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>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 9c76add..e5cb084 100644 (file)
--- 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 (file)
--- 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              = {