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sched/cpuacct: Remove redundant NULL checks in cpuacct_acount_field()
This is a micro optimazation for a hot path. - We don't need to check if @ca returned from task_ca() is NULL. - We don't need to check if @ca returned from parent_ca() is NULL. Signed-off-by: Li Zefan <lizefan@huawei.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/515536B7.6060602@huawei.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -237,10 +237,10 @@ void cpuacct_account_field(struct task_struct *p, int index, u64 val)
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rcu_read_lock();
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ca = task_ca(p);
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while (ca && (ca != &root_cpuacct)) {
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while (ca != &root_cpuacct) {
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kcpustat = this_cpu_ptr(ca->cpustat);
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kcpustat->cpustat[index] += val;
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ca = parent_ca(ca);
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ca = __parent_ca(ca);
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}
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rcu_read_unlock();
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}
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@ -34,6 +34,11 @@ static inline struct cpuacct *task_ca(struct task_struct *tsk)
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struct cpuacct, css);
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}
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static inline struct cpuacct *__parent_ca(struct cpuacct *ca)
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{
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return cgroup_ca(ca->css.cgroup->parent);
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}
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static inline struct cpuacct *parent_ca(struct cpuacct *ca)
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{
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if (!ca->css.cgroup->parent)
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