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From: Al Viro <viro@zeniv.linux.org.uk>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: akpm@linux-foundation.org, pmladek@suse.com,
	peterz@infradead.org, valentin.schneider@arm.com,
	keescook@chromium.org, mathieu.desnoyers@efficios.com,
	qiang.zhang@windriver.com, robdclark@chromium.org,
	christian@brauner.io, dietmar.eggemann@arm.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/5] kthread: increase the size of kthread's comm
Date: Sun, 3 Oct 2021 03:41:29 +0000	[thread overview]
Message-ID: <YVkmaSUxbg/JtBHb@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <20210929115036.4851-1-laoar.shao@gmail.com>

On Wed, Sep 29, 2021 at 11:50:31AM +0000, Yafang Shao wrote:

> That motivates me to do this improvement.
> 
> This patch increases the size of ktread's comm from 16 to 24, which is
> the same with workqueue's. After this change, the name of kthread can be
> fully displayed in /proc/[pid]/comm, for example,
>     
>     rcu_tasks_kthread
>     rcu_tasks_rude_kthread
>     rcu_tasks_trace_kthread
>     ecryptfs-kthread
>     vfio-irqfd-cleanup
>     ext4-rsv-conversion
>     jbd2/nvme0n1p2-8
>     ...
>     
> Because there're only a few of kthreads, so it won't increase too much
> memory consumption.

That's a bloody massive overkill.  If you care about /proc/*/comm, you
might want to take a look at the function that generates its contents:

void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
{
        char tcomm[64];

        if (p->flags & PF_WQ_WORKER)
                wq_worker_comm(tcomm, sizeof(tcomm), p);
        else   
                __get_task_comm(tcomm, sizeof(tcomm), p);

        if (escape)
                seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
        else   
                seq_printf(m, "%.64s", tcomm);
}

Hint: it's not always p->comm verbatim...

  parent reply	other threads:[~2021-10-03  3:43 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29 11:50 Yafang Shao
2021-09-29 11:50 ` [PATCH 1/5] kernel: replace sizeof(task->comm) with TASK_COMM_LEN Yafang Shao
2021-09-29 18:09   ` Kees Cook
2021-09-30 12:27     ` Yafang Shao
2021-10-03  3:31   ` Al Viro
2021-10-03 14:14     ` Yafang Shao
2021-09-29 11:50 ` [PATCH 2/5] kernel/fork: allocate task->comm dynamicly Yafang Shao
2021-09-29 13:08   ` Yafang Shao
2021-09-29 18:11   ` Kees Cook
2021-09-30 12:41     ` Yafang Shao
2021-09-30 14:51       ` Petr Mladek
2021-10-01 11:58         ` Yafang Shao
2021-09-29 11:50 ` [PATCH 3/5] kernel/sched: improve the BUILD_BUG_ON() in get_task_comm() Yafang Shao
2021-09-29 18:12   ` Kees Cook
2021-09-30 12:43     ` Yafang Shao
2021-09-29 11:50 ` [PATCH 4/5] kernel: increase the size of kthread's comm Yafang Shao
2021-09-29 18:19   ` Kees Cook
2021-09-30 12:53     ` Yafang Shao
2021-09-29 11:50 ` [PATCH 5/5] kernel/kthread: show a warning if kthread's comm is still trucated Yafang Shao
2021-09-29 18:20   ` Kees Cook
2021-09-30 12:54     ` Yafang Shao
2021-09-30 15:17   ` Petr Mladek
2021-10-01 11:59     ` Yafang Shao
2021-10-03  3:41 ` Al Viro [this message]
2021-10-03 14:20   ` [PATCH 0/5] kthread: increase the size of kthread's comm Yafang Shao

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