Messages in this thread Patch in this message |  | | | Date | Tue, 6 Dec 2011 12:21:51 -0800 | | From | tip-bot for Glauber Costa <> | | Subject | [tip:sched/core] sched/accounting: Fix user/system tick double accounting |
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Commit-ID: 1c77f38ad623d8c3bc062f0ff9b8c5a2dfb2f1a2 Gitweb: http://git.kernel.org/tip/1c77f38ad623d8c3bc062f0ff9b8c5a2dfb2f1a2 Author: Glauber Costa <glommer@parallels.com> AuthorDate: Fri, 2 Dec 2011 19:58:38 -0200 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Tue, 6 Dec 2011 20:51:23 +0100
sched/accounting: Fix user/system tick double accounting
Now that we're pointing cpuacct's root cgroup to cpustat and accounting through task_group_account_field(), we should not access cpustat directly. Since it is done anyway inside the acessor function, we end up accounting it twice, which is wrong.
Signed-off-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1322863119-14225-2-git-send-email-glommer@parallels.com Signed-off-by: Ingo Molnar <mingo@elte.hu> --- kernel/sched/core.c | 12 ++---------- 1 files changed, 2 insertions(+), 10 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3e078f2..6e86010 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2601,8 +2601,6 @@ static inline void task_group_account_field(struct task_struct *p, void account_user_time(struct task_struct *p, cputime_t cputime, cputime_t cputime_scaled) { - u64 *cpustat = kcpustat_this_cpu->cpustat; - u64 tmp; int index; /* Add user time to process. */ @@ -2610,13 +2608,11 @@ void account_user_time(struct task_struct *p, cputime_t cputime, p->utimescaled = cputime_add(p->utimescaled, cputime_scaled); account_group_user_time(p, cputime); - /* Add user time to cpustat. */ - tmp = cputime_to_cputime64(cputime); - index = (TASK_NICE(p) > 0) ? CPUTIME_NICE : CPUTIME_USER; - cpustat[index] += tmp; + /* Add user time to cpustat. */ task_group_account_field(p, index, cputime); + /* Account for user time used */ acct_update_integrals(p); } @@ -2662,16 +2658,12 @@ static inline void __account_system_time(struct task_struct *p, cputime_t cputime, cputime_t cputime_scaled, int index) { - u64 tmp = cputime_to_cputime64(cputime); - u64 *cpustat = kcpustat_this_cpu->cpustat; - /* Add system time to process. */ p->stime = cputime_add(p->stime, cputime); p->stimescaled = cputime_add(p->stimescaled, cputime_scaled); account_group_system_time(p, cputime); /* Add system time to cpustat. */ - cpustat[index] += tmp; task_group_account_field(p, index, cputime); /* Account for system time used */
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