From: tip-bot for Arnaldo Carvalho de Melo <acme@redhat.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, eranian@google.com,
paulus@samba.org, acme@redhat.com, hpa@zytor.com,
mingo@kernel.org, peterz@infradead.org, efault@gmx.de,
namhyung@gmail.com, fweisbec@gmail.com, dsahern@gmail.com,
tglx@linutronix.de
Subject: [tip:perf/core] perf tools: Bump default sample freq to 4 kHz
Date: Wed, 23 May 2012 08:31:30 -0700 [thread overview]
Message-ID: <tip-2jafa6mkrufyekny9ei59lpu@git.kernel.org> (raw)
Commit-ID: 447a6013e91738c0d4118a7d0c56f235d8623695
Gitweb: http://git.kernel.org/tip/447a6013e91738c0d4118a7d0c56f235d8623695
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Tue, 22 May 2012 13:14:18 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
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 <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>
---
tools/perf/builtin-record.c | 2 +-
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 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 = {
reply other threads:[~2012-05-23 15:31 UTC|newest]
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