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sched/cpuacct: Allocate per_cpu cpuusage for root cpuacct statically

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

Signed-off-by: Li Zefan <lizefan@huawei.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/51553822.5000403@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Li Zefan 2013-03-29 14:43:46 +08:00 committed by Ingo Molnar
parent d1712796a8
commit 7943e15a3e
1 changed files with 2 additions and 2 deletions
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4
kernel/sched/cpuacct.c
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@ -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 = {