ close(fd);
+}
+
+#else
+
+static void loop(int fd, int idle_in_seconds)
+{
+ die(_("index-helper is not supported on this platform"));
+}
+
+#endif
+
+static const char * const usage_text[] = {
+ N_("git index-helper [options]"),
+ NULL
+};
+
+int main(int argc, char **argv)
+{
+ const char *prefix;
+ int idle_in_seconds = 600;
+ int fd;
+ struct strbuf socket_path = STRBUF_INIT;
+ struct option options[] = {
+ OPT_INTEGER(0, "exit-after", &idle_in_seconds,
+ N_("exit if not used after some seconds")),
+ OPT_END()
+ };
+
+ git_extract_argv0_path(argv[0]);
+ git_setup_gettext();
+
+ if (argc == 2 && !strcmp(argv[1], "-h"))
+ usage_with_options(usage_text, options);
+
+ prefix = setup_git_directory();
+ if (parse_options(argc, (const char **)argv, prefix,
+ options, usage_text, 0))
+ die(_("too many arguments"));
+
+ atexit(cleanup);
+ sigchain_push_common(cleanup_on_signal);
+
+ strbuf_git_path(&socket_path, "index-helper.sock");
+
+ fd = unix_stream_listen(socket_path.buf);
+ if (fd < 0)
+ die_errno(_("could not set up index-helper socket"));
+
+ loop(fd, idle_in_seconds);
+
+ close(fd);
+ return 0;
+}
diff --git a/read-cache.c b/read-cache.c
index 3cb0ec3..81dfb4e 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -18,6 +18,8 @@
#include "varint.h"
#include "split-index.h"
#include "utf8.h"
+#include "unix-socket.h"
+#include "pkt-line.h"
static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
unsigned int options);
@@ -1541,6 +1543,96 @@ static void post_read_index_from(struct index_state *istate)
tweak_untracked_cache(istate);
}
+static int poke_daemon(struct index_state *istate,
+ const struct stat *st, int refresh_cache)
+{
+ int fd;
+ int ret = 0;
+ const char *socket_path;
+
+ /* if this is from index-helper, do not poke itself (recursively) */
+ if (istate->to_shm)
+ return 0;
+
+ socket_path = git_path("index-helper.sock");
+ if (!socket_path)
+ return -1;
+
+ fd = unix_stream_connect(socket_path);
+ if (refresh_cache) {
+ packet_write(fd, "refresh");
+ } else {
+ packet_write(fd, "poke");
+ }
+ packet_flush(fd);
+
+ close(fd);
+ return ret;
+}
+
+static int is_main_index(struct index_state *istate)
+{
+ return istate == &the_index ||
+ (the_index.split_index &&
+ istate == the_index.split_index->base);
+}
+
+/*
+ * Try to open and verify a cached shm index if available. Return 0 if
+ * succeeds (istate->mmap and istate->mmap_size are updated). Return
+ * negative otherwise.
+ */
+static int try_shm(struct index_state *istate)
+{
+ void *new_mmap = NULL;
+ size_t old_size = istate->mmap_size;
+ ssize_t new_size;
+ const unsigned char *sha1;
+ struct stat st;
+ int fd = -1;
+
+ if (!is_main_index(istate) ||
+ old_size <= 20 ||
+ stat(git_path("index-helper.sock"), &st))
+ return -1;
+ if (poke_daemon(istate, &st, 0))
+ return -1;
+ sha1 = (unsigned char *)istate->mmap + old_size - 20;
+
+ fd = open(git_path("shm-index-%s", sha1_to_hex(sha1)), O_RDONLY);
+ if (fd < 0)
+ goto fail;
+
+ if (fstat(fd, &st))
+ goto fail;
+
+ new_size = st.st_size;
+ new_mmap = mmap(NULL, new_size, PROT_READ, MAP_SHARED, fd, 0);
+ if (new_size <= 20 ||
+ hashcmp((unsigned char *)istate->mmap + old_size - 20,
+ (unsigned char *)new_mmap + new_size - 20)) {
+ if (new_mmap)
+ munmap(new_mmap, new_size);
+ goto fail;
+ }
+
+ /* The memory barrier here matches index-helper.c:share_index. */
+ __sync_synchronize();
+
+ munmap(istate->mmap, istate->mmap_size);
+ istate->mmap = new_mmap;
+ istate->mmap_size = new_size;
+ istate->from_shm = 1;
+ close(fd);
+ return 0;
+
+fail:
+ if (fd >= 0)
+ close(fd);
+ poke_daemon(istate, &st, 1);
+ return -1;
+}
+
/* remember to discard_cache() before reading a different cache! */
int do_read_index(struct index_state *istate, const char *path, int must_exist)
{
@@ -1555,6 +1647,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
if (istate->initialized)
return istate->cache_nr;
+ istate->from_shm = 0;
istate->timestamp.sec = 0;
istate->timestamp.nsec = 0;
fd = open(path, O_RDONLY);
@@ -1574,15 +1667,17 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (mmap == MAP_FAILED)
die_errno("unable to map index file");
- if (istate->keep_mmap) {
- istate->mmap = mmap;
- istate->mmap_size = mmap_size;
- }
close(fd);
- hdr = mmap;
- if (verify_hdr(hdr, mmap_size) < 0)
+ istate->mmap = mmap;
+ istate->mmap_size = mmap_size;
+ if (try_shm(istate) &&
+ verify_hdr(istate->mmap, istate->mmap_size) < 0)
goto unmap;
+ hdr = mmap = istate->mmap;
+ mmap_size = istate->mmap_size;
+ if (!istate->keep_mmap)
+ istate->mmap = NULL;
hashcpy(istate->sha1, (const unsigned char *)hdr + mmap_size - 20);
istate->version = ntohl(hdr->hdr_version);
@@ -1662,6 +1757,8 @@ int read_index_from(struct index_state *istate, const char *path)
else
split_index->base = xcalloc(1, sizeof(*split_index->base));
split_index->base->keep_mmap = istate->keep_mmap;
+ split_index->base->to_shm = istate->to_shm;
+ split_index->base->from_shm = istate->from_shm;
ret = do_read_index(split_index->base,
git_path("sharedindex.%s",
sha1_to_hex(split_index->base_sha1)), 1);
@@ -1712,6 +1809,8 @@ int discard_index(struct index_state *istate)
discard_split_index(istate);
free_untracked_cache(istate->untracked);
istate->untracked = NULL;
+ istate->from_shm = 0;
+ istate->to_shm = 0;
return 0;
}
@@ -2138,9 +2237,14 @@ static int do_write_locked_index(struct index_state *istate, struct lock_file *l
return ret;
assert((flags & (COMMIT_LOCK | CLOSE_LOCK)) !=
(COMMIT_LOCK | CLOSE_LOCK));
- if (flags & COMMIT_LOCK)
- return commit_locked_index(lock);
- else if (flags & CLOSE_LOCK)
+ if (flags & COMMIT_LOCK) {
+ struct stat st;
+ ret = commit_locked_index(lock);
+ if (!ret && is_main_index(istate) &&
+ !stat(git_path("index-helper.sock"), &st))
+ poke_daemon(istate, &st, 1);
+ return ret;
+ } else if (flags & CLOSE_LOCK)
return close_lock_file(lock);
else
return ret;
diff --git a/t/t7900-index-helper.sh b/t/t7900-index-helper.sh
new file mode 100755
index 0000000..114c112
--- /dev/null
+++ b/t/t7900-index-helper.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+#
+# Copyright (c) 2016, Twitter, Inc
+#
+
+test_description='git-index-helper
+
+Testing git index-helper
+'
+
+. ./test-lib.sh
+
+test -n "$NO_MMAP" && {
+ skip_all='skipping index-helper tests: no mmap'
+ test_done
+}
+
+test_expect_success 'index-helper smoke test' '
+ git index-helper --exit-after 1 &&
+ test_path_is_missing .git/index-helper.sock
+'
+
+test_done
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* Re: [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff
2016-04-27 20:04 ` [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff David Turner
@ 2016-04-28 18:58 ` Junio C Hamano
2016-04-29 18:46 ` David Turner
0 siblings, 1 reply; 24+ messages in thread
From: Junio C Hamano @ 2016-04-28 18:58 UTC (permalink / raw)
To: David Turner; +Cc: git, pclouds, Ramsay Jones
David Turner <dturner@twopensource.com> writes:
> From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ...
> The biggest gain is not having to verify the trailing SHA-1, which
> takes lots of time especially on large index files. But this also
> opens doors for further optimiztions:
optimizAtion
> Git can poke the daemon via unix domain sockets to tell it to refresh
> the index cache, or to keep it alive some more minutes. It can't give
> any real index data directly to the daemon. Real data goes to disk
> first, then the daemon reads and verifies it from there. Poking only
> happens for $GIT_DIR/index, not temporary index files.
Is this limited to "poking", or the helper daemon is not involved in
codepaths that handle temporary index at all? It makes sense if it
is the latter, and it doesn't if it were the former, but it is
unclear in this paragraph.
> $GIT_DIR/index-helper.sock is the socket for the daemon process. The
> daemon reads from the socket and executes commands.
>
> Named pipes were considered for portability reasons, but then commands
> that need replies from the daemon would have open their own pipes,
"would have TO open"?
> since a named pipe should only have one reader. Unix domain sockets
> don't have this problem.
> diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
> new file mode 100644
> index 0000000..77687c0
> --- /dev/null
> +++ b/Documentation/git-index-helper.txt
> @@ -0,0 +1,47 @@
> +git-index-helper(1)
> +===================
> +
> +NAME
> +----
> +git-index-helper - A simple cache daemon for speeding up index file access
> +
> +SYNOPSIS
> +--------
> +[verse]
> +'git index-helper' [options]
> +
> +DESCRIPTION
> +-----------
> +Keep the index file in memory for faster access. This daemon is per
> +repository.
Not an objection but a question. Does this mean "per index file"?
What the users would need to be aware of is that it is not like
running a single daemon instance helps the toplevel project with its
entire 600 submodules checked out you have--you would need that many
instances of the helper, which is already conveyed well with "per
repository". But I was wondering if it helps users experimenting
with the multiple worktree feature if we said "per index file". It
would make it more clear that you would run two instances of the
helper daemon when you use another worktree in addition to your
primary repository.
> +... The following commands are used to control the daemon:
> +
> +"refresh"::
> + Reread the index.
> +
> +"poke":
> + Let the daemon know the index is to be read. It keeps the
> + daemon alive longer, unless `--exit-after=0` is used.
> +
> +All commands and replies are terminated by a 0 byte.
s/0/NUL/
> diff --git a/cache.h b/cache.h
> index 4180e2b..43fb314 100644
> --- a/cache.h
> +++ b/cache.h
> @@ -334,6 +334,8 @@ struct index_state {
> struct cache_time timestamp;
> unsigned name_hash_initialized : 1,
> keep_mmap : 1,
> + from_shm : 1,
> + to_shm : 1,
keep_mmap bit had its own commit, which made it more-or-less
unnecessary to have a separate explanation, but it is unclear how
these two bits are envisioned to be used...
> diff --git a/index-helper.c b/index-helper.c
> new file mode 100644
> index 0000000..976e913
> --- /dev/null
> +++ b/index-helper.c
> @@ -0,0 +1,285 @@
> +#include "cache.h"
> +#include "parse-options.h"
> +#include "sigchain.h"
> +#include "strbuf.h"
> +#include "exec_cmd.h"
> +#include "split-index.h"
> +#include "lockfile.h"
> +#include "cache.h"
> +#include "unix-socket.h"
> +#include "pkt-line.h"
> +
> +struct shm {
> + unsigned char sha1[20];
> + void *shm;
> + size_t size;
> +};
> +
> +static struct shm shm_index;
> +static struct shm shm_base_index;
> +
> +static void release_index_shm(struct shm *is)
> +{
> + if (!is->shm)
> + return;
> + munmap(is->shm, is->size);
> + unlink(git_path("shm-index-%s", sha1_to_hex(is->sha1)));
> + is->shm = NULL;
> +}
> +
> +static void cleanup_shm(void)
> +{
> + release_index_shm(&shm_index);
> + release_index_shm(&shm_base_index);
> +}
> +
> +static void cleanup(void)
> +{
> + unlink(git_path("index-helper.sock"));
> + cleanup_shm();
> +}
> +
> +static void cleanup_on_signal(int sig)
> +{
> + /* We ignore sigpipes -- that's just a client being broken. */
Is it really "a broken" client, in which case we would want to know
about the breakage so that we can fix it? Or is it a case of "a
client wasn't interested in what we had to say, which is perfectly
fine"?
> + if (sig == SIGPIPE)
> + return;
> + cleanup();
> + sigchain_pop(sig);
> + raise(sig);
> +}
> +
> +static int shared_mmap_create(int file_flags, int file_mode, size_t size,
> + void **new_mmap, int mmap_prot, int mmap_flags,
> + const char *path)
> +{
I can understand size, new_mmap and path, but do all others need the
customizability? It is hard to tell at this point in the series as
there is only one caller, which gives a reasonable set of values to
these parameters. And each of all these "reasonable values" is the
only reasonable value for each of these parameters-- you would ever
want to have mmap_prot without PROT_WRIT as this is creating an
empty region that is mapped to a newly created file, for example.
It is inconceivable that a function named "shared_mmap_create" ever
passes mmap_flags that lack MAP_SHARED, for another example, or
file_flags that is not O_CREAT|O_EXCL|O_RDWR for that matter.
> + ...
> + if (ftruncate(fd, size))
> + goto done;
> + *new_mmap = mmap(NULL, size, mmap_prot, mmap_flags, fd, 0);
> ...
> +static void share_index(struct index_state *istate, struct shm *is)
> +{
> + void *new_mmap;
> + if (istate->mmap_size <= 20 ||
> + hashcmp(istate->sha1,
> + (unsigned char *)istate->mmap + istate->mmap_size - 20) ||
> + !hashcmp(istate->sha1, is->sha1) ||
> + shared_mmap_create(O_CREAT | O_EXCL | O_RDWR, 0700,
> + istate->mmap_size, &new_mmap,
> + PROT_READ | PROT_WRITE, MAP_SHARED,
> + git_path("shm-index-%s",
> + sha1_to_hex(istate->sha1))) < 0)
> + return;
> + release_index_shm(is);
> + is->size = istate->mmap_size;
> + is->shm = new_mmap;
> + hashcpy(is->sha1, istate->sha1);
So "is" is expected to be a valid instance of shm that was obtained
previously. When we fail to map and return, does it make sense to
retain it? Because this function does not return any value, the
caller wouldn't be able to tell that shared-mmap-create failed, and
will keep using that stale instance of "is"--I cannot tell if that
is OK in the caller of this thing or not from what I read so far in
this series...
> +static void refresh(void)
> +{
> + discard_index(&the_index);
> + the_index.keep_mmap = 1;
> + the_index.to_shm = 1;
Again, mysterious to_shm appears here...
> + /* Wait for a request */
> + FD_ZERO(&readfds);
> + FD_SET(fd, &readfds);
> + result = select(fd + 1, &readfds, NULL, NULL, timeout_p);
I admit that I am old fashioned and am more familiar with select(2)
than poll(2), but I think we try to avoid select(2) in new code.
^ permalink raw reply [flat|nested] 24+ messages in thread* Re: [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff
2016-04-28 18:58 ` Junio C Hamano
@ 2016-04-29 18:46 ` David Turner
2016-04-29 20:47 ` Junio C Hamano
2016-05-01 0:22 ` Duy Nguyen
0 siblings, 2 replies; 24+ messages in thread
From: David Turner @ 2016-04-29 18:46 UTC (permalink / raw)
To: Junio C Hamano; +Cc: git, pclouds, Ramsay Jones
On Thu, 2016-04-28 at 11:58 -0700, Junio C Hamano wrote:
> David Turner <dturner@twopensource.com> writes:
>
> > From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> > ...
> > The biggest gain is not having to verify the trailing SHA-1, which
> > takes lots of time especially on large index files. But this also
> > opens doors for further optimiztions:
>
> optimizAtion
>
> > Git can poke the daemon via unix domain sockets to tell it to
> > refresh
> > the index cache, or to keep it alive some more minutes. It can't
> > give
> > any real index data directly to the daemon. Real data goes to disk
> > first, then the daemon reads and verifies it from there. Poking
> > only
> > happens for $GIT_DIR/index, not temporary index files.
>
> Is this limited to "poking", or the helper daemon is not involved in
> codepaths that handle temporary index at all? It makes sense if it
> is the latter, and it doesn't if it were the former, but it is
> unclear in this paragraph.
It is in fact the latter. Will clarify.
> > $GIT_DIR/index-helper.sock is the socket for the daemon process.
> > The
> > daemon reads from the socket and executes commands.
> >
> > Named pipes were considered for portability reasons, but then
> > commands
> > that need replies from the daemon would have open their own pipes,
>
> "would have TO open"?
Oops.
> > since a named pipe should only have one reader. Unix domain
> > sockets
> > don't have this problem.
>
> > diff --git a/Documentation/git-index-helper.txt b/Documentation/git
> > -index-helper.txt
> > new file mode 100644
> > index 0000000..77687c0
> > --- /dev/null
> > +++ b/Documentation/git-index-helper.txt
> > @@ -0,0 +1,47 @@
> > +git-index-helper(1)
> > +===================
> > +
> > +NAME
> > +----
> > +git-index-helper - A simple cache daemon for speeding up index
> > file access
> > +
> > +SYNOPSIS
> > +--------
> > +[verse]
> > +'git index-helper' [options]
> > +
> > +DESCRIPTION
> > +-----------
> > +Keep the index file in memory for faster access. This daemon is
> > per
> > +repository.
>
> Not an objection but a question. Does this mean "per index file"?
>
> What the users would need to be aware of is that it is not like
> running a single daemon instance helps the toplevel project with its
> entire 600 submodules checked out you have--you would need that many
> instances of the helper, which is already conveyed well with "per
> repository". But I was wondering if it helps users experimenting
> with the multiple worktree feature if we said "per index file". It
> would make it more clear that you would run two instances of the
> helper daemon when you use another worktree in addition to your
> primary repository.
Per working tree/repository, yes (not quite per-index because working
trees with split indexes have two). But yeah, that's confusing; will
clarify.
> > +... The following commands are used to control the daemon:
> > +
> > +"refresh"::
> > + Reread the index.
> > +
> > +"poke":
> > + Let the daemon know the index is to be read. It keeps the
> > + daemon alive longer, unless `--exit-after=0` is used.
> > +
> > +All commands and replies are terminated by a 0 byte.
>
> s/0/NUL/
Will fix.
> > diff --git a/cache.h b/cache.h
> > index 4180e2b..43fb314 100644
> > --- a/cache.h
> > +++ b/cache.h
> > @@ -334,6 +334,8 @@ struct index_state {
> > struct cache_time timestamp;
> > unsigned name_hash_initialized : 1,
> > keep_mmap : 1,
> > + from_shm : 1,
> > + to_shm : 1,
>
> keep_mmap bit had its own commit, which made it more-or-less
> unnecessary to have a separate explanation, but it is unclear how
> these two bits are envisioned to be used...
Will add comments.
> > diff --git a/index-helper.c b/index-helper.c
> > new file mode 100644
> > index 0000000..976e913
> > --- /dev/null
> > +++ b/index-helper.c
> > @@ -0,0 +1,285 @@
> > +#include "cache.h"
> > +#include "parse-options.h"
> > +#include "sigchain.h"
> > +#include "strbuf.h"
> > +#include "exec_cmd.h"
> > +#include "split-index.h"
> > +#include "lockfile.h"
> > +#include "cache.h"
> > +#include "unix-socket.h"
> > +#include "pkt-line.h"
> > +
> > +struct shm {
> > + unsigned char sha1[20];
> > + void *shm;
> > + size_t size;
> > +};
> > +
> > +static struct shm shm_index;
> > +static struct shm shm_base_index;
> > +
> > +static void release_index_shm(struct shm *is)
> > +{
> > + if (!is->shm)
> > + return;
> > + munmap(is->shm, is->size);
> > + unlink(git_path("shm-index-%s", sha1_to_hex(is->sha1)));
> > + is->shm = NULL;
> > +}
> > +
> > +static void cleanup_shm(void)
> > +{
> > + release_index_shm(&shm_index);
> > + release_index_shm(&shm_base_index);
> > +}
> > +
> > +static void cleanup(void)
> > +{
> > + unlink(git_path("index-helper.sock"));
> > + cleanup_shm();
> > +}
> > +
> > +static void cleanup_on_signal(int sig)
> > +{
> > + /* We ignore sigpipes -- that's just a client being
> > broken. */
>
> Is it really "a broken" client, in which case we would want to know
> about the breakage so that we can fix it? Or is it a case of "a
> client wasn't interested in what we had to say, which is perfectly
> fine"?
It's usually a client that's killed at an inopportune moment e.g.:
git diff
^C
#oops I meant
git diff --cached
I guess I'll reword to "suddenly dying".
> > + if (sig == SIGPIPE)
> > + return;
> > + cleanup();
> > + sigchain_pop(sig);
> > + raise(sig);
> > +}
> > +
> > +static int shared_mmap_create(int file_flags, int file_mode,
> > size_t size,
> > + void **new_mmap, int mmap_prot, int
> > mmap_flags,
> > + const char *path)
> > +{
>
> I can understand size, new_mmap and path, but do all others need the
> customizability? It is hard to tell at this point in the series as
> there is only one caller, which gives a reasonable set of values to
> these parameters. And each of all these "reasonable values" is the
> only reasonable value for each of these parameters-- you would ever
> want to have mmap_prot without PROT_WRIT as this is creating an
> empty region that is mapped to a newly created file, for example.
> It is inconceivable that a function named "shared_mmap_create" ever
> passes mmap_flags that lack MAP_SHARED, for another example, or
> file_flags that is not O_CREAT|O_EXCL|O_RDWR for that matter.
Yeah, good point.
> > + ...
> > + if (ftruncate(fd, size))
> > + goto done;
> > + *new_mmap = mmap(NULL, size, mmap_prot, mmap_flags, fd,
> > 0);
> > ...
> > +static void share_index(struct index_state *istate, struct shm
> > *is)
> > +{
> > + void *new_mmap;
> > + if (istate->mmap_size <= 20 ||
> > + hashcmp(istate->sha1,
> > + (unsigned char *)istate->mmap + istate
> > ->mmap_size - 20) ||
> > + !hashcmp(istate->sha1, is->sha1) ||
> > + shared_mmap_create(O_CREAT | O_EXCL | O_RDWR, 0700,
> > + istate->mmap_size, &new_mmap,
> > + PROT_READ | PROT_WRITE, MAP_SHARED,
> > + git_path("shm-index-%s",
> > + sha1_to_hex(istate
> > ->sha1))) < 0)
> > + return;
> > + release_index_shm(is);
> > + is->size = istate->mmap_size;
> > + is->shm = new_mmap;
> > + hashcpy(is->sha1, istate->sha1);
>
> So "is" is expected to be a valid instance of shm that was obtained
> previously. When we fail to map and return, does it make sense to
> retain it? Because this function does not return any value, the
> caller wouldn't be able to tell that shared-mmap-create failed, and
> will keep using that stale instance of "is"--I cannot tell if that
> is OK in the caller of this thing or not from what I read so far in
> this series...
Honestly, if we fail to mmap, we should probably just die. That's not
a normal circumstance, and there's not much point in keeping a non
-functioning index-helper around.
> > +static void refresh(void)
> > +{
> > + discard_index(&the_index);
> > + the_index.keep_mmap = 1;
> > + the_index.to_shm = 1;
>
> Again, mysterious to_shm appears here...
I expect that the explanation of to_shm will help here.
> > + /* Wait for a request */
> > + FD_ZERO(&readfds);
> > + FD_SET(fd, &readfds);
> > + result = select(fd + 1, &readfds, NULL, NULL,
> > timeout_p);
>
> I admit that I am old fashioned and am more familiar with select(2)
> than poll(2), but I think we try to avoid select(2) in new code.
I don't see that in Documentation/CodingGuidelines (although I admit
that I did not even consider checking it before writing this code, so
if it had been there, I would have missed it).
Why do we try to avoid select(2)? It seems marginally less efficient
for small numbers of fds, and might not scale to large numbers of fds,
but we're not using it in a performance-critical way, and we only care
about one fd at a time.
^ permalink raw reply [flat|nested] 24+ messages in thread* Re: [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff
2016-04-29 18:46 ` David Turner
@ 2016-04-29 20:47 ` Junio C Hamano
2016-05-01 0:22 ` Duy Nguyen
1 sibling, 0 replies; 24+ messages in thread
From: Junio C Hamano @ 2016-04-29 20:47 UTC (permalink / raw)
To: David Turner; +Cc: git, pclouds, Ramsay Jones
David Turner <dturner@twopensource.com> writes:
> Per working tree/repository, yes (not quite per-index because working
> trees with split indexes have two).
Heh, I consider "split index" merely an implementation detail of a
(logical) single index file that happens to be represented with two
physical files.
Anyway, thanks for clarification.
> Why do we try to avoid select(2)? It seems marginally less efficient
> for small numbers of fds, and might not scale to large numbers of fds,
> but we're not using it in a performance-critical way, and we only care
> about one fd at a time.
Just that having to deal with two APIs that do very similar things
is less preferrable than just using one that was designed later by
those who learned lessons while using the older one.
^ permalink raw reply [flat|nested] 24+ messages in thread
* Re: [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff
2016-04-29 18:46 ` David Turner
2016-04-29 20:47 ` Junio C Hamano
@ 2016-05-01 0:22 ` Duy Nguyen
1 sibling, 0 replies; 24+ messages in thread
From: Duy Nguyen @ 2016-05-01 0:22 UTC (permalink / raw)
To: David Turner; +Cc: Junio C Hamano, Git Mailing List, Ramsay Jones
On Sat, Apr 30, 2016 at 1:46 AM, David Turner <dturner@twopensource.com> wrote:
> On Thu, 2016-04-28 at 11:58 -0700, Junio C Hamano wrote:
>> David Turner <dturner@twopensource.com> writes:
>>
>> > From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
>> > ...
>> > The biggest gain is not having to verify the trailing SHA-1, which
>> > takes lots of time especially on large index files. But this also
>> > opens doors for further optimiztions:
>>
>> optimizAtion
>>
>> > Git can poke the daemon via unix domain sockets to tell it to
>> > refresh
>> > the index cache, or to keep it alive some more minutes. It can't
>> > give
>> > any real index data directly to the daemon. Real data goes to disk
>> > first, then the daemon reads and verifies it from there. Poking
>> > only
>> > happens for $GIT_DIR/index, not temporary index files.
>>
>> Is this limited to "poking", or the helper daemon is not involved in
>> codepaths that handle temporary index at all? It makes sense if it
>> is the latter, and it doesn't if it were the former, but it is
>> unclear in this paragraph.
>
> It is in fact the latter. Will clarify.
The intention is so. The execution is less than perfect. On the server
side, the index-helper only concerns itself with .git/index only.
Good. On the client side, is_main_index() is used to detect if it's
$GIT_DIR/index. It checks if the given index_state pointer points to
the_index and if so assumes that it is the main index.
That is not true when read_cache_from() is used with something other
than git_index_file() as argument. Which is exactly what
builtin/commit.c does in prepare_index(). .git/index.lock gets passed
in instead. read-cache.c may "poke" or "refresh" (probably should
rename these to "read" and "write") because is_main_index()
incorrectly returns true. Luckily it will soon find out index-helper
does not prepare shm for this particular index file and fall back to
reading from disk. We waste some context switches though.
--
Duy
^ permalink raw reply [flat|nested] 24+ messages in thread
* [PATCH v6 04/19] index-helper: add --strict
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (2 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 03/19] index-helper: new daemon for caching index and related stuff David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 05/19] index-helper: log warnings David Turner
` (14 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
There are "holes" in the index-helper approach because the shared
memory is not verified again by git. If $USER is compromised, shared
memory could be modified. But anyone who could do this could already
modify $GIT_DIR/index. A more realistic risk is some bugs in
index-helper that produce corrupt shared memory. --strict is added to
avoid that.
Strictly speaking there's still a very small gap where corrupt shared
memory could still be read by git: after we write the trailing SHA-1 in
the shared memory (thus signaling "this shm is ready") and before
verify_shm() detects an error.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 9 +++++++
cache.h | 1 +
index-helper.c | 48 ++++++++++++++++++++++++++++++++++++++
read-cache.c | 9 ++++---
4 files changed, 64 insertions(+), 3 deletions(-)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index 77687c0..a5c058f 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -22,6 +22,15 @@ OPTIONS
Exit if the cached index is not accessed for `<n>`
seconds. Specify 0 to wait forever. Default is 600.
+--strict::
+--no-strict::
+ Strict mode makes index-helper verify the shared memory after
+ it's created. If the result does not match what's read from
+ $GIT_DIR/index, the shared memory is destroyed. This makes
+ index-helper take more than double the amount of time required
+ for reading an index, but because it will happen in the
+ background, it's not noticable. `--strict` is enabled by default.
+
NOTES
-----
diff --git a/cache.h b/cache.h
index 43fb314..4b678e9 100644
--- a/cache.h
+++ b/cache.h
@@ -336,6 +336,7 @@ struct index_state {
keep_mmap : 1,
from_shm : 1,
to_shm : 1,
+ always_verify_trailing_sha1 : 1,
initialized : 1;
struct hashmap name_hash;
struct hashmap dir_hash;
diff --git a/index-helper.c b/index-helper.c
index 976e913..5cadd0d 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -17,6 +17,7 @@ struct shm {
static struct shm shm_index;
static struct shm shm_base_index;
+static int to_verify = 1;
static void release_index_shm(struct shm *is)
{
@@ -111,11 +112,56 @@ static void share_index(struct index_state *istate, struct shm *is)
hashcpy((unsigned char *)new_mmap + istate->mmap_size - 20, is->sha1);
}
+static int verify_shm(void)
+{
+ int i;
+ struct index_state istate;
+ memset(&istate, 0, sizeof(istate));
+ istate.always_verify_trailing_sha1 = 1;
+ istate.to_shm = 1;
+ i = read_index(&istate);
+ if (i != the_index.cache_nr)
+ goto done;
+ for (; i < the_index.cache_nr; i++) {
+ struct cache_entry *base, *ce;
+ /* namelen is checked separately */
+ const unsigned int ondisk_flags =
+ CE_STAGEMASK | CE_VALID | CE_EXTENDED_FLAGS;
+ unsigned int ce_flags, base_flags, ret;
+ base = the_index.cache[i];
+ ce = istate.cache[i];
+ if (ce->ce_namelen != base->ce_namelen ||
+ strcmp(ce->name, base->name)) {
+ warning("mismatch at entry %d", i);
+ break;
+ }
+ ce_flags = ce->ce_flags;
+ base_flags = base->ce_flags;
+ /* only on-disk flags matter */
+ ce->ce_flags &= ondisk_flags;
+ base->ce_flags &= ondisk_flags;
+ ret = memcmp(&ce->ce_stat_data, &base->ce_stat_data,
+ offsetof(struct cache_entry, name) -
+ offsetof(struct cache_entry, ce_stat_data));
+ ce->ce_flags = ce_flags;
+ base->ce_flags = base_flags;
+ if (ret) {
+ warning("mismatch at entry %d", i);
+ break;
+ }
+ }
+done:
+ discard_index(&istate);
+ return i == the_index.cache_nr;
+}
+
static void share_the_index(void)
{
if (the_index.split_index && the_index.split_index->base)
share_index(the_index.split_index->base, &shm_base_index);
share_index(&the_index, &shm_index);
+ if (to_verify && !verify_shm())
+ cleanup_shm();
discard_index(&the_index);
}
@@ -255,6 +301,8 @@ int main(int argc, char **argv)
struct option options[] = {
OPT_INTEGER(0, "exit-after", &idle_in_seconds,
N_("exit if not used after some seconds")),
+ OPT_BOOL(0, "strict", &to_verify,
+ "verify shared memory after creating"),
OPT_END()
};
diff --git a/read-cache.c b/read-cache.c
index 81dfb4e..9eedf03 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1671,9 +1671,12 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
istate->mmap = mmap;
istate->mmap_size = mmap_size;
- if (try_shm(istate) &&
- verify_hdr(istate->mmap, istate->mmap_size) < 0)
- goto unmap;
+ if (try_shm(istate)) {
+ if (verify_hdr(istate->mmap, istate->mmap_size) < 0)
+ goto unmap;
+ } else if (istate->always_verify_trailing_sha1 &&
+ verify_hdr(istate->mmap, istate->mmap_size) < 0)
+ goto unmap;
hdr = mmap = istate->mmap;
mmap_size = istate->mmap_size;
if (!istate->keep_mmap)
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 05/19] index-helper: log warnings
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (3 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 04/19] index-helper: add --strict David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 06/19] daemonize(): set a flag before exiting the main process David Turner
` (13 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Instead of writing warnings to stderr, write them to a log. Later, we'll
probably be daemonized, so writing to stderr will be pointless.
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 3 +++
index-helper.c | 29 ++++++++++++++++++++++++++---
2 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index a5c058f..4eb3d95 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -51,6 +51,9 @@ command. The following commands are used to control the daemon:
All commands and replies are terminated by a 0 byte.
+In the event of an error, messages may be written to
+$GIT_DIR/index-helper.log.
+
GIT
---
Part of the linkgit:git[1] suite
diff --git a/index-helper.c b/index-helper.c
index 5cadd0d..7400d68 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -19,6 +19,29 @@ static struct shm shm_index;
static struct shm shm_base_index;
static int to_verify = 1;
+static void log_warning(const char *warning, ...)
+{
+ va_list ap;
+ FILE *fp;
+
+ fp = fopen(git_path("index-helper.log"), "a");
+ if (!fp)
+ /*
+ * Probably nobody will see this, but it's the best
+ * we can do.
+ */
+ die("Failed to open log for warnings");
+
+ fprintf(fp, "%"PRIuMAX"\t", (uintmax_t)time(NULL));
+
+ va_start(ap, warning);
+ vfprintf(fp, warning, ap);
+ va_end(ap);
+
+ fputc('\n', fp);
+ fclose(fp);
+}
+
static void release_index_shm(struct shm *is)
{
if (!is->shm)
@@ -132,7 +155,7 @@ static int verify_shm(void)
ce = istate.cache[i];
if (ce->ce_namelen != base->ce_namelen ||
strcmp(ce->name, base->name)) {
- warning("mismatch at entry %d", i);
+ log_warning("mismatch at entry %d", i);
break;
}
ce_flags = ce->ce_flags;
@@ -146,7 +169,7 @@ static int verify_shm(void)
ce->ce_flags = ce_flags;
base->ce_flags = base_flags;
if (ret) {
- warning("mismatch at entry %d", i);
+ log_warning("mismatch at entry %d", i);
break;
}
}
@@ -263,7 +286,7 @@ static void loop(int fd, int idle_in_seconds)
* alive, nothing to do.
*/
} else {
- warning("BUG: Bogus command %s", buf);
+ log_warning("BUG: Bogus command %s", buf);
}
} else {
/*
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 06/19] daemonize(): set a flag before exiting the main process
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (4 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 05/19] index-helper: log warnings David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 07/19] index-helper: add --detach David Turner
` (12 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
This allows signal handlers and atexit functions to realize this
situation and not clean up.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
builtin/gc.c | 2 +-
cache.h | 2 +-
daemon.c | 2 +-
setup.c | 4 +++-
4 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/builtin/gc.c b/builtin/gc.c
index c583aad..37180de 100644
--- a/builtin/gc.c
+++ b/builtin/gc.c
@@ -385,7 +385,7 @@ int cmd_gc(int argc, const char **argv, const char *prefix)
* failure to daemonize is ok, we'll continue
* in foreground
*/
- daemonized = !daemonize();
+ daemonized = !daemonize(NULL);
}
} else
add_repack_all_option();
diff --git a/cache.h b/cache.h
index 4b678e9..0aeb994 100644
--- a/cache.h
+++ b/cache.h
@@ -530,7 +530,7 @@ extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
extern int init_db(const char *template_dir, unsigned int flags);
extern void sanitize_stdfds(void);
-extern int daemonize(void);
+extern int daemonize(int *);
#define alloc_nr(x) (((x)+16)*3/2)
diff --git a/daemon.c b/daemon.c
index 8d45c33..a5cf954 100644
--- a/daemon.c
+++ b/daemon.c
@@ -1365,7 +1365,7 @@ int main(int argc, char **argv)
return execute();
if (detach) {
- if (daemonize())
+ if (daemonize(NULL))
die("--detach not supported on this platform");
} else
sanitize_stdfds();
diff --git a/setup.c b/setup.c
index de1a2a7..9adf13f 100644
--- a/setup.c
+++ b/setup.c
@@ -1017,7 +1017,7 @@ void sanitize_stdfds(void)
close(fd);
}
-int daemonize(void)
+int daemonize(int *daemonized)
{
#ifdef NO_POSIX_GOODIES
errno = ENOSYS;
@@ -1029,6 +1029,8 @@ int daemonize(void)
case -1:
die_errno("fork failed");
default:
+ if (daemonized)
+ *daemonized = 1;
exit(0);
}
if (setsid() == -1)
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 07/19] index-helper: add --detach
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (5 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 06/19] daemonize(): set a flag before exiting the main process David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 08/19] read-cache: add watchman 'WAMA' extension David Turner
` (11 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
We detach after creating and opening the socket, because otherwise
we might return control to the shell before index-helper is ready to
accept commands. This might lead to flaky tests.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 3 +++
index-helper.c | 15 +++++++++++++--
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index 4eb3d95..18e1636 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -31,6 +31,9 @@ OPTIONS
for reading an index, but because it will happen in the
background, it's not noticable. `--strict` is enabled by default.
+--detach::
+ Detach from the shell.
+
NOTES
-----
diff --git a/index-helper.c b/index-helper.c
index 7400d68..4273773 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -17,7 +17,7 @@ struct shm {
static struct shm shm_index;
static struct shm shm_base_index;
-static int to_verify = 1;
+static int daemonized, to_verify = 1;
static void log_warning(const char *warning, ...)
{
@@ -59,6 +59,8 @@ static void cleanup_shm(void)
static void cleanup(void)
{
+ if (daemonized)
+ return;
unlink(git_path("index-helper.sock"));
cleanup_shm();
}
@@ -318,7 +320,7 @@ static const char * const usage_text[] = {
int main(int argc, char **argv)
{
const char *prefix;
- int idle_in_seconds = 600;
+ int idle_in_seconds = 600, detach = 0;
int fd;
struct strbuf socket_path = STRBUF_INIT;
struct option options[] = {
@@ -326,6 +328,7 @@ int main(int argc, char **argv)
N_("exit if not used after some seconds")),
OPT_BOOL(0, "strict", &to_verify,
"verify shared memory after creating"),
+ OPT_BOOL(0, "detach", &detach, "detach the process"),
OPT_END()
};
@@ -349,6 +352,14 @@ int main(int argc, char **argv)
if (fd < 0)
die_errno(_("could not set up index-helper socket"));
+ if (!freopen("/dev/null", "w", stderr))
+ die_errno("failed to redirect stderr to /dev/null");
+
+ if (!freopen("/dev/null", "w", stdout))
+ die_errno("failed to redirect stdout to /dev/null");
+
+ if (detach && daemonize(&daemonized))
+ die_errno(_("unable to detach"));
loop(fd, idle_in_seconds);
close(fd);
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 08/19] read-cache: add watchman 'WAMA' extension
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (6 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 07/19] index-helper: add --detach David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 09/19] Add watchman support to reduce index refresh cost David Turner
` (10 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
The extension contains a bitmap, one bit for each entry in the
index. If the n-th bit is zero, the n-th entry is considered
unchanged, we can ce_mark_uptodate() it without refreshing. If the bit
is non-zero and we found out the corresponding file is clean after
refresh, we can clear the bit.
In addition, there's a list of directories in the untracked-cache
to invalidate (because they have new or modified entries).
The 'skipping refresh' bit is not in this patch yet as we would need
watchman. More details in later patches.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/technical/index-format.txt | 22 ++++++
cache.h | 4 ++
dir.h | 3 +
read-cache.c | 117 ++++++++++++++++++++++++++++++-
4 files changed, 144 insertions(+), 2 deletions(-)
diff --git a/Documentation/technical/index-format.txt b/Documentation/technical/index-format.txt
index ade0b0c..86ed3a6 100644
--- a/Documentation/technical/index-format.txt
+++ b/Documentation/technical/index-format.txt
@@ -295,3 +295,25 @@ The remaining data of each directory block is grouped by type:
in the previous ewah bitmap.
- One NUL.
+
+== Watchman cache
+
+ The watchman cache tracks files for which watchman has told us about
+ changes. The signature for this extension is { 'W', 'A', 'M', 'A' }.
+
+ The extension starts with
+
+ - A NUL-terminated string: the watchman vector clock at the last
+ time we heard from watchman.
+
+ - 32-bit bitmap size: the size of the CE_WATCHMAN_DIRTY bitmap
+
+ - 32-bit untracked cache entry count: the number of dirty untracked
+ cache entries
+
+ - An ewah bitmap, the n-th bit indicates whether the n-th index entry
+ is CE_WATCHMAN_DIRTY.
+
+ - a list of N NUL-terminated strings. Each is a directory that should
+ be marked dirty in the untracked cache because watchman has told us
+ about an update to a file in it.
diff --git a/cache.h b/cache.h
index 0aeb994..f4f7eef 100644
--- a/cache.h
+++ b/cache.h
@@ -182,6 +182,8 @@ struct cache_entry {
#define CE_VALID (0x8000)
#define CE_STAGESHIFT 12
+#define CE_WATCHMAN_DIRTY (0x0001)
+
/*
* Range 0xFFFF0FFF in ce_flags is divided into
* two parts: in-memory flags and on-disk ones.
@@ -320,6 +322,7 @@ static inline unsigned int canon_mode(unsigned int mode)
#define CACHE_TREE_CHANGED (1 << 5)
#define SPLIT_INDEX_ORDERED (1 << 6)
#define UNTRACKED_CHANGED (1 << 7)
+#define WATCHMAN_CHANGED (1 << 8)
struct split_index;
struct untracked_cache;
@@ -344,6 +347,7 @@ struct index_state {
struct untracked_cache *untracked;
void *mmap;
size_t mmap_size;
+ char *last_update;
};
extern struct index_state the_index;
diff --git a/dir.h b/dir.h
index 3ec3fb0..3d540de 100644
--- a/dir.h
+++ b/dir.h
@@ -142,6 +142,9 @@ struct untracked_cache {
int gitignore_invalidated;
int dir_invalidated;
int dir_opened;
+ /* watchman invalidation data */
+ unsigned int use_watchman : 1;
+ struct string_list invalid_untracked;
};
struct dir_struct {
diff --git a/read-cache.c b/read-cache.c
index 9eedf03..512f9f0 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -20,6 +20,7 @@
#include "utf8.h"
#include "unix-socket.h"
#include "pkt-line.h"
+#include "ewah/ewok.h"
static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
unsigned int options);
@@ -42,11 +43,13 @@ static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
#define CACHE_EXT_RESOLVE_UNDO 0x52455543 /* "REUC" */
#define CACHE_EXT_LINK 0x6c696e6b /* "link" */
#define CACHE_EXT_UNTRACKED 0x554E5452 /* "UNTR" */
+#define CACHE_EXT_WATCHMAN 0x57414D41 /* "WAMA" */
/* changes that can be kept in $GIT_DIR/index (basically all extensions) */
#define EXTMASK (RESOLVE_UNDO_CHANGED | CACHE_TREE_CHANGED | \
CE_ENTRY_ADDED | CE_ENTRY_REMOVED | CE_ENTRY_CHANGED | \
- SPLIT_INDEX_ORDERED | UNTRACKED_CHANGED)
+ SPLIT_INDEX_ORDERED | UNTRACKED_CHANGED | \
+ WATCHMAN_CHANGED)
struct index_state the_index;
static const char *alternate_index_output;
@@ -1221,8 +1224,13 @@ int refresh_index(struct index_state *istate, unsigned int flags,
continue;
new = refresh_cache_ent(istate, ce, options, &cache_errno, &changed);
- if (new == ce)
+ if (new == ce) {
+ if (ce->ce_flags & CE_WATCHMAN_DIRTY) {
+ ce->ce_flags &= ~CE_WATCHMAN_DIRTY;
+ istate->cache_changed |= WATCHMAN_CHANGED;
+ }
continue;
+ }
if (!new) {
const char *fmt;
@@ -1366,6 +1374,94 @@ static int verify_hdr(const struct cache_header *hdr, unsigned long size)
return 0;
}
+static void mark_no_watchman(size_t pos, void *data)
+{
+ struct index_state *istate = data;
+ assert(pos < istate->cache_nr);
+ istate->cache[pos]->ce_flags |= CE_WATCHMAN_DIRTY;
+}
+
+static int read_watchman_ext(struct index_state *istate, const void *data,
+ unsigned long sz)
+{
+ struct ewah_bitmap *bitmap;
+ int ret, len;
+ uint32_t bitmap_size;
+ uint32_t untracked_nr;
+
+ if (memchr(data, 0, sz) == NULL)
+ return error("invalid extension");
+
+ len = strlen(data) + 1;
+ memcpy(&bitmap_size, (const char *)data + len, 4);
+ memcpy(&untracked_nr, (const char *)data + len + 4, 4);
+ untracked_nr = ntohl(untracked_nr);
+ bitmap_size = ntohl(bitmap_size);
+
+ bitmap = ewah_new();
+ ret = ewah_read_mmap(bitmap, (const char *)data + len + 8, bitmap_size);
+ if (ret != bitmap_size) {
+ ewah_free(bitmap);
+ return error("failed to parse ewah bitmap reading watchman index extension");
+ }
+ istate->last_update = xstrdup(data);
+ ewah_each_bit(bitmap, mark_no_watchman, istate);
+ ewah_free(bitmap);
+
+ /*
+ * TODO: update the untracked cache from the untracked data in this
+ * extension.
+ */
+ return 0;
+}
+
+static int untracked_entry_append(struct string_list_item *item, void *sbvoid)
+{
+ struct strbuf *sb = sbvoid;
+
+ strbuf_addstr(sb, item->string);
+ strbuf_addch(sb, 0);
+ return 0;
+}
+
+void write_watchman_ext(struct strbuf *sb, struct index_state* istate)
+{
+ struct ewah_bitmap *bitmap;
+ int i;
+ int ewah_start;
+ int ewah_size = 0;
+ int fixup = 0;
+
+ strbuf_add(sb, istate->last_update, strlen(istate->last_update) + 1);
+ fixup = sb->len;
+ strbuf_add(sb, &ewah_size, 4); /* we'll fix this up later */
+ if (istate->untracked) {
+ uint32_t nr = istate->untracked->invalid_untracked.nr;
+ nr = htonl(nr);
+ strbuf_add(sb, &nr, 4);
+ } else {
+ /* zero */
+ strbuf_add(sb, &ewah_size, 4);
+ }
+
+ ewah_start = sb->len;
+ bitmap = ewah_new();
+ for (i = 0; i < istate->cache_nr; i++)
+ if (istate->cache[i]->ce_flags & CE_WATCHMAN_DIRTY)
+ ewah_set(bitmap, i);
+ ewah_serialize_strbuf(bitmap, sb);
+ ewah_free(bitmap);
+
+ /* fix up size field */
+ ewah_size = sb->len - ewah_start;
+ ewah_size = htonl(ewah_size);
+ memcpy(sb->buf + fixup, &ewah_size, 4);
+
+ if (istate->untracked)
+ for_each_string_list(&istate->untracked->invalid_untracked,
+ untracked_entry_append, sb);
+}
+
static int read_index_extension(struct index_state *istate,
const char *ext, void *data, unsigned long sz)
{
@@ -1383,6 +1479,11 @@ static int read_index_extension(struct index_state *istate,
case CACHE_EXT_UNTRACKED:
istate->untracked = read_untracked_extension(data, sz);
break;
+
+ case CACHE_EXT_WATCHMAN:
+ read_watchman_ext(istate, data, sz);
+ break;
+
default:
if (*ext < 'A' || 'Z' < *ext)
return error("index uses %.4s extension, which we do not understand",
@@ -1814,6 +1915,8 @@ int discard_index(struct index_state *istate)
istate->untracked = NULL;
istate->from_shm = 0;
istate->to_shm = 0;
+ free(istate->last_update);
+ istate->last_update = NULL;
return 0;
}
@@ -2211,6 +2314,16 @@ static int do_write_index(struct index_state *istate, int newfd,
if (err)
return -1;
}
+ if (!strip_extensions && istate->last_update) {
+ struct strbuf sb = STRBUF_INIT;
+
+ write_watchman_ext(&sb, istate);
+ err = write_index_ext_header(&c, newfd, CACHE_EXT_WATCHMAN, sb.len) < 0
+ || ce_write(&c, newfd, sb.buf, sb.len) < 0;
+ strbuf_release(&sb);
+ if (err)
+ return -1;
+ }
if (ce_flush(&c, newfd, istate->sha1) || fstat(newfd, &st))
return -1;
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 09/19] Add watchman support to reduce index refresh cost
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (7 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 08/19] read-cache: add watchman 'WAMA' extension David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 10/19] index-helper: use watchman to avoid refreshing index with lstat() David Turner
` (9 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
The previous patch has the logic to clear bits in 'WAMA' bitmap. This
patch has logic to set bits as told by watchman. The missing bit,
_using_ these bits, are not here yet.
A lot of this code is written by David Turner originally, mostly from
[1]. I'm just copying and polishing it a bit.
[1] http://article.gmane.org/gmane.comp.version-control.git/248006
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
Makefile | 12 +++++
cache.h | 1 +
config.c | 5 ++
configure.ac | 8 ++++
environment.c | 3 ++
watchman-support.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++
watchman-support.h | 7 +++
7 files changed, 171 insertions(+)
create mode 100644 watchman-support.c
create mode 100644 watchman-support.h
diff --git a/Makefile b/Makefile
index c8be0e7..65ab0f4 100644
--- a/Makefile
+++ b/Makefile
@@ -451,6 +451,7 @@ MSGFMT = msgfmt
CURL_CONFIG = curl-config
PTHREAD_LIBS = -lpthread
PTHREAD_CFLAGS =
+WATCHMAN_LIBS =
GCOV = gcov
export TCL_PATH TCLTK_PATH
@@ -1416,6 +1417,13 @@ else
LIB_OBJS += thread-utils.o
endif
+ifdef USE_WATCHMAN
+ LIB_H += watchman-support.h
+ LIB_OBJS += watchman-support.o
+ WATCHMAN_LIBS = -lwatchman
+ BASIC_CFLAGS += -DUSE_WATCHMAN
+endif
+
ifdef HAVE_PATHS_H
BASIC_CFLAGS += -DHAVE_PATHS_H
endif
@@ -2025,6 +2033,9 @@ git-remote-testsvn$X: remote-testsvn.o GIT-LDFLAGS $(GITLIBS) $(VCSSVN_LIB)
$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) \
$(VCSSVN_LIB)
+git-index-helper$X: index-helper.o GIT-LDFLAGS $(GITLIBS)
+ $(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) $(WATCHMAN_LIBS)
+
$(REMOTE_CURL_ALIASES): $(REMOTE_CURL_PRIMARY)
$(QUIET_LNCP)$(RM) $@ && \
ln $< $@ 2>/dev/null || \
@@ -2164,6 +2175,7 @@ GIT-BUILD-OPTIONS: FORCE
@echo NO_PYTHON=\''$(subst ','\'',$(subst ','\'',$(NO_PYTHON)))'\' >>$@+
@echo NO_UNIX_SOCKETS=\''$(subst ','\'',$(subst ','\'',$(NO_UNIX_SOCKETS)))'\' >>$@+
@echo NO_MMAP=\''$(subst ','\'',$(subst ','\'',$(NO_MMAP)))'\' >>$@+
+ @echo USE_WATCHMAN=\''$(subst ','\'',$(subst ','\'',$(USE_WATCHMAN)))'\' >>$@+
ifdef TEST_OUTPUT_DIRECTORY
@echo TEST_OUTPUT_DIRECTORY=\''$(subst ','\'',$(subst ','\'',$(TEST_OUTPUT_DIRECTORY)))'\' >>$@+
endif
diff --git a/cache.h b/cache.h
index f4f7eef..37f211b 100644
--- a/cache.h
+++ b/cache.h
@@ -687,6 +687,7 @@ extern char *git_replace_ref_base;
extern int fsync_object_files;
extern int core_preload_index;
+extern int core_watchman_sync_timeout;
extern int core_apply_sparse_checkout;
extern int precomposed_unicode;
extern int protect_hfs;
diff --git a/config.c b/config.c
index 9ba40bc..e6dc141 100644
--- a/config.c
+++ b/config.c
@@ -882,6 +882,11 @@ static int git_default_core_config(const char *var, const char *value)
return 0;
}
+ if (!strcmp(var, "core.watchmansynctimeout")) {
+ core_watchman_sync_timeout = git_config_int(var, value);
+ return 0;
+ }
+
if (!strcmp(var, "core.createobject")) {
if (!strcmp(value, "rename"))
object_creation_mode = OBJECT_CREATION_USES_RENAMES;
diff --git a/configure.ac b/configure.ac
index 0cd9f46..334d63b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1099,6 +1099,14 @@ AC_COMPILE_IFELSE([BSD_SYSCTL_SRC],
HAVE_BSD_SYSCTL=])
GIT_CONF_SUBST([HAVE_BSD_SYSCTL])
+#
+# Check for watchman client library
+
+AC_CHECK_LIB([watchman], [watchman_connect],
+ [USE_WATCHMAN=YesPlease],
+ [USE_WATCHMAN=])
+GIT_CONF_SUBST([USE_WATCHMAN])
+
## Other checks.
# Define USE_PIC if you need the main git objects to be built with -fPIC
# in order to build and link perl/Git.so. x86-64 seems to need this.
diff --git a/environment.c b/environment.c
index 6dec9d0..35e03c7 100644
--- a/environment.c
+++ b/environment.c
@@ -94,6 +94,9 @@ int core_preload_index = 1;
*/
int ignore_untracked_cache_config;
+int core_watchman_sync_timeout = 300;
+
+
/* This is set by setup_git_dir_gently() and/or git_default_config() */
char *git_work_tree_cfg;
static char *work_tree;
diff --git a/watchman-support.c b/watchman-support.c
new file mode 100644
index 0000000..b168e88
--- /dev/null
+++ b/watchman-support.c
@@ -0,0 +1,135 @@
+#include "cache.h"
+#include "watchman-support.h"
+#include "strbuf.h"
+#include "dir.h"
+#include <watchman.h>
+
+static struct watchman_query *make_query(const char *last_update)
+{
+ struct watchman_query *query = watchman_query();
+ watchman_query_set_fields(query, WATCHMAN_FIELD_NAME |
+ WATCHMAN_FIELD_EXISTS |
+ WATCHMAN_FIELD_NEWER);
+ watchman_query_set_empty_on_fresh(query, 1);
+ query->sync_timeout = core_watchman_sync_timeout;
+ if (*last_update)
+ watchman_query_set_since_oclock(query, last_update);
+ return query;
+}
+
+static struct watchman_query_result* query_watchman(
+ struct index_state *istate, struct watchman_connection *connection,
+ const char *fs_path, const char *last_update)
+{
+ struct watchman_error wm_error;
+ struct watchman_query *query;
+ struct watchman_expression *expr;
+ struct watchman_query_result *result;
+
+ query = make_query(last_update);
+ expr = watchman_true_expression();
+ result = watchman_do_query(connection, fs_path, query, expr, &wm_error);
+ watchman_free_query(query);
+ watchman_free_expression(expr);
+
+ if (!result)
+ warning("Watchman query error: %s (at %s)",
+ wm_error.message,
+ *last_update ? last_update : "the beginning");
+
+ return result;
+}
+
+static void update_index(struct index_state *istate,
+ struct watchman_query_result *result)
+{
+ int i;
+
+ if (result->is_fresh_instance) {
+ /* let refresh clear them later */
+ for (i = 0; i < istate->cache_nr; i++)
+ istate->cache[i]->ce_flags |= CE_WATCHMAN_DIRTY;
+ goto done;
+ }
+
+ for (i = 0; i < result->nr; i++) {
+ struct watchman_stat *wm = result->stats + i;
+ int pos;
+
+ if (S_ISDIR(wm->mode) ||
+ !strncmp(wm->name, ".git/", 5) ||
+ strstr(wm->name, "/.git/"))
+ continue;
+
+ pos = index_name_pos(istate, wm->name, strlen(wm->name));
+ if (pos < 0) {
+ if (istate->untracked) {
+ char *name = xstrdup(wm->name);
+ char *dname = dirname(name);
+
+ /*
+ * dirname() returns '.' for the root,
+ * but we call it ''.
+ */
+ if (dname[0] == '.' && dname[1] == 0)
+ string_list_append(&istate->untracked->invalid_untracked, "");
+ else
+ string_list_append(&istate->untracked->invalid_untracked,
+ dname);
+ free(name);
+ }
+ continue;
+ }
+ /* FIXME: ignore staged entries and gitlinks too? */
+
+ istate->cache[pos]->ce_flags |= CE_WATCHMAN_DIRTY;
+ }
+
+done:
+ free(istate->last_update);
+ istate->last_update = xstrdup(result->clock);
+ istate->cache_changed |= WATCHMAN_CHANGED;
+ if (istate->untracked)
+ string_list_remove_duplicates(&istate->untracked->invalid_untracked, 0);
+}
+
+int check_watchman(struct index_state *istate)
+{
+ struct watchman_error wm_error;
+ struct watchman_connection *connection;
+ struct watchman_query_result *result;
+ const char *fs_path;
+ struct timeval timeout;
+ /*
+ * Convert core_watchman_sync_timeout, in milliseconds, to
+ * struct timeval, in seconds and microseconds.
+ */
+
+ fs_path = get_git_work_tree();
+ if (!fs_path)
+ return -1;
+
+ timeout.tv_sec = core_watchman_sync_timeout / 1000;
+ timeout.tv_usec = (core_watchman_sync_timeout % 1000) * 1000;
+ connection = watchman_connect(timeout, &wm_error);
+
+ if (!connection) {
+ warning("Watchman watch error: %s", wm_error.message);
+ return -1;
+ }
+
+ if (watchman_watch(connection, fs_path, &wm_error)) {
+ warning("Watchman watch error: %s", wm_error.message);
+ watchman_connection_close(connection);
+ return -1;
+ }
+
+
+ result = query_watchman(istate, connection, fs_path, istate->last_update);
+ watchman_connection_close(connection);
+ if (!result)
+ return -1;
+ update_index(istate, result);
+ watchman_free_query_result(result);
+ return 0;
+}
diff --git a/watchman-support.h b/watchman-support.h
new file mode 100644
index 0000000..ee1ef2c
--- /dev/null
+++ b/watchman-support.h
@@ -0,0 +1,7 @@
+#ifndef WATCHMAN_SUPPORT_H
+#define WATCHMAN_SUPPORT_H
+
+struct index_state;
+int check_watchman(struct index_state *index);
+
+#endif /* WATCHMAN_SUPPORT_H */
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 10/19] index-helper: use watchman to avoid refreshing index with lstat()
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (8 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 09/19] Add watchman support to reduce index refresh cost David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 11/19] update-index: enable/disable watchman support David Turner
` (8 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Watchman is hidden behind index-helper. Before git tries to read the
index from shm, it notifies index-helper through the socket and waits
for index-helper to prepare a file for sharing memory (with
MAP_SHARED). index-helper then contacts watchman, updates 'WAMA'
extension and put it in a separate file and wakes git up with a reply
to git's socket.
Git uses this extension to not lstat unchanged entries. Git only
trusts the 'WAMA' extension when it's received from the separate file,
not from disk. Unmarked entries are "clean". Marked entries are dirty
from watchman point of view. If it finds out some entries are
'watchman-dirty', but are really unchanged (e.g. the file was changed,
then reverted back), then Git will clear the marking in 'WAMA' before
writing it down.
Hiding watchman behind index-helper means you need both daemons. You
can't run watchman alone. Not so good. But on the other hand, 'git'
binary is not linked to watchman/json libraries, which is good for
packaging. Core git package will run fine without watchman-related
packages. If they need watchman, they can install git-index-helper and
dependencies.
This also lets us trust anything in the untracked cache that we haven't
marked invalid, saving those stat() calls.
Another reason for tying watchman to index-helper is, when used with
untracked cache, we need to keep track of $GIT_WORK_TREE file
listing. That kind of list can be kept in index-helper.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 6 +
cache.h | 2 +
dir.c | 23 +++-
dir.h | 3 +
index-helper.c | 105 ++++++++++++++--
read-cache.c | 243 ++++++++++++++++++++++++++++++++++---
6 files changed, 356 insertions(+), 26 deletions(-)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index 18e1636..647b796 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -52,6 +52,12 @@ command. The following commands are used to control the daemon:
Let the daemon know the index is to be read. It keeps the
daemon alive longer, unless `--exit-after=0` is used.
+"poke <path>":
+ Like "poke", but replies with "OK". If the index has the
+ watchman extension, index-helper queries watchman, then
+ prepares a shared memory object with the watchman index
+ extension before replying.
+
All commands and replies are terminated by a 0 byte.
In the event of an error, messages may be written to
diff --git a/cache.h b/cache.h
index 37f211b..4cc89bb 100644
--- a/cache.h
+++ b/cache.h
@@ -558,6 +558,7 @@ extern int daemonize(int *);
/* Initialize and use the cache information */
struct lock_file;
+extern int verify_index(const struct index_state *);
extern int read_index(struct index_state *);
extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
extern int do_read_index(struct index_state *istate, const char *path,
@@ -565,6 +566,7 @@ extern int do_read_index(struct index_state *istate, const char *path,
extern int read_index_from(struct index_state *, const char *path);
extern int is_index_unborn(struct index_state *);
extern int read_index_unmerged(struct index_state *);
+extern void write_watchman_ext(struct strbuf *sb, struct index_state* istate);
#define COMMIT_LOCK (1 << 0)
#define CLOSE_LOCK (1 << 1)
extern int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
diff --git a/dir.c b/dir.c
index 69e0be6..5058b29 100644
--- a/dir.c
+++ b/dir.c
@@ -597,9 +597,9 @@ static void trim_trailing_spaces(char *buf)
*
* If "name" has the trailing slash, it'll be excluded in the search.
*/
-static struct untracked_cache_dir *lookup_untracked(struct untracked_cache *uc,
- struct untracked_cache_dir *dir,
- const char *name, int len)
+struct untracked_cache_dir *lookup_untracked(struct untracked_cache *uc,
+ struct untracked_cache_dir *dir,
+ const char *name, int len)
{
int first, last;
struct untracked_cache_dir *d;
@@ -1726,6 +1726,17 @@ static int valid_cached_dir(struct dir_struct *dir,
if (!untracked)
return 0;
+ if (dir->untracked->use_watchman) {
+ /*
+ * With watchman, we can trust the untracked cache's
+ * valid field.
+ */
+ if (untracked->valid)
+ goto skip_stat;
+ else
+ invalidate_directory(dir->untracked, untracked);
+ }
+
if (stat(path->len ? path->buf : ".", &st)) {
invalidate_directory(dir->untracked, untracked);
memset(&untracked->stat_data, 0, sizeof(untracked->stat_data));
@@ -1739,6 +1750,7 @@ static int valid_cached_dir(struct dir_struct *dir,
return 0;
}
+skip_stat:
if (untracked->check_only != !!check_only) {
invalidate_directory(dir->untracked, untracked);
return 0;
@@ -2625,8 +2637,10 @@ static void free_untracked(struct untracked_cache_dir *ucd)
void free_untracked_cache(struct untracked_cache *uc)
{
- if (uc)
+ if (uc) {
free_untracked(uc->root);
+ string_list_clear(&uc->invalid_untracked, 0);
+ }
free(uc);
}
@@ -2775,6 +2789,7 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long
return NULL;
uc = xcalloc(1, sizeof(*uc));
+ string_list_init(&uc->invalid_untracked, 1);
strbuf_init(&uc->ident, ident_len);
strbuf_add(&uc->ident, ident, ident_len);
load_sha1_stat(&uc->ss_info_exclude, &ouc->info_exclude_stat,
diff --git a/dir.h b/dir.h
index 3d540de..8fd3f9e 100644
--- a/dir.h
+++ b/dir.h
@@ -315,4 +315,7 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long
void write_untracked_extension(struct strbuf *out, struct untracked_cache *untracked);
void add_untracked_cache(struct index_state *istate);
void remove_untracked_cache(struct index_state *istate);
+struct untracked_cache_dir *lookup_untracked(struct untracked_cache *uc,
+ struct untracked_cache_dir *dir,
+ const char *name, int len);
#endif
diff --git a/index-helper.c b/index-helper.c
index 4273773..a3c0221 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -8,15 +8,18 @@
#include "cache.h"
#include "unix-socket.h"
#include "pkt-line.h"
+#include "watchman-support.h"
struct shm {
unsigned char sha1[20];
void *shm;
size_t size;
+ pid_t pid;
};
static struct shm shm_index;
static struct shm shm_base_index;
+static struct shm shm_watchman;
static int daemonized, to_verify = 1;
static void log_warning(const char *warning, ...)
@@ -51,10 +54,21 @@ static void release_index_shm(struct shm *is)
is->shm = NULL;
}
+static void release_watchman_shm(struct shm *is)
+{
+ if (!is->shm)
+ return;
+ munmap(is->shm, is->size);
+ unlink(git_path("shm-watchman-%s-%" PRIuMAX,
+ sha1_to_hex(is->sha1), (uintmax_t)is->pid));
+ is->shm = NULL;
+}
+
static void cleanup_shm(void)
{
release_index_shm(&shm_index);
release_index_shm(&shm_base_index);
+ release_watchman_shm(&shm_watchman);
}
static void cleanup(void)
@@ -185,9 +199,10 @@ static void share_the_index(void)
if (the_index.split_index && the_index.split_index->base)
share_index(the_index.split_index->base, &shm_base_index);
share_index(&the_index, &shm_index);
- if (to_verify && !verify_shm())
+ if (to_verify && !verify_shm()) {
cleanup_shm();
- discard_index(&the_index);
+ discard_index(&the_index);
+ }
}
static void set_socket_blocking_flag(int fd, int make_nonblocking)
@@ -220,6 +235,78 @@ static void refresh(void)
#ifndef NO_MMAP
+#ifdef USE_WATCHMAN
+static void share_watchman(struct index_state *istate,
+ struct shm *is, pid_t pid)
+{
+ struct strbuf sb = STRBUF_INIT;
+ void *shm;
+
+ write_watchman_ext(&sb, istate);
+ if (!shared_mmap_create(O_CREAT | O_EXCL | O_RDWR, 0700, sb.len + 20,
+ &shm, PROT_READ | PROT_WRITE, MAP_SHARED,
+ git_path("shm-watchman-%s-%" PRIuMAX,
+ sha1_to_hex(istate->sha1),
+ (uintmax_t)pid))) {
+ is->size = sb.len + 20;
+ is->shm = shm;
+ is->pid = pid;
+ hashcpy(is->sha1, istate->sha1);
+
+ memcpy(shm, sb.buf, sb.len);
+ hashcpy((unsigned char *)shm + is->size - 20, is->sha1);
+ }
+ strbuf_release(&sb);
+}
+
+
+static void prepare_with_watchman(pid_t pid)
+{
+ /*
+ * TODO: with the help of watchman, maybe we could detect if
+ * $GIT_DIR/index is updated.
+ */
+ if (check_watchman(&the_index))
+ return;
+
+ share_watchman(&the_index, &shm_watchman, pid);
+}
+
+static void prepare_index(pid_t pid)
+{
+ if (shm_index.shm == NULL)
+ refresh();
+ release_watchman_shm(&shm_watchman);
+ if (the_index.last_update)
+ prepare_with_watchman(pid);
+}
+
+#endif
+
+static void reply_to_poke(int client_fd, const char *pid_buf)
+{
+ char *capabilities;
+ struct strbuf sb = STRBUF_INIT;
+
+#ifdef USE_WATCHMAN
+ pid_t client_pid = strtoull(pid_buf, NULL, 10);
+
+ prepare_index(client_pid);
+#endif
+ capabilities = strchr(pid_buf, ' ');
+
+ if (strcmp(capabilities, "watchman"))
+#ifdef USE_WATCHMAN
+ packet_buf_write(&sb, "OK watchman");
+#else
+ packet_buf_write(&sb, "NAK watchman");
+#endif
+ else
+ packet_buf_write(&sb, "OK");
+ if (write_in_full(client_fd, sb.buf, sb.len) != sb.len)
+ warning(_("client write failed"));
+}
+
static void loop(int fd, int idle_in_seconds)
{
struct timeval timeout;
@@ -282,11 +369,15 @@ static void loop(int fd, int idle_in_seconds)
buf[bytes_read] = 0;
if (!strcmp(buf, "refresh")) {
refresh();
- } else if (!strcmp(buf, "poke")) {
- /*
- * Just a poke to keep us
- * alive, nothing to do.
- */
+ } else if (starts_with(buf, "poke")) {
+ if (buf[4] == ' ') {
+ reply_to_poke(client_fd, buf + 5);
+ } else {
+ /*
+ * Just a poke to keep us
+ * alive, nothing to do.
+ */
+ }
} else {
log_warning("BUG: Bogus command %s", buf);
}
diff --git a/read-cache.c b/read-cache.c
index 512f9f0..a57f605 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1234,7 +1234,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
if (!new) {
const char *fmt;
- if (really && cache_errno == EINVAL) {
+ if (really || cache_errno == EINVAL) {
/* If we are doing --really-refresh that
* means the index is not valid anymore.
*/
@@ -1374,11 +1374,76 @@ static int verify_hdr(const struct cache_header *hdr, unsigned long size)
return 0;
}
+static struct untracked_cache_dir *find_untracked_cache_dir(
+ struct untracked_cache *uc, struct untracked_cache_dir *ucd,
+ const char *name)
+{
+ int component_len;
+ const char *end;
+ struct untracked_cache_dir *dir;
+
+ if (!*name)
+ return ucd;
+
+ end = strchr(name, '/');
+ if (end)
+ component_len = end - name;
+ else
+ component_len = strlen(name);
+
+ dir = lookup_untracked(uc, ucd, name, component_len);
+ if (dir)
+ return find_untracked_cache_dir(uc, dir, name + component_len + 1);
+
+ return NULL;
+}
+
static void mark_no_watchman(size_t pos, void *data)
{
struct index_state *istate = data;
+ struct cache_entry *ce = istate->cache[pos];
+ struct strbuf sb = STRBUF_INIT;
+ char *c;
+ struct untracked_cache_dir *dir;
+
assert(pos < istate->cache_nr);
- istate->cache[pos]->ce_flags |= CE_WATCHMAN_DIRTY;
+ ce->ce_flags |= CE_WATCHMAN_DIRTY;
+
+ if (!istate->untracked || !istate->untracked->root)
+ return;
+
+ strbuf_add(&sb, ce->name, ce_namelen(ce));
+
+ for (c = sb.buf + sb.len - 1; c > sb.buf; c--) {
+ if (*c == '/') {
+ strbuf_setlen(&sb, c - sb.buf);
+ break;
+ }
+ }
+
+ if (c == sb.buf) {
+ strbuf_setlen(&sb, 0);
+ }
+
+ dir = find_untracked_cache_dir(istate->untracked,
+ istate->untracked->root, sb.buf);
+ if (dir)
+ dir->valid = 0;
+
+ strbuf_release(&sb);
+}
+
+static int mark_untracked_invalid(struct string_list_item *item, void *uc)
+{
+ struct untracked_cache *untracked = uc;
+ struct untracked_cache_dir *dir;
+
+ dir = find_untracked_cache_dir(untracked, untracked->root,
+ item->string);
+ if (dir)
+ dir->valid = 0;
+
+ return 0;
}
static int read_watchman_ext(struct index_state *istate, const void *data,
@@ -1408,10 +1473,24 @@ static int read_watchman_ext(struct index_state *istate, const void *data,
ewah_each_bit(bitmap, mark_no_watchman, istate);
ewah_free(bitmap);
- /*
- * TODO: update the untracked cache from the untracked data in this
- * extension.
- */
+ if (istate->untracked && istate->untracked->root) {
+ int i;
+ const char *untracked;
+
+ untracked = (const char *)data + len + 8 + bitmap_size;
+ for (i = 0; i < untracked_nr; ++i) {
+ int len = strlen(untracked);
+ string_list_append(&istate->untracked->invalid_untracked,
+ untracked);
+ untracked += len + 1;
+ }
+
+ for_each_string_list(&istate->untracked->invalid_untracked,
+ mark_untracked_invalid, istate->untracked);
+
+ if (untracked_nr)
+ istate->cache_changed |= WATCHMAN_CHANGED;
+ }
return 0;
}
@@ -1644,28 +1723,90 @@ static void post_read_index_from(struct index_state *istate)
tweak_untracked_cache(istate);
}
+static int poke_and_wait_for_reply(int fd)
+{
+ struct strbuf buf = STRBUF_INIT;
+ int ret = -1;
+ fd_set fds;
+ struct timeval timeout;
+ int bytes_read;
+ char reply_buf[4096];
+ const char *requested_capabilities = "";
+
+#ifdef USE_WATCHMAN
+ requested_capabilities = "watchman";
+#endif
+
+ timeout.tv_usec = 0;
+ timeout.tv_sec = 1;
+
+ if (fd < 0)
+ return -1;
+
+ strbuf_addf(&buf, "poke %d %s", getpid(), requested_capabilities);
+ packet_write(fd, buf.buf, buf.len);
+ packet_flush(fd);
+
+ /* Now wait for a reply */
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ if (select(fd + 1, &fds, NULL, NULL, &timeout) == 0)
+ /* No reply, giving up */
+ goto done_poke;
+
+ bytes_read = packet_read(fd, NULL, NULL, reply_buf, sizeof(reply_buf),
+ PACKET_READ_GENTLE_ON_EOF |
+ PACKET_READ_CHOMP_NEWLINE);
+
+ if (bytes_read < 0)
+ goto done_poke;
+
+ if (!strcmp(reply_buf, "NAK watchman")
+#ifdef USE_WATCHMAN
+ || !ends_with(reply_buf, "watchman")
+#endif
+ ) {
+ warning("We requested watchman support from index-helper, but "
+ "it doesn't support it. Please use a version of git "
+ "index-helper with watchman support.");
+ goto done_poke;
+ }
+
+ if (!starts_with(reply_buf, "OK"))
+ goto done_poke;
+
+ ret = 0;
+done_poke:
+ close(fd);
+ strbuf_release(&buf);
+
+ return ret;
+}
+
static int poke_daemon(struct index_state *istate,
const struct stat *st, int refresh_cache)
{
int fd;
- int ret = 0;
- const char *socket_path;
+ int ret = -1;
/* if this is from index-helper, do not poke itself (recursively) */
if (istate->to_shm)
return 0;
- socket_path = git_path("index-helper.sock");
- if (!socket_path)
+ fd = unix_stream_connect(git_path("index-helper.sock"));
+ if (fd < 0) {
+ warning("Failed to connect to index-helper socket");
+ unlink(git_path("index-helper.sock"));
return -1;
+ }
- fd = unix_stream_connect(socket_path);
if (refresh_cache) {
packet_write(fd, "refresh");
+ packet_flush(fd);
+ ret = 0;
} else {
- packet_write(fd, "poke");
+ ret = poke_and_wait_for_reply(fd);
}
- packet_flush(fd);
close(fd);
return ret;
@@ -1734,6 +1875,74 @@ fail:
return -1;
}
+static void refresh_by_watchman(struct index_state *istate)
+{
+ void *shm = NULL;
+ int length;
+ int i;
+ struct stat st;
+ int fd = -1;
+ const char *path = git_path("shm-watchman-%s-%"PRIuMAX,
+ sha1_to_hex(istate->sha1),
+ (uintmax_t)getpid());
+
+ fd = open(path, O_RDONLY);
+ if (fd < 0)
+ return;
+
+ /*
+ * This watchman data is just for us -- no need to keep it
+ * around once we've got it open.
+ */
+ unlink(path);
+
+ if (fstat(fd, &st) < 0)
+ goto done;
+
+ length = st.st_size;
+ shm = mmap(NULL, length, PROT_READ, MAP_SHARED, fd, 0);
+
+ if (shm == MAP_FAILED)
+ goto done;
+
+ close(fd);
+ fd = -1;
+
+ if (length <= 20 ||
+ hashcmp(istate->sha1, (unsigned char *)shm + length - 20) ||
+ /*
+ * No need to clear CE_WATCHMAN_DIRTY set by 'WAMA' on
+ * disk. Watchman can only set more, not clear any, so
+ * this is OR mask.
+ */
+ read_watchman_ext(istate, shm, length - 20))
+ goto done;
+
+ /*
+ * Now that we've marked the invalid entries in the
+ * untracked-cache itself, we can erase them from the list of
+ * entries to be processed and mark the untracked cache for
+ * watchman usage.
+ */
+ if (istate->untracked) {
+ string_list_clear(&istate->untracked->invalid_untracked, 0);
+ istate->untracked->use_watchman = 1;
+ }
+
+ for (i = 0; i < istate->cache_nr; i++) {
+ struct cache_entry *ce = istate->cache[i];
+ if (ce_stage(ce) || (ce->ce_flags & CE_WATCHMAN_DIRTY))
+ continue;
+ ce_mark_uptodate(ce);
+ }
+done:
+ if (shm)
+ munmap(shm, length);
+
+ if (fd >= 0)
+ close(fd);
+}
+
/* remember to discard_cache() before reading a different cache! */
int do_read_index(struct index_state *istate, const char *path, int must_exist)
{
@@ -1853,7 +2062,7 @@ int read_index_from(struct index_state *istate, const char *path)
split_index = istate->split_index;
if (!split_index || is_null_sha1(split_index->base_sha1)) {
post_read_index_from(istate);
- return ret;
+ goto done;
}
if (split_index->base)
@@ -1874,6 +2083,10 @@ int read_index_from(struct index_state *istate, const char *path)
sha1_to_hex(split_index->base->sha1));
merge_base_index(istate);
post_read_index_from(istate);
+
+done:
+ if (ret > 0 && istate->from_shm && istate->last_update)
+ refresh_by_watchman(istate);
return ret;
}
@@ -2175,7 +2388,7 @@ out:
return 0;
}
-static int verify_index(const struct index_state *istate)
+int verify_index(const struct index_state *istate)
{
return verify_index_from(istate, get_index_file());
}
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 11/19] update-index: enable/disable watchman support
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (9 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 10/19] index-helper: use watchman to avoid refreshing index with lstat() David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 12/19] unpack-trees: preserve index extensions David Turner
` (7 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 3 +++
Documentation/git-update-index.txt | 6 ++++++
builtin/update-index.c | 16 ++++++++++++++++
3 files changed, 25 insertions(+)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index 647b796..d8b8efb 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -15,6 +15,9 @@ DESCRIPTION
Keep the index file in memory for faster access. This daemon is per
repository.
+If you want the index-helper to accelerate untracked file checking,
+run git update-index --watchman before using it.
+
OPTIONS
-------
diff --git a/Documentation/git-update-index.txt b/Documentation/git-update-index.txt
index c6cbed1..6736487 100644
--- a/Documentation/git-update-index.txt
+++ b/Documentation/git-update-index.txt
@@ -19,6 +19,7 @@ SYNOPSIS
[--ignore-submodules]
[--[no-]split-index]
[--[no-|test-|force-]untracked-cache]
+ [--[no-]watchman]
[--really-refresh] [--unresolve] [--again | -g]
[--info-only] [--index-info]
[-z] [--stdin] [--index-version <n>]
@@ -176,6 +177,11 @@ may not support it yet.
--no-untracked-cache::
Enable or disable untracked cache feature. Please use
`--test-untracked-cache` before enabling it.
+
+--watchman::
+--no-watchman::
+ Enable or disable watchman support. This is, at present,
+ only useful with git index-helper.
+
These options take effect whatever the value of the `core.untrackedCache`
configuration variable (see linkgit:git-config[1]). But a warning is
diff --git a/builtin/update-index.c b/builtin/update-index.c
index 1c94ca5..a3b4b5d 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -914,6 +914,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
{
int newfd, entries, has_errors = 0, nul_term_line = 0;
enum uc_mode untracked_cache = UC_UNSPECIFIED;
+ int use_watchman = -1;
int read_from_stdin = 0;
int prefix_length = prefix ? strlen(prefix) : 0;
int preferred_index_format = 0;
@@ -1012,6 +1013,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
N_("test if the filesystem supports untracked cache"), UC_TEST),
OPT_SET_INT(0, "force-untracked-cache", &untracked_cache,
N_("enable untracked cache without testing the filesystem"), UC_FORCE),
+ OPT_BOOL(0, "watchman", &use_watchman,
+ N_("use or not use watchman to reduce refresh cost")),
OPT_END()
};
@@ -1149,6 +1152,19 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
die("Bug: bad untracked_cache value: %d", untracked_cache);
}
+ if (use_watchman > 0) {
+ the_index.last_update = xstrdup("");
+ the_index.cache_changed |= WATCHMAN_CHANGED;
+#ifndef USE_WATCHMAN
+ warning("git was built without watchman support -- I'm "
+ "adding the extension here, but it probably won't "
+ "do you any good.");
+#endif
+ } else if (!use_watchman) {
+ the_index.last_update = NULL;
+ the_index.cache_changed |= WATCHMAN_CHANGED;
+ }
+
if (active_cache_changed) {
if (newfd < 0) {
if (refresh_args.flags & REFRESH_QUIET)
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 12/19] unpack-trees: preserve index extensions
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (10 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 11/19] update-index: enable/disable watchman support David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 13/19] watchman: add a config option to enable the extension David Turner
` (6 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Make git checkout (and other unpack_tree operations) preserve the
untracked cache and watchman status. This is valuable for two reasons:
1. Often, an unpack_tree operation will not touch large parts of the
working tree, and thus most of the untracked cache will continue to be
valid.
2. Even if the untracked cache were entirely invalidated by such an
operation, the user has signaled their intention to have such a cache,
and we don't want to throw it away.
The same logic applies to the watchman state.
Signed-off-by: David Turner <dturner@twopensource.com>
---
cache.h | 1 +
read-cache.c | 8 ++++++++
t/t7063-status-untracked-cache.sh | 22 ++++++++++++++++++++++
t/test-lib-functions.sh | 4 ++++
unpack-trees.c | 1 +
5 files changed, 36 insertions(+)
diff --git a/cache.h b/cache.h
index 4cc89bb..49fa128 100644
--- a/cache.h
+++ b/cache.h
@@ -571,6 +571,7 @@ extern void write_watchman_ext(struct strbuf *sb, struct index_state* istate);
#define CLOSE_LOCK (1 << 1)
extern int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
extern int discard_index(struct index_state *);
+extern void move_index_extensions(struct index_state *dst, struct index_state *src);
extern int unmerged_index(const struct index_state *);
extern int verify_path(const char *path);
extern int index_dir_exists(struct index_state *istate, const char *name, int namelen);
diff --git a/read-cache.c b/read-cache.c
index a57f605..470a27d 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2768,3 +2768,11 @@ void stat_validity_update(struct stat_validity *sv, int fd)
fill_stat_data(sv->sd, &st);
}
}
+
+void move_index_extensions(struct index_state *dst, struct index_state *src)
+{
+ dst->untracked = src->untracked;
+ src->untracked = NULL;
+ dst->last_update = src->last_update;
+ src->last_update = NULL;
+}
diff --git a/t/t7063-status-untracked-cache.sh b/t/t7063-status-untracked-cache.sh
index a971884..083516d 100755
--- a/t/t7063-status-untracked-cache.sh
+++ b/t/t7063-status-untracked-cache.sh
@@ -646,4 +646,26 @@ test_expect_success 'test ident field is working' '
test_cmp ../expect ../err
'
+test_expect_success 'untracked cache survives a checkout' '
+ git commit --allow-empty -m empty &&
+ test-dump-untracked-cache >../before &&
+ test_when_finished "git checkout master" &&
+ git checkout -b other_branch &&
+ test-dump-untracked-cache >../after &&
+ test_cmp ../before ../after &&
+ test_commit test &&
+ test-dump-untracked-cache >../before &&
+ git checkout master &&
+ test-dump-untracked-cache >../after &&
+ test_cmp ../before ../after
+'
+
+test_expect_success 'untracked cache survives a commit' '
+ test-dump-untracked-cache >../before &&
+ git add done/two &&
+ git commit -m commit &&
+ test-dump-untracked-cache >../after &&
+ test_cmp ../before ../after
+'
+
test_done
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 8d99eb3..e974b5b 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -186,6 +186,10 @@ test_commit () {
test_tick
fi &&
git commit $signoff -m "$1" &&
+ if [ "$(git config core.bare)" = false ]
+ then
+ git update-index --force-untracked-cache
+ fi
git tag "${4:-$1}"
}
diff --git a/unpack-trees.c b/unpack-trees.c
index 9f55cc2..fc90eb3 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1215,6 +1215,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
WRITE_TREE_SILENT |
WRITE_TREE_REPAIR);
}
+ move_index_extensions(&o->result, o->dst_index);
discard_index(o->dst_index);
*o->dst_index = o->result;
} else {
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 13/19] watchman: add a config option to enable the extension
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (11 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 12/19] unpack-trees: preserve index extensions David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 14/19] index-helper: kill mode David Turner
` (5 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
For installations that have centrally-managed configuration, it's
easier to set a config once than to run update-index on every
repository.
Signed-off-by: David Turner <dturner@twopensource.com>
---
.gitignore | 1 +
Documentation/config.txt | 4 ++++
Makefile | 1 +
read-cache.c | 6 ++++++
t/t1701-watchman-extension.sh | 37 +++++++++++++++++++++++++++++++++++++
test-dump-watchman.c | 16 ++++++++++++++++
6 files changed, 65 insertions(+)
create mode 100755 t/t1701-watchman-extension.sh
create mode 100644 test-dump-watchman.c
diff --git a/.gitignore b/.gitignore
index b92f122..e6a5b2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -188,6 +188,7 @@
/test-dump-cache-tree
/test-dump-split-index
/test-dump-untracked-cache
+/test-dump-watchman
/test-fake-ssh
/test-scrap-cache-tree
/test-genrandom
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2cd6bdd..15001ce 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1848,6 +1848,10 @@ imap::
The configuration variables in the 'imap' section are described
in linkgit:git-imap-send[1].
+index.addwatchmanextension::
+ Automatically add the watchman extension to the index whenever
+ it is written.
+
index.version::
Specify the version with which new index files should be
initialized. This does not affect existing repositories.
diff --git a/Makefile b/Makefile
index 65ab0f4..5f0a954 100644
--- a/Makefile
+++ b/Makefile
@@ -599,6 +599,7 @@ TEST_PROGRAMS_NEED_X += test-delta
TEST_PROGRAMS_NEED_X += test-dump-cache-tree
TEST_PROGRAMS_NEED_X += test-dump-split-index
TEST_PROGRAMS_NEED_X += test-dump-untracked-cache
+TEST_PROGRAMS_NEED_X += test-dump-watchman
TEST_PROGRAMS_NEED_X += test-fake-ssh
TEST_PROGRAMS_NEED_X += test-genrandom
TEST_PROGRAMS_NEED_X += test-hashmap
diff --git a/read-cache.c b/read-cache.c
index 470a27d..252299d 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2427,6 +2427,7 @@ static int do_write_index(struct index_state *istate, int newfd,
int entries = istate->cache_nr;
struct stat st;
struct strbuf previous_name_buf = STRBUF_INIT, *previous_name;
+ int watchman = 0;
for (i = removed = extended = 0; i < entries; i++) {
if (cache[i]->ce_flags & CE_REMOVE)
@@ -2450,6 +2451,11 @@ static int do_write_index(struct index_state *istate, int newfd,
if (istate->version == 3 || istate->version == 2)
istate->version = extended ? 3 : 2;
+ if (!git_config_get_bool("index.addwatchmanextension", &watchman) &&
+ watchman &&
+ !the_index.last_update)
+ the_index.last_update = xstrdup("");
+
hdr_version = istate->version;
hdr.hdr_signature = htonl(CACHE_SIGNATURE);
diff --git a/t/t1701-watchman-extension.sh b/t/t1701-watchman-extension.sh
new file mode 100755
index 0000000..71f1d46
--- /dev/null
+++ b/t/t1701-watchman-extension.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+test_description='watchman extension smoke tests'
+
+# These don't actually test watchman interaction -- just the
+# index extension
+
+. ./test-lib.sh
+
+test_expect_success 'enable watchman' '
+ test_commit a &&
+ test-dump-watchman .git/index >actual &&
+ echo "last_update: (null)" >expect &&
+ test_cmp expect actual &&
+ git update-index --watchman &&
+ test-dump-watchman .git/index >actual &&
+ echo "last_update: " >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success 'disable watchman' '
+ git update-index --no-watchman &&
+ test-dump-watchman .git/index >actual &&
+ echo "last_update: (null)" >expect &&
+ test_cmp expect actual
+'
+
+test_expect_success 'auto-enable watchman' '
+ test_config index.addwatchmanextension true &&
+ test_commit c &&
+ test-dump-watchman .git/index >actual &&
+ echo "last_update: " >expect &&
+ test_cmp expect actual
+'
+
+
+test_done
diff --git a/test-dump-watchman.c b/test-dump-watchman.c
new file mode 100644
index 0000000..0314fa5
--- /dev/null
+++ b/test-dump-watchman.c
@@ -0,0 +1,16 @@
+#include "cache.h"
+#include "ewah/ewok.h"
+
+int main(int argc, char **argv)
+{
+ do_read_index(&the_index, argv[1], 1);
+ printf("last_update: %s\n", the_index.last_update ?
+ the_index.last_update : "(null)");
+
+ /*
+ * For now, we just dump last_update, since it is not reasonable
+ * to populate the extension itself in tests.
+ */
+
+ return 0;
+}
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 14/19] index-helper: kill mode
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (12 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 13/19] watchman: add a config option to enable the extension David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 15/19] index-helper: don't run if already running David Turner
` (4 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Add a new command (and command-line arg) to allow index-helpers to
exit cleanly.
This is mainly useful for tests.
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 3 +++
index-helper.c | 31 ++++++++++++++++++++++++++++++-
t/t7900-index-helper.sh | 9 +++++++++
3 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index d8b8efb..d68afd7 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -37,6 +37,9 @@ OPTIONS
--detach::
Detach from the shell.
+--kill::
+ Kill any running index-helper and clean up the socket
+
NOTES
-----
diff --git a/index-helper.c b/index-helper.c
index a3c0221..60a71f2 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -378,6 +378,8 @@ static void loop(int fd, int idle_in_seconds)
* alive, nothing to do.
*/
}
+ } else if (!strcmp(buf, "die")) {
+ break;
} else {
log_warning("BUG: Bogus command %s", buf);
}
@@ -408,10 +410,29 @@ static const char * const usage_text[] = {
NULL
};
+static void request_kill(void)
+{
+ int fd = unix_stream_connect(git_path("index-helper.sock"));
+
+ if (fd >= 0) {
+ write_in_full(fd, "die", 4);
+ close(fd);
+ }
+
+ /*
+ * The child will try to do this anyway, but we want to be
+ * ready to launch a new daemon immediately after this command
+ * returns.
+ */
+
+ unlink(git_path("index-helper.sock"));
+ return;
+}
+
int main(int argc, char **argv)
{
const char *prefix;
- int idle_in_seconds = 600, detach = 0;
+ int idle_in_seconds = 600, detach = 0, kill = 0;
int fd;
struct strbuf socket_path = STRBUF_INIT;
struct option options[] = {
@@ -420,6 +441,7 @@ int main(int argc, char **argv)
OPT_BOOL(0, "strict", &to_verify,
"verify shared memory after creating"),
OPT_BOOL(0, "detach", &detach, "detach the process"),
+ OPT_BOOL(0, "kill", &kill, "request that existing index helper processes exit"),
OPT_END()
};
@@ -434,6 +456,13 @@ int main(int argc, char **argv)
options, usage_text, 0))
die(_("too many arguments"));
+ if (kill) {
+ if (detach)
+ die(_("--kill doesn't want any other options"));
+ request_kill();
+ return 0;
+ }
+
atexit(cleanup);
sigchain_push_common(cleanup_on_signal);
diff --git a/t/t7900-index-helper.sh b/t/t7900-index-helper.sh
index 114c112..e71b5af 100755
--- a/t/t7900-index-helper.sh
+++ b/t/t7900-index-helper.sh
@@ -20,4 +20,13 @@ test_expect_success 'index-helper smoke test' '
test_path_is_missing .git/index-helper.sock
'
+test_expect_success 'index-helper creates usable path file and can be killed' '
+ test_when_finished "git index-helper --kill" &&
+ test_path_is_missing .git/index-helper.sock &&
+ git index-helper --detach &&
+ test -S .git/index-helper.sock &&
+ git index-helper --kill &&
+ test_path_is_missing .git/index-helper.sock
+'
+
test_done
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 15/19] index-helper: don't run if already running
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (13 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 14/19] index-helper: kill mode David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 16/19] index-helper: autorun mode David Turner
` (3 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Signed-off-by: David Turner <dturner@twopensource.com>
---
index-helper.c | 7 +++++++
t/t7900-index-helper.sh | 9 +++++++++
2 files changed, 16 insertions(+)
diff --git a/index-helper.c b/index-helper.c
index 60a71f2..092c814 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -463,6 +463,13 @@ int main(int argc, char **argv)
return 0;
}
+ /* check that no other copy is running */
+ fd = unix_stream_connect(git_path("index-helper.sock"));
+ if (fd > 0)
+ die(_("Already running"));
+ if (errno != ECONNREFUSED && errno != ENOENT)
+ die_errno(_("Unexpected error checking socket"));
+
atexit(cleanup);
sigchain_push_common(cleanup_on_signal);
diff --git a/t/t7900-index-helper.sh b/t/t7900-index-helper.sh
index e71b5af..7159971 100755
--- a/t/t7900-index-helper.sh
+++ b/t/t7900-index-helper.sh
@@ -29,4 +29,13 @@ test_expect_success 'index-helper creates usable path file and can be killed' '
test_path_is_missing .git/index-helper.sock
'
+test_expect_success 'index-helper will not start if already running' '
+ test_when_finished "git index-helper --kill" &&
+ git index-helper --detach &&
+ test -S .git/index-helper.sock &&
+ test_must_fail git index-helper 2>err &&
+ test -S .git/index-helper.sock &&
+ grep "Already running" err
+'
+
test_done
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 16/19] index-helper: autorun mode
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (14 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 15/19] index-helper: don't run if already running David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 17/19] index-helper: optionally automatically run David Turner
` (2 subsequent siblings)
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Soon, we'll want to automatically start index-helper, so we need
a mode that silently exits if it can't start up (either because
it's not in a git dir, or because another one is already running).
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/git-index-helper.txt | 4 ++++
index-helper.c | 29 +++++++++++++++++++++++------
t/t7900-index-helper.sh | 8 ++++++++
3 files changed, 35 insertions(+), 6 deletions(-)
diff --git a/Documentation/git-index-helper.txt b/Documentation/git-index-helper.txt
index d68afd7..94766ec 100644
--- a/Documentation/git-index-helper.txt
+++ b/Documentation/git-index-helper.txt
@@ -40,6 +40,10 @@ OPTIONS
--kill::
Kill any running index-helper and clean up the socket
+--autorun::
+ If index-helper is not already running, start it. Else, do
+ nothing.
+
NOTES
-----
diff --git a/index-helper.c b/index-helper.c
index 092c814..334ed4b 100644
--- a/index-helper.c
+++ b/index-helper.c
@@ -432,8 +432,9 @@ static void request_kill(void)
int main(int argc, char **argv)
{
const char *prefix;
- int idle_in_seconds = 600, detach = 0, kill = 0;
+ int idle_in_seconds = 600, detach = 0, kill = 0, autorun = 0;
int fd;
+ int nongit;
struct strbuf socket_path = STRBUF_INIT;
struct option options[] = {
OPT_INTEGER(0, "exit-after", &idle_in_seconds,
@@ -442,6 +443,7 @@ int main(int argc, char **argv)
"verify shared memory after creating"),
OPT_BOOL(0, "detach", &detach, "detach the process"),
OPT_BOOL(0, "kill", &kill, "request that existing index helper processes exit"),
+ OPT_BOOL(0, "autorun", &autorun, "this is an automatic run of git index-helper, so certain errors can be solved by silently exiting"),
OPT_END()
};
@@ -451,7 +453,14 @@ int main(int argc, char **argv)
if (argc == 2 && !strcmp(argv[1], "-h"))
usage_with_options(usage_text, options);
- prefix = setup_git_directory();
+ prefix = setup_git_directory_gently(&nongit);
+ if (nongit) {
+ if (autorun)
+ exit(0);
+ else
+ die(_("not a git repository"));
+ }
+
if (parse_options(argc, (const char **)argv, prefix,
options, usage_text, 0))
die(_("too many arguments"));
@@ -465,10 +474,18 @@ int main(int argc, char **argv)
/* check that no other copy is running */
fd = unix_stream_connect(git_path("index-helper.sock"));
- if (fd > 0)
- die(_("Already running"));
- if (errno != ECONNREFUSED && errno != ENOENT)
- die_errno(_("Unexpected error checking socket"));
+ if (fd > 0) {
+ if (autorun)
+ exit(0);
+ else
+ die(_("Already running"));
+ }
+ if (errno != ECONNREFUSED && errno != ENOENT) {
+ if (autorun)
+ return 0;
+ else
+ die_errno(_("Unexpected error checking socket"));
+ }
atexit(cleanup);
sigchain_push_common(cleanup_on_signal);
diff --git a/t/t7900-index-helper.sh b/t/t7900-index-helper.sh
index 7159971..aa6e5fc 100755
--- a/t/t7900-index-helper.sh
+++ b/t/t7900-index-helper.sh
@@ -38,4 +38,12 @@ test_expect_success 'index-helper will not start if already running' '
grep "Already running" err
'
+test_expect_success 'index-helper is quiet with --autorun' '
+ test_when_finished "git index-helper --kill" &&
+ git index-helper --kill &&
+ git index-helper --detach &&
+ test -S .git/index-helper.sock &&
+ git index-helper --autorun
+'
+
test_done
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 17/19] index-helper: optionally automatically run
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (15 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 16/19] index-helper: autorun mode David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 18/19] Add tracing to measure where most of the time is spent David Turner
2016-04-27 20:04 ` [PATCH v6 19/19] untracked-cache: config option David Turner
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Introduce a new config option, indexhelper.autorun, to automatically
run git index-helper before starting up a builtin git command. This
enables users to keep index-helper running without manual
intervention.
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/config.txt | 4 ++++
read-cache.c | 37 +++++++++++++++++++++++++++++++++++--
t/t7900-index-helper.sh | 19 +++++++++++++++++++
3 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 15001ce..385ea66 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1856,6 +1856,10 @@ index.version::
Specify the version with which new index files should be
initialized. This does not affect existing repositories.
+indexhelper.autorun::
+ Automatically run git index-helper when any builtin git
+ command is run inside a repository.
+
init.templateDir::
Specify the directory from which templates will be copied.
(See the "TEMPLATE DIRECTORY" section of linkgit:git-init[1].)
diff --git a/read-cache.c b/read-cache.c
index 252299d..9329967 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -21,6 +21,7 @@
#include "unix-socket.h"
#include "pkt-line.h"
#include "ewah/ewok.h"
+#include "run-command.h"
static struct cache_entry *refresh_cache_entry(struct cache_entry *ce,
unsigned int options);
@@ -1723,6 +1724,33 @@ static void post_read_index_from(struct index_state *istate)
tweak_untracked_cache(istate);
}
+static int want_auto_index_helper(void)
+{
+ int want = -1;
+ const char *value = NULL;
+ const char *key = "indexhelper.autorun";
+
+ if (git_config_key_is_valid(key) &&
+ !git_config_get_value(key, &value)) {
+ int b = git_config_maybe_bool(key, value);
+ want = b >= 0 ? b : 0;
+ }
+ return want;
+}
+
+static void autorun_index_helper(void)
+{
+ const char *argv[] = {"git-index-helper", "--detach", "--autorun", NULL};
+ if (want_auto_index_helper() <= 0)
+ return;
+
+ trace_argv_printf(argv, "trace: auto index-helper:");
+
+ if (run_command_v_opt(argv,
+ RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT))
+ warning(_("You specified indexhelper.autorun, but running git-index-helper failed."));
+}
+
static int poke_and_wait_for_reply(int fd)
{
struct strbuf buf = STRBUF_INIT;
@@ -1797,6 +1825,7 @@ static int poke_daemon(struct index_state *istate,
if (fd < 0) {
warning("Failed to connect to index-helper socket");
unlink(git_path("index-helper.sock"));
+ autorun_index_helper();
return -1;
}
@@ -1834,9 +1863,13 @@ static int try_shm(struct index_state *istate)
int fd = -1;
if (!is_main_index(istate) ||
- old_size <= 20 ||
- stat(git_path("index-helper.sock"), &st))
+ old_size <= 20)
return -1;
+
+ if (stat(git_path("index-helper.sock"), &st)) {
+ autorun_index_helper();
+ return -1;
+ }
if (poke_daemon(istate, &st, 0))
return -1;
sha1 = (unsigned char *)istate->mmap + old_size - 20;
diff --git a/t/t7900-index-helper.sh b/t/t7900-index-helper.sh
index aa6e5fc..2d3ce3c 100755
--- a/t/t7900-index-helper.sh
+++ b/t/t7900-index-helper.sh
@@ -16,6 +16,9 @@ test -n "$NO_MMAP" && {
}
test_expect_success 'index-helper smoke test' '
+ # We need an existing commit so that the index exists (otherwise,
+ # the index-helper will not be autostarted)
+ test_commit x &&
git index-helper --exit-after 1 &&
test_path_is_missing .git/index-helper.sock
'
@@ -46,4 +49,20 @@ test_expect_success 'index-helper is quiet with --autorun' '
git index-helper --autorun
'
+test_expect_success 'index-helper autorun works' '
+ rm -f .git/index-helper.sock &&
+ git status &&
+ test_path_is_missing .git/index-helper.sock &&
+ test_config indexhelper.autorun true &&
+ git status &&
+ test -S .git/index-helper.sock &&
+ git status 2>err &&
+ test -S .git/index-helper.sock &&
+ ! grep -q . err &&
+ git index-helper --kill &&
+ test_config indexhelper.autorun false &&
+ git status &&
+ test_path_is_missing .git/index-helper.sock
+'
+
test_done
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 18/19] Add tracing to measure where most of the time is spent
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (16 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 17/19] index-helper: optionally automatically run David Turner
@ 2016-04-27 20:04 ` David Turner
2016-04-27 20:04 ` [PATCH v6 19/19] untracked-cache: config option David Turner
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
All the known heavy code blocks are measured (except object database
access). This should help identify if an optimization is effective or
not. An unoptimized git-status would give something like below (92% of
time is accounted). To sum up the effort of making git scale better:
- read cache line is being addressed by index-helper
- preload/refresh index by watchman
- read packed refs by lmdb backend
- diff-index by rebuilding cache-tree
- read directory by untracked cache and watchman
- write index by split index
- name hash potientially by index-helper
read-cache.c:2075 performance: 0.004058570 s: read cache .../index
preload-index.c:104 performance: 0.004419864 s: preload index
read-cache.c:1265 performance: 0.000185224 s: refresh index
refs/files-backend.c:1100 performance: 0.001935788 s: read packed refs
diff-lib.c:240 performance: 0.000144132 s: diff-files
diff-lib.c:506 performance: 0.013592000 s: diff-index
name-hash.c:128 performance: 0.000614177 s: initialize name hash
dir.c:2030 performance: 0.015814103 s: read directory
read-cache.c:2565 performance: 0.004052343 s: write index, changed mask = 2
trace.c:420 performance: 0.048365509 s: git command: './git' 'status'
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: David Turner <dturner@twopensource.com>
---
diff-lib.c | 4 ++++
dir.c | 2 ++
name-hash.c | 2 ++
preload-index.c | 2 ++
read-cache.c | 11 +++++++++++
refs/files-backend.c | 2 ++
6 files changed, 23 insertions(+)
diff --git a/diff-lib.c b/diff-lib.c
index bc49c70..7af7f9a 100644
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -90,6 +90,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
int diff_unmerged_stage = revs->max_count;
unsigned ce_option = ((option & DIFF_RACY_IS_MODIFIED)
? CE_MATCH_RACY_IS_DIRTY : 0);
+ uint64_t start = getnanotime();
diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/");
@@ -236,6 +237,7 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
}
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
+ trace_performance_since(start, "diff-files");
return 0;
}
@@ -491,6 +493,7 @@ static int diff_cache(struct rev_info *revs,
int run_diff_index(struct rev_info *revs, int cached)
{
struct object_array_entry *ent;
+ uint64_t start = getnanotime();
ent = revs->pending.objects;
if (diff_cache(revs, ent->item->oid.hash, ent->name, cached))
@@ -500,6 +503,7 @@ int run_diff_index(struct rev_info *revs, int cached)
diffcore_fix_diff_index(&revs->diffopt);
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
+ trace_performance_since(start, "diff-index");
return 0;
}
diff --git a/dir.c b/dir.c
index 5058b29..c56a8b9 100644
--- a/dir.c
+++ b/dir.c
@@ -2183,6 +2183,7 @@ int read_directory(struct dir_struct *dir, const char *path, int len, const stru
{
struct path_simplify *simplify;
struct untracked_cache_dir *untracked;
+ uint64_t start = getnanotime();
/*
* Check out create_simplify()
@@ -2224,6 +2225,7 @@ int read_directory(struct dir_struct *dir, const char *path, int len, const stru
free_simplify(simplify);
qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
+ trace_performance_since(start, "read directory %.*s", len, path);
if (dir->untracked) {
static struct trace_key trace_untracked_stats = TRACE_KEY_INIT(UNTRACKED_STATS);
trace_printf_key(&trace_untracked_stats,
diff --git a/name-hash.c b/name-hash.c
index 6d9f23e..b3966d8 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -115,6 +115,7 @@ static int cache_entry_cmp(const struct cache_entry *ce1,
static void lazy_init_name_hash(struct index_state *istate)
{
int nr;
+ uint64_t start = getnanotime();
if (istate->name_hash_initialized)
return;
@@ -124,6 +125,7 @@ static void lazy_init_name_hash(struct index_state *istate)
for (nr = 0; nr < istate->cache_nr; nr++)
hash_index_entry(istate, istate->cache[nr]);
istate->name_hash_initialized = 1;
+ trace_performance_since(start, "initialize name hash");
}
void add_name_hash(struct index_state *istate, struct cache_entry *ce)
diff --git a/preload-index.c b/preload-index.c
index c1fe3a3..7bb4809 100644
--- a/preload-index.c
+++ b/preload-index.c
@@ -72,6 +72,7 @@ static void preload_index(struct index_state *index,
{
int threads, i, work, offset;
struct thread_data data[MAX_PARALLEL];
+ uint64_t start = getnanotime();
if (!core_preload_index)
return;
@@ -100,6 +101,7 @@ static void preload_index(struct index_state *index,
if (pthread_join(p->pthread, NULL))
die("unable to join threaded lstat");
}
+ trace_performance_since(start, "preload index");
}
#endif
diff --git a/read-cache.c b/read-cache.c
index 9329967..e56a644 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1188,6 +1188,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
const char *typechange_fmt;
const char *added_fmt;
const char *unmerged_fmt;
+ uint64_t start = getnanotime();
modified_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n");
deleted_fmt = (in_porcelain ? "D\t%s\n" : "%s: needs update\n");
@@ -1262,6 +1263,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
replace_index_entry(istate, i, new);
}
+ trace_performance_since(start, "refresh index");
return has_errors;
}
@@ -2085,12 +2087,15 @@ int read_index_from(struct index_state *istate, const char *path)
{
struct split_index *split_index;
int ret;
+ uint64_t start;
/* istate->initialized covers both .git/index and .git/sharedindex.xxx */
if (istate->initialized)
return istate->cache_nr;
+ start = getnanotime();
ret = do_read_index(istate, path, 0);
+ trace_performance_since(start, "read cache %s", path);
split_index = istate->split_index;
if (!split_index || is_null_sha1(split_index->base_sha1)) {
@@ -2105,6 +2110,7 @@ int read_index_from(struct index_state *istate, const char *path)
split_index->base->keep_mmap = istate->keep_mmap;
split_index->base->to_shm = istate->to_shm;
split_index->base->from_shm = istate->from_shm;
+ start = getnanotime();
ret = do_read_index(split_index->base,
git_path("sharedindex.%s",
sha1_to_hex(split_index->base_sha1)), 1);
@@ -2116,6 +2122,9 @@ int read_index_from(struct index_state *istate, const char *path)
sha1_to_hex(split_index->base->sha1));
merge_base_index(istate);
post_read_index_from(istate);
+ trace_performance_since(start, "read cache %s",
+ git_path("sharedindex.%s",
+ sha1_to_hex(split_index->base_sha1)));
done:
if (ret > 0 && istate->from_shm && istate->last_update)
@@ -2461,6 +2470,7 @@ static int do_write_index(struct index_state *istate, int newfd,
struct stat st;
struct strbuf previous_name_buf = STRBUF_INIT, *previous_name;
int watchman = 0;
+ uint64_t start = getnanotime();
for (i = removed = extended = 0; i < entries; i++) {
if (cache[i]->ce_flags & CE_REMOVE)
@@ -2581,6 +2591,7 @@ static int do_write_index(struct index_state *istate, int newfd,
return -1;
istate->timestamp.sec = (unsigned int)st.st_mtime;
istate->timestamp.nsec = ST_MTIME_NSEC(st);
+ trace_performance_since(start, "write index, changed mask = %x", istate->cache_changed);
return 0;
}
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 81f68f8..57571ce 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1048,6 +1048,7 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir)
struct ref_entry *last = NULL;
struct strbuf line = STRBUF_INIT;
enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
+ uint64_t start = getnanotime();
while (strbuf_getwholeline(&line, f, '\n') != EOF) {
unsigned char sha1[20];
@@ -1096,6 +1097,7 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir)
}
strbuf_release(&line);
+ trace_performance_since(start, "read packed refs");
}
/*
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread* [PATCH v6 19/19] untracked-cache: config option
2016-04-27 20:04 [PATCH v6 00/19] index-helper/watchman David Turner
` (17 preceding siblings ...)
2016-04-27 20:04 ` [PATCH v6 18/19] Add tracing to measure where most of the time is spent David Turner
@ 2016-04-27 20:04 ` David Turner
18 siblings, 0 replies; 24+ messages in thread
From: David Turner @ 2016-04-27 20:04 UTC (permalink / raw)
To: git, pclouds; +Cc: David Turner
Add a config option to populate the untracked cache.
For installations that have centrally-managed configuration, it's
easier to set a config once than to run update-index on every
repository.
Signed-off-by: David Turner <dturner@twopensource.com>
---
Documentation/config.txt | 4 ++++
read-cache.c | 7 ++++++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 385ea66..c7b76ef 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1848,6 +1848,10 @@ imap::
The configuration variables in the 'imap' section are described
in linkgit:git-imap-send[1].
+index.adduntrackedcache::
+ Automatically populate the untracked cache whenever the index
+ is written.
+
index.addwatchmanextension::
Automatically add the watchman extension to the index whenever
it is written.
diff --git a/read-cache.c b/read-cache.c
index e56a644..40869fe 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2469,7 +2469,7 @@ static int do_write_index(struct index_state *istate, int newfd,
int entries = istate->cache_nr;
struct stat st;
struct strbuf previous_name_buf = STRBUF_INIT, *previous_name;
- int watchman = 0;
+ int watchman = 0, untracked = 0;
uint64_t start = getnanotime();
for (i = removed = extended = 0; i < entries; i++) {
@@ -2499,6 +2499,11 @@ static int do_write_index(struct index_state *istate, int newfd,
!the_index.last_update)
the_index.last_update = xstrdup("");
+ if (!git_config_get_bool("index.adduntrackedcache", &untracked) &&
+ untracked &&
+ !istate->untracked)
+ add_untracked_cache(&the_index);
+
hdr_version = istate->version;
hdr.hdr_signature = htonl(CACHE_SIGNATURE);
--
2.4.2.767.g62658d5-twtrsrc
^ permalink raw reply related [flat|nested] 24+ messages in thread