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authorJiri Olsa <jolsa@kernel.org>2014-07-25 16:56:16 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-07-25 12:17:36 -0300
commitdcabb507fd3a2b19aed6b4068e2a954f5fd8de45 (patch)
tree7b6a25848d195c28b701f3cfead9bd3bca69e54c /tools
parent33bf7481971a622a2b8c8aaa0e5e61a6eaeecd71 (diff)
downloadlinux-dcabb507fd3a2b19aed6b4068e2a954f5fd8de45.tar.bz2
perf record: Store PERF_RECORD_FINISHED_ROUND only for nonempty rounds
Currently we store PERF_RECORD_FINISHED_ROUND event each time we go throught mmap buffers no matter if it contains any data, which is useless. Forcing the PERF_RECORD_FINISHED_ROUND event to be stored any time we finished the round AND wrote at least one event. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: David Ahern <dsahern@gmail.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1406300177-31805-19-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-record.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4a1a54265b04..4869050e7194 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -238,6 +238,7 @@ static struct perf_event_header finished_round_event = {
static int record__mmap_read_all(struct record *rec)
{
+ u64 bytes_written = rec->bytes_written;
int i;
int rc = 0;
@@ -250,7 +251,12 @@ static int record__mmap_read_all(struct record *rec)
}
}
- rc = record__write(rec, &finished_round_event, sizeof(finished_round_event));
+ /*
+ * Mark the round finished in case we wrote
+ * at least one event.
+ */
+ if (bytes_written != rec->bytes_written)
+ rc = record__write(rec, &finished_round_event, sizeof(finished_round_event));
out:
return rc;