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perf record: Store PERF_RECORD_FINISHED_ROUND only for nonempty rounds

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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>
This commit is contained in:
Jiri Olsa 2014-07-25 16:56:16 +02:00 committed by Arnaldo Carvalho de Melo
parent 33bf748197
commit dcabb507fd
1 changed files with 7 additions and 1 deletions
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8
tools/perf/builtin-record.c
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@ -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;