perf tools: Bump default sample freq to 4 kHz
Commit-ID: 447a6013e91738c0d4118a7d0c56f235d8623695 Gitweb: http://git.kernel.org/tip/447a6013e91738c0d4118a7d0c56f235d8623695 Author: Arnaldo Carvalho de Melo <[email protected]> AuthorDate: Tue, 22 May 2012 13:14:18 -0300 Committer: Arnaldo Carvalho de Melo <[email protected]> CommitDate: Tue, 22 May 2012 13:14:18 -0300
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 <[email protected]>
Cc David Ahern <[email protected]>
Cc Frederic Weisbecker <[email protected]>
Cc Mike Galbraith <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Paul Mackerras <[email protected]>
Cc Peter Zijlstra <[email protected]>
Cc Stephane Eranian <[email protected]>
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
--- tools/perf/builtin-record.c | 2 +- tools/perf/builtin-top.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
tools/perf/builtin-record.c +1 -1
@@ -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, },
tools/perf/builtin-top.c +1 -1
@@ -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 = {