linux-kernel - Re: [PATCH v7 00/11] extend task comm from 16 to 24

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Date:   Mon, 1 Nov 2021 21:12:15 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Valentin Schneider <valentin.schneider@....com>,
        Qiang Zhang <qiang.zhang@...driver.com>,
        robdclark <robdclark@...omium.org>,
        christian <christian@...uner.io>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        dennis.dalessandro@...nelisnetworks.com,
        mike.marciniszyn@...nelisnetworks.com, dledford@...hat.com,
        jgg@...pe.ca, linux-rdma@...r.kernel.org,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        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>
Subject: Re: [PATCH v7 00/11] extend task comm from 16 to 24

On Mon, Nov 1, 2021 at 8:46 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Nov 01, 2021 at 06:04:08AM +0000, Yafang Shao wrote:
> > There're many truncated kthreads in the kernel, which may make trouble
> > for the user, for example, the user can't get detailed device
> > information from the task comm.
> >
> > This patchset tries to improve this problem fundamentally by extending
> > the task comm size from 16 to 24, which is a very simple way.
>
> It can't be that simple if we're on v7 and at 11 patches!
>

Most of the changes are because of hard-coded 16 that can't be easily grepped.
In these 11 patches, patch #1, #2, #4, #5, #6, #7 and #9 are cleanups,
which can be a different patchset.

The core changes of these patchset are patch #3, #8 and #10.

#11 can also be a seperate patch.

> It would be helpful if you included links to earlier postings.  I can
> only find v5 and v6 in my inbox, so I fear I'm going to re-ask some
> questions which were already answered.
>

v1: https://lore.kernel.org/lkml/20210929115036.4851-1-laoar.shao@gmail.com/
v2: https://lore.kernel.org/lkml/20211007120752.5195-1-laoar.shao@gmail.com/
v3: https://lore.kernel.org/lkml/20211010102429.99577-1-laoar.shao@gmail.com/
v4: https://lore.kernel.org/lkml/20211013102346.179642-1-laoar.shao@gmail.com/
v5: https://lore.kernel.org/lkml/20211021034516.4400-1-laoar.shao@gmail.com/
v6: https://lore.kernel.org/lkml/20211025083315.4752-1-laoar.shao@gmail.com/


> Why can't we shorten the names of these kthreads?  You didn't
> give any examples, so I can't suggest any possibilities.
>

Take 'jbd2/nvme0n1p2-' for example, that's a nice name, which gives a
good description via the name.
And I don't think it is a good idea to shorten its name.

-- 
Thanks
Yafang