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| author | Jiri Olsa <jolsa@kernel.org> | 2014-07-25 16:56:16 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-07-25 17:17:36 +0200 |
| commit | dcabb507fd3a2b19aed6b4068e2a954f5fd8de45 (patch) | |
| tree | 7b6a25848d195c28b701f3cfead9bd3bca69e54c | |
| parent | perf record: Always force PERF_RECORD_FINISHED_ROUND event (diff) | |
| download | linux-dcabb507fd3a2b19aed6b4068e2a954f5fd8de45.tar.xz linux-dcabb507fd3a2b19aed6b4068e2a954f5fd8de45.zip | |
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>
| -rw-r--r-- | tools/perf/builtin-record.c | 8 |
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; |