Messages in this thread | | | From | Namhyung Kim <> | Date | Tue, 22 Mar 2022 15:21:51 -0700 | Subject | Re: [PATCH v2 2/6] perf/core: Introduce percpu perf_cgroup |
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On Tue, Mar 22, 2022 at 6:01 AM Peter Zijlstra <peterz@infradead.org> wrote: > > On Tue, Mar 22, 2022 at 08:08:30PM +0800, Chengming Zhou wrote: > > Although we don't have incosistency problem any more, we can > > have other problem like: > > > > CPU1 CPU2 > > (in context_switch) (attach running task) > > prev->cgroups = cgrp2 > > perf_cgroup_sched_switch(prev, next) > > cgrp2 == cgrp2 is True > > > > Again, I'm not following, how can you attach to a running task from > another CPU ?
I think it's supported from the beginning by writing PID to a file in the cgroupfs.
Thanks, Namhyung
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