linux-kernel - Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM

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Date:   Sun, 12 Feb 2023 11:19:48 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Qais Yousef <qyousef@...alina.io>
Cc:     Kajetan Puchalski <kajetan.puchalski@....com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        John Stultz <jstultz@...gle.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel test robot <oliver.sang@...el.com>,
        kbuild test robot <lkp@...el.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Michal Miroslaw <mirq-linux@...e.qmqm.pl>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Lukasz Luba <lukasz.luba@....com>,
        Qais Yousef <qyousef@...gle.com>,
        Daniele Di Proietto <ddiproietto@...gle.com>
Subject: Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16
 with TASK_COMM_LEN

On Sun, Feb 12, 2023 at 12:51 AM Qais Yousef <qyousef@...alina.io> wrote:
>
> On 02/09/23 23:37, Yafang Shao wrote:
> > On Thu, Feb 9, 2023 at 10:28 PM Kajetan Puchalski
> > <kajetan.puchalski@....com> wrote:
> > >
> > > On Thu, Feb 09, 2023 at 02:20:36PM +0800, Yafang Shao wrote:
> > >
> > > [...]
> > >
> > > Hi Yafang,
> > >
> > > > Many thanks for the detailed analysis. Seems it can work.
> > > >
> > > > Hi John,
> > > >
> > > > Could you pls. try the attached fix ? I have verified it in my test env.
> > >
> > > I tested the patch on my environment where I found the issue with newer
> > > kernels + older Perfetto. The patch does improve things so that's nice.
> >
> > Thanks for the test. I don't have Perfetto in hand, so I haven't
> > verify Perfetto.
>
> FWIW, perfetto is not android specific and can run on normal linux distro setup
> (which I do but haven't noticed this breakage).
>
> It's easy to download the latest release (including for android though I never
> tried that) from github
>
>         https://github.com/google/perfetto/releases
>

Thanks for the information. I will try to run it on my test env.
I suspect the "systrace_parse_failure" error is caused by the field we
introduced into struct ftrace_event_field in the proposed patch, but I
haven't taken a deep look at the perfetto src code yet.

> Kajetan might try to see if he can pick the latest version which IIUC contains
> a workaround.
>
> If this simple patch can be tweaked to make it work again against older
> versions that'd be nice though.
>
> HTH.
>
>
> Cheers
>
> --
> Qais Yousef



-- 
Regards
Yafang