linux-kernel - [tip:sched/urgent] sched: Reset sched stats on fork()

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Date:	Fri, 10 Jul 2009 10:41:14 GMT
From:	tip-bot for Lucas De Marchi <lucas.de.marchi@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, lucas.de.marchi@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/urgent] sched: Reset sched stats on fork()

Commit-ID:  7793527b90d9418211f4fe8464cc1dcb1631ea1b
Gitweb:     http://git.kernel.org/tip/7793527b90d9418211f4fe8464cc1dcb1631ea1b
Author:     Lucas De Marchi <lucas.de.marchi@...il.com>
AuthorDate: Thu, 9 Jul 2009 13:57:20 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 10 Jul 2009 10:43:29 +0200

sched: Reset sched stats on fork()

The sched_stat fields are currently not reset upon fork.
Ingo's recent commit 6c594c21fcb02c662f11c97be4d7d2b73060a205
did reset nr_migrations, but it didn't reset any of the
others.

This patch resets all sched_stat fields on fork.

Signed-off-by: Lucas De Marchi <lucas.de.marchi@...il.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <193b0f820907090457s7a3662f4gcdecdc22fcae857b@...l.gmail.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/sched.c |   40 +++++++++++++++++++++++++++++++---------
 1 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index a17f3d9..c4549bd 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2572,15 +2572,37 @@ static void __sched_fork(struct task_struct *p)
 	p->se.avg_wakeup		= sysctl_sched_wakeup_granularity;
 
 #ifdef CONFIG_SCHEDSTATS
-	p->se.wait_start		= 0;
-	p->se.sum_sleep_runtime		= 0;
-	p->se.sleep_start		= 0;
-	p->se.block_start		= 0;
-	p->se.sleep_max			= 0;
-	p->se.block_max			= 0;
-	p->se.exec_max			= 0;
-	p->se.slice_max			= 0;
-	p->se.wait_max			= 0;
+	p->se.wait_start			= 0;
+	p->se.wait_max				= 0;
+	p->se.wait_count			= 0;
+	p->se.wait_sum				= 0;
+
+	p->se.sleep_start			= 0;
+	p->se.sleep_max				= 0;
+	p->se.sum_sleep_runtime			= 0;
+
+	p->se.block_start			= 0;
+	p->se.block_max				= 0;
+	p->se.exec_max				= 0;
+	p->se.slice_max				= 0;
+
+	p->se.nr_migrations_cold		= 0;
+	p->se.nr_failed_migrations_affine	= 0;
+	p->se.nr_failed_migrations_running	= 0;
+	p->se.nr_failed_migrations_hot		= 0;
+	p->se.nr_forced_migrations		= 0;
+	p->se.nr_forced2_migrations		= 0;
+
+	p->se.nr_wakeups			= 0;
+	p->se.nr_wakeups_sync			= 0;
+	p->se.nr_wakeups_migrate		= 0;
+	p->se.nr_wakeups_local			= 0;
+	p->se.nr_wakeups_remote			= 0;
+	p->se.nr_wakeups_affine			= 0;
+	p->se.nr_wakeups_affine_attempts	= 0;
+	p->se.nr_wakeups_passive		= 0;
+	p->se.nr_wakeups_idle			= 0;
+
 #endif
 
 	INIT_LIST_HEAD(&p->rt.run_list);
--
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