linux-kernel - Re: [PATCH v2 4/6] perf/core: Use stable cpuctx->cgrp when update perf cgroup time

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Date:   Tue, 22 Mar 2022 14:03:06 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Chengming Zhou <zhouchengming@...edance.com>
Cc:     mingo@...hat.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, eranian@...gle.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        duanxiongchun@...edance.com, songmuchun@...edance.com
Subject: Re: [PATCH v2 4/6] perf/core: Use stable cpuctx->cgrp when update
 perf cgroup time

On Tue, Mar 22, 2022 at 08:08:32PM +0800, Chengming Zhou wrote:
> The current code use the changeable task->cgroups when update
> the perf cgroup time, which maybe not the active perf_cgroup
> that sched_in on the CPU.

How?!?