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authorRuss Anderson <rja@sgi.com>2010-05-18 17:52:40 -0500
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-05-20 21:53:58 -0300
commitef365cefbc53d8674a18520a1d4c2e5590127299 (patch)
tree75566178dedd11a685d4240523849ad6787fb549 /tools/perf/builtin-record.c
parentdfacc4d6c98b89609250269f518c1f54c30454ef (diff)
downloadlinux-2.6.34-ux500-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>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 66b8ecd22cf..e6722698183 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++;