linux-kernel - Re: [PATCH v2] perf stat: Support old kernels for bperf cgroup counting

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Message-ID: <Y0Wfl88objrECjSo@slm.duckdns.org>
Date:   Tue, 11 Oct 2022 06:53:43 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.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, Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH v2] perf stat: Support old kernels for bperf cgroup
 counting

On Mon, Oct 10, 2022 at 10:28:08PM -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.
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>
> Acked-by: Andrii Nakryiko <andrii@...nel.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Applied to cgroup/for-6.1-fixes.

Thanks.

-- 
tejun