linux-kernel - Re: [PATCH] livepatch: klp_send_signal should treat PF_IO_WORKER like PF

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Message-ID: <832b5870-b926-3ccb-155d-3c364ee5508d@kernel.dk>
Date:   Thu, 25 Mar 2021 10:29:44 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Dong Kai <dongkai11@...wei.com>, jpoimboe@...hat.com,
        jikos@...nel.org, mbenes@...e.cz, pmladek@...e.com,
        joe.lawrence@...hat.com
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] livepatch: klp_send_signal should treat PF_IO_WORKER like
 PF_KTHREAD

On 3/24/21 7:48 PM, Dong Kai wrote:
> commit 15b2219facad ("kernel: freezer should treat PF_IO_WORKER like
> PF_KTHREAD for freezing") is to fix the freezeing issue of IO threads
> by making the freezer not send them fake signals.
> 
> Here live patching consistency model call klp_send_signals to wake up
> all tasks by send fake signal to all non-kthread which only check the
> PF_KTHREAD flag, so it still send signal to io threads which may lead to
> freezeing issue of io threads.
> 
> Here we take the same fix action by treating PF_IO_WORKERS as PF_KTHREAD
> within klp_send_signal function.

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe