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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>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-02-26 15:40:15 +08:00 committed by Ingo Molnar
parent 4434e51564
commit c40c6f85a7
1 changed files with 1 additions and 1 deletions
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2
kernel/sched.c
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@ -9684,7 +9684,7 @@ 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);