From: Namhyung Kim <namhyung@kernel.org>
To: Tejun Heo <tj@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Song Liu <songliubraving@fb.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Zefan Li <lizefan.x@bytedance.com>,
Johannes Weiner <hannes@cmpxchg.org>,
cgroups <cgroups@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-perf-users <linux-perf-users@vger.kernel.org>,
bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH] perf stat: Support old kernels for bperf cgroup counting
Date: Fri, 30 Sep 2022 13:30:18 -0700 [thread overview]
Message-ID: <CAM9d7chMdGwxED8rt6-DWDCnRrbuNAJFFty3i5uqqeTBZJFzTA@mail.gmail.com> (raw)
In-Reply-To: <Yy54CwK84JY/o+Ci@slm.duckdns.org>
On Fri, Sep 23, 2022 at 8:22 PM Tejun Heo <tj@kernel.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@kernel.org>
> > ---
> > Arnaldo, I think this should go through the cgroup tree since it depends
> > on the earlier change there. I don't think it'd conflict with other
> > perf changes but please let me know if you see any trouble, thanks!
>
> FWIW, looks fine to me and I'd be happy to route this through the cgroup
> tree once it gets acked.
Thanks Tejun!
Can any perf + bpf folks take a look?
next prev parent reply other threads:[~2022-09-30 20:30 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-29 19:05 [PATCH cgroup/for-5.20] cgroup: Replace cgroup->ancestor_ids[] with ->ancestors[] Tejun Heo
2022-07-29 20:30 ` Namhyung Kim
2022-07-29 20:58 ` [PATCH v2 " Tejun Heo
2022-07-29 22:42 ` Michal Koutný
2022-07-29 23:02 ` Tejun Heo
2022-07-29 23:10 ` [PATCH v3 " Tejun Heo
2022-08-15 21:17 ` Tejun Heo
2022-09-22 4:05 ` Namhyung Kim
2022-09-22 4:14 ` [PATCH] perf stat: Support old kernels for bperf cgroup counting Namhyung Kim
2022-09-24 3:22 ` Tejun Heo
2022-09-30 20:30 ` Namhyung Kim [this message]
2022-09-30 21:43 ` Jiri Olsa
2022-09-30 21:56 ` Namhyung Kim
2022-09-30 22:00 ` Arnaldo Carvalho de Melo
2022-09-30 22:11 ` Namhyung Kim
2022-10-01 13:57 ` Jiri Olsa
2022-09-30 22:48 ` Andrii Nakryiko
2022-10-01 2:31 ` Namhyung Kim
2022-10-05 22:36 ` Andrii Nakryiko
2022-10-01 13:58 ` Jiri Olsa
2022-10-10 23:59 ` Tejun Heo
2022-10-11 5:24 ` Namhyung Kim
2022-10-11 5:28 ` [PATCH v2] " Namhyung Kim
2022-10-11 16:53 ` Tejun Heo
2022-10-14 13:27 ` Arnaldo Carvalho de Melo
2022-10-14 13:30 ` Arnaldo Carvalho de Melo
2022-10-14 16:40 ` Tejun Heo
2022-10-14 17:10 ` Arnaldo Carvalho de Melo
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