Messages in this thread Patch in this message | | | Date | Thu, 26 Feb 2009 15:40:15 +0800 | From | Li Zefan <> | Subject | [PATCH] cpuacct: add a branch prediction |
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cpuacct_charge() is in fast-path, and checking of !cpuacct_susys.active always returns false after cpuacct has been initialized at system boot.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> --- kernel/sched.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index 410eec4..fd2f7fc 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -9589,7 +9589,7 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime) struct cpuacct *ca; int cpu; - if (!cpuacct_subsys.active) + if (unlikely(!cpuacct_subsys.active)) return; cpu = task_cpu(tsk); -- 1.5.4.rc3
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