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From: Linus Torvalds <torvalds@linux-foundation.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Jens Axboe <axboe@kernel.dk>, io-uring <io-uring@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Oleg Nesterov <oleg@redhat.com>,
	Stefan Metzmacher <metze@samba.org>
Subject: Re: [PATCH 0/2] Don't show PF_IO_WORKER in /proc/<pid>/task/
Date: Thu, 25 Mar 2021 12:38:54 -0700	[thread overview]
Message-ID: <CAHk-=wjOXiEAjGLbn2mWRsxqpAYUPcwCj2x5WgEAh=gj+o0t4Q@mail.gmail.com> (raw)
In-Reply-To: <m1ft0j3u5k.fsf@fess.ebiederm.org>

On Thu, Mar 25, 2021 at 12:34 PM Eric W. Biederman
<ebiederm@xmission.com> wrote:
>
> A quick skim shows that these threads are not showing up anywhere in
> proc which appears to be a problem, as it hides them from top.
>
> Sysadmins need the ability to dig into a system and find out where all
> their cpu usage or io's have gone when there is a problem.  I general I
> think this argues that these threads should show up as threads of the
> process so I am not even certain this is the right fix to deal with gdb.

Yeah, I do think that hiding them is the wrong model, because it also
hides them from "ps" etc, which is very wrong.

I don't know what the gdb logic is, but maybe there's some other
option that makes gdb not react to them?

          Linus

  reply	other threads:[~2021-03-25 19:40 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-25 16:43 [PATCH 0/2] Don't show PF_IO_WORKER in /proc/<pid>/task/ Jens Axboe
2021-03-25 16:43 ` [PATCH 1/2] kernel: don't include PF_IO_WORKERs as part of same_thread_group() Jens Axboe
2021-03-25 16:43 ` [PATCH 2/2] proc: don't show PF_IO_WORKER threads as threads in /proc/<pid>/task/ Jens Axboe
2021-03-29  1:57   ` [proc] 43b2a76b1a: will-it-scale.per_process_ops -11.3% regression kernel test robot
2021-03-29  1:57     ` kernel test robot
2021-03-25 19:33 ` [PATCH 0/2] Don't show PF_IO_WORKER in /proc/<pid>/task/ Eric W. Biederman
2021-03-25 19:38   ` Linus Torvalds [this message]
2021-03-25 19:40     ` Jens Axboe
2021-03-25 19:42     ` Linus Torvalds
2021-03-25 19:46       ` Jens Axboe
2021-03-25 20:21         ` Eric W. Biederman
2021-03-25 20:40           ` Oleg Nesterov
2021-03-25 20:43             ` Jens Axboe
2021-03-25 20:48             ` Eric W. Biederman
2021-03-25 20:42           ` Jens Axboe
2021-03-25 20:12       ` Linus Torvalds
2021-03-25 20:40         ` Jens Axboe
2021-03-25 21:44           ` Jens Axboe
2021-03-25 21:57             ` Stefan Metzmacher
2021-03-26  0:11               ` Jens Axboe
2021-03-26 11:59                 ` Stefan Metzmacher
2021-04-01 14:40                   ` Stefan Metzmacher
2021-03-25 22:37             ` Linus Torvalds
2021-03-26  0:08               ` Jens Axboe
2021-03-25 20:43         ` Eric W. Biederman
2021-03-25 21:50           ` Jens Axboe
2021-03-25 20:44         ` Oleg Nesterov
2021-03-25 20:55           ` Eric W. Biederman
2021-03-25 21:20             ` Stefan Metzmacher
2021-03-25 21:48               ` Stefan Metzmacher
2021-03-25 19:40   ` Jens Axboe
2021-03-25 20:32     ` Oleg Nesterov

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