linux-kernel - [tip:perf/urgent] perf record: Use per-task-per-cpu events for inherited events

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Date:	Wed, 16 Dec 2009 17:34:30 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, acme@...hat.com,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf record: Use per-task-per-cpu events for inherited events

Commit-ID:  60ab271617cec607380099f3ed8e84916e48323b
Gitweb:     http://git.kernel.org/tip/60ab271617cec607380099f3ed8e84916e48323b
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 16 Dec 2009 17:55:56 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 16 Dec 2009 18:30:13 +0100

perf record: Use per-task-per-cpu events for inherited events

Create events with a pid and cpu contraint for inherited events
so that we get a stream per cpu, instead of all cpus contending
on a single stream.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: fweisbec@...il.com
Cc: Paul Mackerras <paulus@...ba.org>
LKML-Reference: <20091216165904.987643843@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/builtin-record.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 9b7c6d8..63136d0 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -278,7 +278,7 @@ static void create_counter(int counter, int cpu, pid_t pid)
 
 	attr->mmap		= track;
 	attr->comm		= track;
-	attr->inherit		= (cpu < 0) && inherit;
+	attr->inherit		= inherit;
 	attr->disabled		= 1;
 
 try_again:
@@ -537,7 +537,7 @@ static int __cmd_record(int argc __used, const char **argv)
 	}
 
 
-	if (!system_wide || profile_cpu != -1) {
+	if ((!system_wide && !inherit) || profile_cpu != -1) {
 		open_counters(profile_cpu, target_pid);
 	} else {
 		for (i = 0; i < nr_cpus; i++)
--
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