From: ebiederm@xmission.com (Eric W. Biederman)
To: Jens Axboe <axboe@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
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 15:21:30 -0500 [thread overview]
Message-ID: <m1zgyr2ddh.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <3a1c02a5-db6d-e3e1-6ff5-69dd7cd61258@kernel.dk> (Jens Axboe's message of "Thu, 25 Mar 2021 13:46:46 -0600")
Jens Axboe <axboe@kernel.dk> writes:
> On 3/25/21 1:42 PM, Linus Torvalds wrote:
>> On Thu, Mar 25, 2021 at 12:38 PM Linus Torvalds
>> <torvalds@linux-foundation.org> wrote:
>>>
>>> I don't know what the gdb logic is, but maybe there's some other
>>> option that makes gdb not react to them?
>>
>> .. maybe we could have a different name for them under the task/
>> subdirectory, for example (not just the pid)? Although that probably
>> messes up 'ps' too..
>
> Heh, I can try, but my guess is that it would mess up _something_, if
> not ps/top.
Hmm.
So looking quickly the flip side of the coin is gdb (and other
debuggers) needs a way to know these threads are special, so it can know
not to attach.
I suspect getting -EPERM (or possibly a different error code) when
attempting attach is the right was to know that a thread is not
available to be debugged.
Eric
next prev parent reply other threads:[~2021-03-25 20:23 UTC|newest]
Thread overview: 31+ 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
2021-03-25 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
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 [this message]
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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