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Commit a4f61cc0 authored by Christoph Lameter's avatar Christoph Lameter Committed by Ingo Molnar
Browse files

sched/cputime: Use this_cpu_add() in task_group_account_field() 



Use of a this_cpu() operation reduces the number of instructions used
for accounting (account_user_time()) and frees up some registers. This is in
the scheduler tick hotpath.

Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/00000140596dd165-338ff7f5-893b-4fec-b251-aaac5557239e-000000@email.amazonses.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent c8d2d47a

kernel/sched/cputime.c

+1 −1
Original line number Diff line number Diff line
@@ -121,7 +121,7 @@ static inline void task_group_account_field(struct task_struct *p, int index, 
	 * is the only cgroup, then nothing else should be necessary.

	 *

	 */

	__get_cpu_var(kernel_cpustat).cpustat[index] += tmp;

	__this_cpu_add(kernel_cpustat.cpustat[index], tmp);



	cpuacct_account_field(p, index, tmp);

}