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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-05-22 13:14:18 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-05-22 13:14:18 -0300 |
| commit | 447a6013e91738c0d4118a7d0c56f235d8623695 (patch) | |
| tree | 3b9e536bbe333c0794c2c3d81e72054f5ee7de4c /tools | |
| parent | 299c345208ae15fbc1e1c96dc1b6ac61e4e5da10 (diff) | |
| download | blackbird-op-linux-447a6013e91738c0d4118a7d0c56f235d8623695.tar.gz blackbird-op-linux-447a6013e91738c0d4118a7d0c56f235d8623695.zip | |
perf tools: Bump default sample freq to 4 kHz
Quoting Ingo:
"While at it I'd also suggest increasing the default sampling frequency,
from 1000 Hz per CPU to at least 4Khz auto-freq or so - this should work
well all across the board I think. CPUs are getting faster and command/app
run times are getting shorter, 1Khz is a bit low IMO."
Requested-by: Ingo Molnar <mingo@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-2jafa6mkrufyekny9ei59lpu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-record.c | 2 | ||||
| -rw-r--r-- | tools/perf/builtin-top.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 9c76add6a03a..e5cb08427e13 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -753,7 +753,7 @@ static struct perf_record record = { .mmap_pages = UINT_MAX, .user_freq = UINT_MAX, .user_interval = ULLONG_MAX, - .freq = 1000, + .freq = 4000, .target = { .uses_mmap = true, }, diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 18bd226f9f2b..6031dce0429f 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1162,7 +1162,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used) struct perf_top top = { .count_filter = 5, .delay_secs = 2, - .freq = 1000, /* 1 KHz */ + .freq = 4000, /* 4 KHz */ .mmap_pages = 128, .sym_pcnt_filter = 5, .target = { |
