From: Pavel Begunkov <[email protected]>
To: Tejun Heo <[email protected]>
Cc: Oleg Nesterov <[email protected]>,
[email protected], Jens Axboe <[email protected]>,
Andrew Morton <[email protected]>,
Christian Brauner <[email protected]>,
Tycho Andersen <[email protected]>,
Thomas Gleixner <[email protected]>,
[email protected], Julian Orth <[email protected]>,
Peter Zijlstra <[email protected]>
Subject: Re: [PATCH 2/2] kernel: rerun task_work while freezing in get_signal()
Date: Wed, 10 Jul 2024 18:53:03 +0100 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 7/10/24 01:54, Tejun Heo wrote:
> Hello,
>
> On Tue, Jul 09, 2024 at 08:55:43PM +0100, Pavel Begunkov wrote:
> ...
>>>> CRIU, I assume. I'll try it ...
>>>
>>> Than I think we can forget about task_works and this patch. CRIU dumps
>>> the tasks in TASK_TRACED state.
>>
>> And would be hard to test, io_uring (the main source of task_work)
>> is not supported
>>
>> (00.466022) Error (criu/proc_parse.c:477): Unknown shit 600 (anon_inode:[io_uring])
>> ...
>> (00.467642) Unfreezing tasks into 1
>> (00.467656) Unseizing 15488 into 1
>> (00.468149) Error (criu/cr-dump.c:2111): Dumping FAILED.
>
> Yeah, the question is: If CRIU is to use cgroup freezer to freeze the tasks
> and then go around tracing each to make dump, would the freezer be enough in
> avoiding interim state changes? Using CRIU implementation is a bit arbitrary
> but I think checkpoint-restart is a useful bar to measure what should stay
> stable while a cgroup is frozen.
Sounds like in the long run we might want to ignore task_work while
it's frozen, but hard to say for all task_work users.
--
Pavel Begunkov
next prev parent reply other threads:[~2024-07-10 17:53 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-07 16:32 [PATCH 0/2] fix task_work interation with freezing Pavel Begunkov
2024-07-07 16:32 ` [PATCH 1/2] io_uring/io-wq: limit retrying worker initialisation Pavel Begunkov
2024-07-07 16:32 ` [PATCH 2/2] kernel: rerun task_work while freezing in get_signal() Pavel Begunkov
2024-07-08 10:42 ` Oleg Nesterov
2024-07-08 15:40 ` Pavel Begunkov
2024-07-08 18:48 ` Peter Zijlstra
2024-07-09 10:36 ` Oleg Nesterov
2024-07-09 14:05 ` Pavel Begunkov
2024-07-09 16:39 ` Tejun Heo
2024-07-09 19:07 ` Oleg Nesterov
2024-07-09 19:26 ` Pavel Begunkov
2024-07-09 19:38 ` Oleg Nesterov
2024-07-09 19:55 ` Pavel Begunkov
2024-07-10 0:54 ` Tejun Heo
2024-07-10 17:53 ` Pavel Begunkov [this message]
2024-07-10 19:10 ` Oleg Nesterov
2024-07-10 19:20 ` Tejun Heo
2024-07-10 21:34 ` Oleg Nesterov
2024-07-10 22:01 ` Tejun Heo
2024-07-10 22:17 ` Oleg Nesterov
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