diff options
| author | Russ Anderson <rja@sgi.com> | 2010-05-18 17:52:40 -0500 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-05-20 21:53:58 -0300 |
| commit | ef365cefbc53d8674a18520a1d4c2e5590127299 (patch) | |
| tree | 75566178dedd11a685d4240523849ad6787fb549 | |
| parent | dfacc4d6c98b89609250269f518c1f54c30454ef (diff) | |
| download | op-kernel-dev-ef365cefbc53d8674a18520a1d4c2e5590127299.zip op-kernel-dev-ef365cefbc53d8674a18520a1d4c2e5590127299.tar.gz | |
perf record: remove unneeded gettimeofday() call
Perf record repeatedly calls gettimeofday() which adds noise to the performance
measurements. Since gettimeofday() is only used for the error printf, delete
it.
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <20100518225240.GC25589@sgi.com>
Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/builtin-record.c | 17 |
1 files changed, 1 insertions, 16 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 66b8ecd..e672269 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -65,9 +65,6 @@ static bool multiplex = false; static int multiplex_fd = -1; static long samples = 0; -static struct timeval last_read; -static struct timeval this_read; - static u64 bytes_written = 0; static struct pollfd *event_array; @@ -147,8 +144,6 @@ static void mmap_read(struct mmap_data *md) void *buf; int diff; - gettimeofday(&this_read, NULL); - /* * If we're further behind than half the buffer, there's a chance * the writer will bite our tail and mess up the samples under us. @@ -159,23 +154,13 @@ static void mmap_read(struct mmap_data *md) */ diff = head - old; if (diff < 0) { - struct timeval iv; - unsigned long msecs; - - timersub(&this_read, &last_read, &iv); - msecs = iv.tv_sec*1000 + iv.tv_usec/1000; - - fprintf(stderr, "WARNING: failed to keep up with mmap data." - " Last read %lu msecs ago.\n", msecs); - + fprintf(stderr, "WARNING: failed to keep up with mmap data\n"); /* * head points to a known good entry, start there. */ old = head; } - last_read = this_read; - if (old != head) samples++; |
