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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2012-05-22 13:14:18 -03:00
parent 299c345208
commit 447a6013e9
2 changed files with 2 additions and 2 deletions
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2
tools/perf/builtin-record.c
View File

@ -753,7 +753,7 @@ static struct perf_record record = {
.mmap_pages = UINT_MAX, .mmap_pages = UINT_MAX,
.user_freq = UINT_MAX, .user_freq = UINT_MAX,
.user_interval = ULLONG_MAX, .user_interval = ULLONG_MAX,
.freq = 1000, .freq = 4000,
.target = { .target = {
.uses_mmap = true, .uses_mmap = true,
}, },

2
tools/perf/builtin-top.c
View File

@ -1162,7 +1162,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
struct perf_top top = { struct perf_top top = {
.count_filter = 5, .count_filter = 5,
.delay_secs = 2, .delay_secs = 2,
.freq = 1000, /* 1 KHz */ .freq = 4000, /* 4 KHz */
.mmap_pages = 128, .mmap_pages = 128,
.sym_pcnt_filter = 5, .sym_pcnt_filter = 5,
.target = { .target = {