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

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Message-ID: <CALOAHbBA4xjoebNcO2422wa34bgui_=PriPNfJdx2_CstoKQqg@mail.gmail.com>
Date:   Tue, 2 Nov 2021 21:48:10 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.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>,
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        linux-fsdevel@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
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        kernel test robot <oliver.sang@...el.com>,
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Subject: Re: [PATCH v7 00/11] extend task comm from 16 to 24

On Tue, Nov 2, 2021 at 3:56 PM Petr Mladek <pmladek@...e.com> wrote:
>
> On Tue 2021-11-02 09:26:35, Yafang Shao wrote:
> > On Tue, Nov 2, 2021 at 9:18 AM Steven Rostedt <rostedt@...dmis.org> wrote:
> > > On Tue, 2 Nov 2021 09:09:50 +0800
> > > Yafang Shao <laoar.shao@...il.com> wrote:
> > > >      Now we only care about kthread, so we can put the pointer into a
> > > > kthread specific struct.
> > > >      For example in the struct kthread, or in kthread->data (which may
> > > > conflict with workqueue).
> > >
> > > No, add a new field to the structure. "full_name" or something like that.
> > > I'm guessing it should be NULL if the name fits in TASK_COMM_LEN and
> > > allocated if the name had to be truncated.
> > >
> > > Do not overload data with this. That will just make things confusing.
> > > There's not that many kthreads, where an addition of an 8 byte pointer is
> > > going to cause issues.
> >
> > Sure, I will add a new field named "full_name", which only be
> > allocated if the kthread's comm is truncated.
>
> The plan looks good to me.
>
> One more thing. It should obsolete the workqueue-specific solution.
> It would be great to clean up the workqueue code as the next step.
>

Agreed. The worker comm can be replaced by the new kthread full_name.
I will do it in the next step.

-- 
Thanks
Yafang