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