[tip:perf/core] perf tools: Record whether a dso has data

tip-bot for Adrian Hunter
2014-07-28T08:31:54Z

Commit-ID: c27697d6dee02ef2389b6701c792a075bc9873dc
Gitweb: http://git.kernel.org/tip/c27697d6dee02ef2389b6701c792a075bc9873dc
Author: Adrian Hunter <adrian.hunter@intel.com>
AuthorDate: Tue, 22 Jul 2014 16:17:18 +0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 23 Jul 2014 11:22:35 -0300

perf tools: Record whether a dso has data

Add 'data.status' to record whether a dso has data (i.e. an object
file). This is used to avoid repeatedly creating the file name and
attempting to open a file that is not present.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1406035081-14301-10-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/dso.c | 23 +++++++++++++++--------
tools/perf/util/dso.h | 7 +++++++
2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 28cf747..8827db3 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -331,26 +331,32 @@ int dso__data_fd(struct dso *dso, struct machine *machine)
};
int i = 0;

+ if (dso->data.status == DSO_DATA_STATUS_ERROR)
+ return -1;
+
if (dso->data.fd >= 0)
- return dso->data.fd;
+ goto out;

if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) {
dso->data.fd = open_dso(dso, machine);
- return dso->data.fd;
+ goto out;
}

do {
- int fd;
-
dso->binary_type = binary_type_data[i++];

- fd = open_dso(dso, machine);
- if (fd >= 0)
- return dso->data.fd = fd;
+ dso->data.fd = open_dso(dso, machine);
+ if (dso->data.fd >= 0)
+ goto out;

} while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND);
+out:
+ if (dso->data.fd >= 0)
+ dso->data.status = DSO_DATA_STATUS_OK;
+ else
+ dso->data.status = DSO_DATA_STATUS_ERROR;

- return -EINVAL;
+ return dso->data.fd;
}

static void
@@ -701,6 +707,7 @@ struct dso *dso__new(const char *name)
dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
dso->data.cache = RB_ROOT;
dso->data.fd = -1;
+ dso->data.status = DSO_DATA_STATUS_UNKNOWN;
dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
dso->binary_type = DSO_BINARY_TYPE__NOT_FOUND;
dso->is_64_bit = (sizeof(void *) == 8);
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index c239e86..aeb7bcb 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -40,6 +40,12 @@ enum dso_swap_type {
DSO_SWAP__YES,
};

+enum dso_data_status {
+ DSO_DATA_STATUS_ERROR = -1,
+ DSO_DATA_STATUS_UNKNOWN = 0,
+ DSO_DATA_STATUS_OK = 1,
+};
+
#define DSO__SWAP(dso, type, val) \
({ \
type ____r = val; \
@@ -104,6 +110,7 @@ struct dso {
struct {
struct rb_root cache;
int fd;
+ int status;
size_t file_size;
struct list_head open_entry;
} data;