Commit c40c6f85 authored Feb 26, 2009 by Li Zefan Committed by Ingo Molnar Feb 26, 2009

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>

parent 4434e515

kernel/sched.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);