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| author | Christoph Lameter <cl@gentwo.org> | 2013-08-07 15:38:24 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-08-16 17:44:29 +0200 |
| commit | a4f61cc03e443647211a5ae0ab8f8cda2e9e1043 (patch) | |
| tree | 6285945a10b8bf718d27fecd7d4bc33e21a0a861 /kernel/sched/cputime.c | |
| parent | c8d2d47a9cbb4222ae4e993aa0e3703430c8193c (diff) | |
| download | op-kernel-dev-a4f61cc03e443647211a5ae0ab8f8cda2e9e1043.zip op-kernel-dev-a4f61cc03e443647211a5ae0ab8f8cda2e9e1043.tar.gz | |
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>
Diffstat (limited to 'kernel/sched/cputime.c')
| -rw-r--r-- | kernel/sched/cputime.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index a7959e0..e89ccef 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -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); } |
