linux-kernel - [PATCH] perf/sched: fix for getting task's execute time

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Message-ID: <4B1B8E0E.3040007@cn.fujitsu.com>
Date:	Sun, 06 Dec 2009 18:57:18 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] perf/sched: fix for getting task's execute time

In current code, we get task's execute time by reading
"/proc/<pid>/sched" file, it's wrong if the task is created
by pthread_create(), because every thread task has same pid.
So, the correct way is reading "/proc/<ppid>/task/<tid>/sched"
file.

This patch also remove redundant include files since <sys/types.h>
is included in "perf.h"

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
---
 tools/perf/builtin-sched.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 26b782f..b2e910e 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -13,7 +13,6 @@
 #include "util/debug.h"
 #include "util/data_map.h"
 
-#include <sys/types.h>
 #include <sys/prctl.h>
 
 #include <semaphore.h>
@@ -416,7 +415,7 @@ static u64 get_cpu_usage_nsec_parent(void)
 
 static u64 get_cpu_usage_nsec_self(void)
 {
-	char filename [] = "/proc/1234567890/sched";
+	char filename [] = "/proc/1234567890/task/1234567890/sched";
 	unsigned long msecs, nsecs;
 	char *line = NULL;
 	u64 total = 0;
@@ -425,7 +424,9 @@ static u64 get_cpu_usage_nsec_self(void)
 	FILE *file;
 	int ret;
 
-	sprintf(filename, "/proc/%d/sched", getpid());
+	sprintf(filename, "/proc/%d/task/%d/sched", getpid(),
+		(pid_t)syscall(SYS_gettid));
+
 	file = fopen(filename, "r");
 	BUG_ON(!file);
 
-- 
1.6.1.2


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