linux-kernel - [tip:sched/core] sched/cpuacct: Allocate per_cpu cpuusage for root cpuacct statically

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Message-ID: <tip-7943e15a3e91db78a7a3fbc84e45cf9d1c7c7d23@git.kernel.org>
Date:	Wed, 10 Apr 2013 06:44:56 -0700
From:	tip-bot for Li Zefan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, tj@...nel.org, tglx@...utronix.de,
	lizefan@...wei.com
Subject: [tip:sched/core] sched/cpuacct:
  Allocate per_cpu cpuusage for root cpuacct statically

Commit-ID:  7943e15a3e91db78a7a3fbc84e45cf9d1c7c7d23
Gitweb:     http://git.kernel.org/tip/7943e15a3e91db78a7a3fbc84e45cf9d1c7c7d23
Author:     Li Zefan <lizefan@...wei.com>
AuthorDate: Fri, 29 Mar 2013 14:43:46 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 10 Apr 2013 13:54:20 +0200

sched/cpuacct: Allocate per_cpu cpuusage for root cpuacct statically

This is a preparation, so later we can initialize cpuacct
earlier.

Signed-off-by: Li Zefan <lizefan@...wei.com>
Cc: Tejun Heo <tj@...nel.org>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/51553822.5000403@huawei.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/cpuacct.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 9305fd2..a691c4d 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -58,6 +58,7 @@ static inline struct cpuacct *parent_ca(struct cpuacct *ca)
 	return cgroup_ca(ca->css.cgroup->parent);
 }
 
+static DEFINE_PER_CPU(u64, root_cpuacct_cpuusage);
 static struct cpuacct root_cpuacct;
 
 /* create a new cpu accounting group */
@@ -290,8 +291,7 @@ void cpuacct_account_field(struct task_struct *p, int index, u64 val)
 void __init cpuacct_init(void)
 {
 	root_cpuacct.cpustat = &kernel_cpustat;
-	root_cpuacct.cpuusage = alloc_percpu(u64);
-	BUG_ON(!root_cpuacct.cpuusage); /* Too early, not expected to fail */
+	root_cpuacct.cpuusage = &root_cpuacct_cpuusage;
 }
 
 struct cgroup_subsys cpuacct_subsys = {
--
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