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sched/accounting: Fix user/system tick double accounting

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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>
This commit is contained in:
Glauber Costa 2011-12-02 19:58:38 -02:00 committed by Ingo Molnar
parent 54c707e98d
commit 1c77f38ad6
1 changed files with 2 additions and 10 deletions
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12
kernel/sched/core.c
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@ -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 */