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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>
This commit is contained in:
Christoph Lameter 2013-08-07 15:38:24 +00:00 committed by Ingo Molnar
parent c8d2d47a9c
commit a4f61cc03e
1 changed files with 1 additions and 1 deletions
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kernel/sched/cputime.c
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@ -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. * 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); cpuacct_account_field(p, index, tmp);
} }