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authorArnaldo Carvalho de Melo <acme@redhat.com>2012-05-22 13:14:18 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-05-22 13:14:18 -0300
commit447a6013e91738c0d4118a7d0c56f235d8623695 (patch)
tree3b9e536bbe333c0794c2c3d81e72054f5ee7de4c /tools
parent299c345208ae15fbc1e1c96dc1b6ac61e4e5da10 (diff)
downloadop-kernel-dev-447a6013e91738c0d4118a7d0c56f235d8623695.zip
op-kernel-dev-447a6013e91738c0d4118a7d0c56f235d8623695.tar.gz
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.c2
-rw-r--r--tools/perf/builtin-top.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 9c76add..e5cb084 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 18bd226..6031dce 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 = {
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