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

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Date:   Sat, 11 Feb 2023 16:51:20 +0000
From:   Qais Yousef <qyousef@...alina.io>
To:     Yafang Shao <laoar.shao@...il.com>
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 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

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