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From: Jens Axboe <axboe@kernel.dk>
To: Miroslav Benes <mbenes@suse.cz>, Oleg Nesterov <oleg@redhat.com>
Cc: linux-kernel@vger.kernel.org, io-uring@vger.kernel.org,
	peterz@infradead.org, tglx@linutronix.de,
	live-patching@vger.kernel.org
Subject: Re: [PATCHSET RFC v3 0/6] Add support for TIF_NOTIFY_SIGNAL
Date: Fri, 9 Oct 2020 09:21:25 -0600	[thread overview]
Message-ID: <e33ec671-3143-d720-176b-a8815996fd1c@kernel.dk> (raw)
In-Reply-To: <alpine.LSU.2.21.2010090959260.23400@pobox.suse.cz>

On 10/9/20 2:01 AM, Miroslav Benes wrote:
> On Thu, 8 Oct 2020, Oleg Nesterov wrote:
> 
>> On 10/05, Jens Axboe wrote:
>>>
>>> Hi,
>>>
>>> The goal is this patch series is to decouple TWA_SIGNAL based task_work
>>> from real signals and signal delivery.
>>
>> I think TIF_NOTIFY_SIGNAL can have more users. Say, we can move
>> try_to_freeze() from get_signal() to tracehook_notify_signal(), kill
>> fake_signal_wake_up(), and remove freezing() from recalc_sigpending().
>>
>> Probably the same for TIF_PATCH_PENDING, klp_send_signals() can use
>> set_notify_signal() rather than signal_wake_up().
> 
> Yes, that was my impression from the patch set too, when I accidentally 
> noticed it.
> 
> Jens, could you CC our live patching ML when you submit v4, please? It 
> would be a nice cleanup.

Definitely, though it'd be v5 at this point. But we really need to get
all archs supporting TIF_NOTIFY_SIGNAL first. Once we have that, there's
a whole slew of cleanups that'll fall out naturally:

- Removal of JOBCTL_TASK_WORK
- Removal of special path for TWA_SIGNAL in task_work
- TIF_PATCH_PENDING can be converted and then removed
- try_to_freeze() cleanup that Oleg mentioned

And probably more I'm not thinking of right now :-)

-- 
Jens Axboe


  reply	other threads:[~2020-10-09 15:21 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-05 15:04 [PATCHSET RFC v3 0/6] Add support for TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-05 15:04 ` [PATCH 1/6] tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume() Jens Axboe
2020-10-08 12:37   ` Oleg Nesterov
2020-10-08 13:36     ` Jens Axboe
2020-10-05 15:04 ` [PATCH 2/6] kernel: add task_sigpending() helper Jens Axboe
2020-10-08 12:58   ` Oleg Nesterov
2020-10-08 13:36     ` Jens Axboe
2020-10-08 13:24   ` Oleg Nesterov
2020-10-08 13:38     ` Jens Axboe
2020-10-05 15:04 ` [PATCH 3/6] kernel: split syscall restart from signal handling Jens Axboe
2020-10-08 14:21   ` Oleg Nesterov
2020-10-08 14:31     ` Jens Axboe
2020-10-08 14:41       ` Jens Axboe
2020-10-08 14:45       ` Oleg Nesterov
2020-10-08 14:47         ` Jens Axboe
2020-10-05 15:04 ` [PATCH 4/6] kernel: add support for TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-08 13:53   ` Oleg Nesterov
2020-10-08 14:07     ` Jens Axboe
2020-10-08 14:27       ` Oleg Nesterov
2020-10-05 15:04 ` [PATCH 5/6] x86: define _TIF_NOTIFY_SIGNAL Jens Axboe
2020-10-05 15:04 ` [PATCH 6/6] task_work: use TIF_NOTIFY_SIGNAL if available Jens Axboe
2020-10-08 14:56 ` [PATCHSET RFC v3 0/6] Add support for TIF_NOTIFY_SIGNAL Oleg Nesterov
2020-10-08 15:00   ` Jens Axboe
2020-10-09  8:01   ` Miroslav Benes
2020-10-09 15:21     ` Jens Axboe [this message]
2020-10-10 16:53       ` Jens Axboe
2020-10-12 17:27         ` Miroslav Benes
2020-10-13 19:39           ` Jens Axboe
2020-10-13 23:34             ` Thomas Gleixner
2020-10-13 23:37               ` Jens Axboe

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