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

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Message-ID: <YYDvHv76tJtJht8b@alley>
Date:   Tue, 2 Nov 2021 08:56:14 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Yafang Shao <laoar.shao@...il.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>,
        "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 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.

Best Regards,
Petr