[PATCH 2/6] perf tools: Move the build-id storage operations to headers

Frederic Weisbecker
2009-11-11T03:51:16Z

So that it makes easier to control it. Especially because we plan
to give it a feature section.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
---
tools/perf/builtin-record.c | 32 ++------------------------------
tools/perf/util/header.c | 41 ++++++++++++++++++++++++++++++++++++++---
tools/perf/util/header.h | 2 +-
3 files changed, 41 insertions(+), 34 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 2b45d33..3044a62 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -378,39 +378,11 @@ static void open_counters(int cpu, pid_t pid)
nr_cpu++;
}

-static bool write_buildid_table(void)
-{
- struct dso *pos;
- bool have_buildid = false;
-
- list_for_each_entry(pos, &dsos, node) {
- struct build_id_event b;
- size_t len;
-
- if (filename__read_build_id(pos->long_name,
- &b.build_id,
- sizeof(b.build_id)) < 0)
- continue;
- have_buildid = true;
- memset(&b.header, 0, sizeof(b.header));
- len = strlen(pos->long_name) + 1;
- len = ALIGN(len, 64);
- b.header.size = sizeof(b) + len;
- write_output(&b, sizeof(b));
- write_output(pos->long_name, len);
- }
-
- return have_buildid;
-}
-
static void atexit_header(void)
{
header->data_size += bytes_written;

- if (write_buildid_table())
- perf_header__set_feat(header, HEADER_BUILD_ID);
-
- perf_header__write(header, output);
+ perf_header__write(header, output, true);
}

static int __cmd_record(int argc, const char **argv)
@@ -487,7 +459,7 @@ static int __cmd_record(int argc, const char **argv)
}

if (file_new)
- perf_header__write(header, output);
+ perf_header__write(header, output, false);

if (!system_wide)
event__synthesize_thread(pid, process_synthesized_event);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 050f543..a4d0bbe 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2,11 +2,13 @@
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
+#include <linux/list.h>

#include "util.h"
#include "header.h"
#include "../perf.h"
#include "trace-event.h"
+#include "symbol.h"

/*
* Create new perf.data header attribute:
@@ -172,7 +174,33 @@ static void do_write(int fd, void *buf, size_t size)
}
}

-static void perf_header__adds_write(struct perf_header *self, int fd)
+static bool write_buildid_table(int fd)
+{
+ struct dso *pos;
+ bool have_buildid = false;
+
+ list_for_each_entry(pos, &dsos, node) {
+ struct build_id_event b;
+ size_t len;
+
+ if (filename__read_build_id(pos->long_name,
+ &b.build_id,
+ sizeof(b.build_id)) < 0)
+ continue;
+ have_buildid = true;
+ memset(&b.header, 0, sizeof(b.header));
+ len = strlen(pos->long_name) + 1;
+ len = ALIGN(len, 64);
+ b.header.size = sizeof(b) + len;
+ do_write(fd, &b, sizeof(b));
+ do_write(fd, pos->long_name, len);
+ }
+
+ return have_buildid;
+}
+
+static void
+perf_header__adds_write(struct perf_header *self, int fd, bool at_exit)
{
struct perf_file_section trace_sec;
u64 cur_offset = lseek(fd, 0, SEEK_CUR);
@@ -196,9 +224,16 @@ static void perf_header__adds_write(struct perf_header *self, int fd)
*/
cur_offset = lseek(fd, trace_sec.offset + trace_sec.size, SEEK_SET);
}
+
+ if (at_exit) {
+ lseek(fd, self->data_offset + self->data_size, SEEK_SET);
+ if (write_buildid_table(fd))
+ perf_header__set_feat(self, HEADER_BUILD_ID);
+ lseek(fd, cur_offset, SEEK_SET);
+ }
};

-void perf_header__write(struct perf_header *self, int fd)
+void perf_header__write(struct perf_header *self, int fd, bool at_exit)
{
struct perf_file_header f_header;
struct perf_file_attr f_attr;
@@ -236,7 +271,7 @@ void perf_header__write(struct perf_header *self, int fd)
if (events)
do_write(fd, events, self->event_size);

- perf_header__adds_write(self, fd);
+ perf_header__adds_write(self, fd, at_exit);

self->data_offset = lseek(fd, 0, SEEK_CUR);

diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 2f233c5..77186c9 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -33,7 +33,7 @@ struct perf_header {
};

struct perf_header *perf_header__read(int fd);
-void perf_header__write(struct perf_header *self, int fd);
+void perf_header__write(struct perf_header *self, int fd, bool at_exit);

void perf_header__add_attr(struct perf_header *self,
struct perf_header_attr *attr);
--
1.6.2.3