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| author |   Chengming Zhou <zhouchengming@bytedance.com> | 2022-02-20 13:14:24 +0800 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-03-01 16:18:37 +0100 |
| commit | 248cc9993d1cc12b8e9ed716cc3fc09f6c3517dd (patch) | |
| tree | e97bb003738542a43b72421b2f88737f26a62b92 /include/linux/cgroup.h | |
| parent | Merge tag 'v5.17-rc5' into sched/core, to resolve conflicts (diff) | |
| download | linux-dev-248cc9993d1cc12b8e9ed716cc3fc09f6c3517dd.tar.xz linux-dev-248cc9993d1cc12b8e9ed716cc3fc09f6c3517dd.zip | |
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@bytedance.com>
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220220051426.5274-1-zhouchengming@bytedance.com
Diffstat (limited to 'include/linux/cgroup.h')
0 files changed, 0 insertions, 0 deletions