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

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Message-ID: <Y0Sx2KWX4gPlLytq@slm.duckdns.org>
Date:   Mon, 10 Oct 2022 13:59:20 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Namhyung Kim <namhyung@...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

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.

Thanks.

-- 
tejun