Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 18/19] perf tools: Store PERF_RECORD_FINISHED_ROUND only for nonempty rounds | Date | Fri, 25 Jul 2014 16:56:16 +0200 |
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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.
Cc: Arnaldo Carvalho de Melo <acme@kernel.org> 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> Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- tools/perf/builtin-record.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
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; -- 1.8.3.1
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