linux-kernel - Re: [PATCH] perf stat: Support old kernels for bperf cgroup counting

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Date:   Mon, 10 Oct 2022 22:24:17 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Song Liu <songliubraving@...com>,
        bpf@...r.kernel.org
Subject: Re: [PATCH] perf stat: Support old kernels for bperf cgroup counting

Hi Tejun,

On Mon, Oct 10, 2022 at 4:59 PM Tejun Heo <tj@...nel.org> wrote:
>
> On Wed, Sep 21, 2022 at 09:14:35PM -0700, Namhyung Kim wrote:
> > The recent change in the cgroup will break the backward compatiblity in
> > the BPF program.  It should support both old and new kernels using BPF
> > CO-RE technique.
> >
> > Like the task_struct->__state handling in the offcpu analysis, we can
> > check the field name in the cgroup struct.
> >
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>
> Looks like it's acked enough but the patch doesn't apply anymore. Namhyung,
> can you please refresh the patch? I'll route this through
> cgroup/for-6.1-fixes unless somebody objects.

Sorry about the conflict.  There was another change to get the perf
cgroup subsys id properly.  Will send v2 soon.

Thanks,
Namhyung