Commit a4f61cc0 authored Aug 07, 2013 by Christoph Lameter Committed by Ingo Molnar Aug 16, 2013

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

Signed-off-by: Ingo 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);
		}