[PATCH] sched/cpuacct:Fix previous bugs submitted in history.

[PATCH] sched/cpuacct:Fix previous bugs submitted in history.

[ning.le]

Historical submission introduces new issues that When the current cpu
wakes up the thread which works on other cores,the cpuacct module may
add the execution time of thread which on the the other core's rq to
the current core's cpuusage.

Signed-off-by: ning.le <ning.le@h3c.com>
---
 kernel/sched/cpuacct.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 941c28cf9738..bd38c9cffdd6 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -341,6 +341,7 @@ void cpuacct_charge(struct task_struct *tsk, u64 cputime)
        struct cpuacct *ca;
        int index = CPUACCT_STAT_SYSTEM;
        struct pt_regs *regs = get_irq_regs() ? : task_pt_regs(tsk);
+ int cpu = task_cpu(tsk);

        if (regs && user_mode(regs))
                index = CPUACCT_STAT_USER;
@@ -348,8 +349,7 @@ void cpuacct_charge(struct task_struct *tsk, u64 cputime)
        rcu_read_lock();

        for (ca = task_ca(tsk); ca; ca = parent_ca(ca))
-               __this_cpu_add(ca->cpuusage->usages[index], cputime);
-
+   per_cpu_ptr(ca->cpuusage, cpu)->usages[index] += cputime;
        rcu_read_unlock();
 }

--
2.17.1

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