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Message-ID: <164614828279.16921.6828134750682486610.tip-bot2@tip-bot2> Date: Tue, 01 Mar 2022 15:24:42 -0000 From: "tip-bot2 for Chengming Zhou" <tip-bot2@...utronix.de> To: linux-tip-commits@...r.kernel.org Cc: Minye Zhu <zhuminye@...edance.com>, Chengming Zhou <zhouchengming@...edance.com>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, Tejun Heo <tj@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org Subject: [tip: sched/core] sched/cpuacct: Fix charge percpu cpuusage The following commit has been merged into the sched/core branch of tip: Commit-ID: 248cc9993d1cc12b8e9ed716cc3fc09f6c3517dd Gitweb: https://git.kernel.org/tip/248cc9993d1cc12b8e9ed716cc3fc09f6c3517dd Author: Chengming Zhou <zhouchengming@...edance.com> AuthorDate: Sun, 20 Feb 2022 13:14:24 +08:00 Committer: Peter Zijlstra <peterz@...radead.org> CommitterDate: Tue, 01 Mar 2022 16:18:37 +01:00 sched/cpuacct: Fix charge percpu cpuusage The cpuacct_account_field() is always called by the current task itself, so it's ok to use __this_cpu_add() to charge the tick time. But cpuacct_charge() maybe called by update_curr() in load_balance() on a random CPU, different from the CPU on which the task is running. So __this_cpu_add() will charge that cputime to a random incorrect CPU. Fixes: 73e6aafd9ea8 ("sched/cpuacct: Simplify the cpuacct code") Reported-by: Minye Zhu <zhuminye@...edance.com> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> Acked-by: Tejun Heo <tj@...nel.org> Link: https://lore.kernel.org/r/20220220051426.5274-1-zhouchengming@bytedance.com --- kernel/sched/cpuacct.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c index 3d06c5e..3078005 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -334,12 +334,13 @@ static struct cftype files[] = { */ void cpuacct_charge(struct task_struct *tsk, u64 cputime) { + unsigned int cpu = task_cpu(tsk); struct cpuacct *ca; rcu_read_lock(); for (ca = task_ca(tsk); ca; ca = parent_ca(ca)) - __this_cpu_add(*ca->cpuusage, cputime); + *per_cpu_ptr(ca->cpuusage, cpu) += cputime; rcu_read_unlock(); }
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