linux-kernel - Re: [PATCH v2 3/6] perf/core: Don't pass task around when ctx sched in

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Date:   Tue, 22 Mar 2022 14:01:59 +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 3/6] perf/core: Don't pass task around when ctx sched
 in

On Tue, Mar 22, 2022 at 08:08:31PM +0800, Chengming Zhou wrote:
> The current code pass task around for ctx_sched_in(), only
> to get perf_cgroup of the task, then update the timestamp
> of it and its ancestors and set them to active.
> 
> But we can use cpuctx->cgrp to get active perf_cgroup and
> its ancestors since cpuctx->cgrp has been set before
> ctx_sched_in().
> 
> This patch remove the task argument in ctx_sched_in()
> and cleanup related code.
> 
> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>

Yeah, this looks reasonable I suppose...