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| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-02-26 15:40:15 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-26 13:22:38 +0100 |
| commit | c40c6f85a7594ad842233885386a0ca4cd40eafe (patch) | |
| tree | c04285769854afb32bb9d97224eb0a27f40b343c /kernel/sched.c | |
| parent | 4434e5156409eb3ec98f5ad7f0a0c07ebafe970d (diff) | |
| download | lwn-c40c6f85a7594ad842233885386a0ca4cd40eafe.tar.gz lwn-c40c6f85a7594ad842233885386a0ca4cd40eafe.zip | |
cpuacct: add a branch prediction
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>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 5475d56a20f1..8e63ffb6ed05 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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); |