Commit-ID: a4f61cc03e443647211a5ae0ab8f8cda2e9e1043 Gitweb: http://git.kernel.org/tip/a4f61cc03e443647211a5ae0ab8f8cda2e9e1043 Author: Christoph Lameter <[email protected]> AuthorDate: Wed, 7 Aug 2013 15:38:24 +0000 Committer: Ingo Molnar <[email protected]> CommitDate: Fri, 16 Aug 2013 17:44:29 +0200
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 <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/00000140596dd165-338ff7f5-893b-4fec-b251-aaac5557239e-000...@email.amazonses.com Signed-off-by: Ingo Molnar <[email protected]> --- kernel/sched/cputime.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
