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Subject: Re: [PATCH v2 0/4][RESEND] cancel all reqs of an exiting task
To:     Pavel Begunkov <asml.silence@gmail.com>, io-uring@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <cover.1592205754.git.asml.silence@gmail.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <8033114e-069d-e8d0-f476-1f4d4bed3e25@kernel.dk>
Date:   Mon, 15 Jun 2020 09:04:15 -0600
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On 6/15/20 1:24 AM, Pavel Begunkov wrote:
> io_uring_flush() {
>         ...
>         if (fatal_signal_pending(current) || (current->flags & PF_EXITING))
>                 io_wq_cancel_pid(ctx->io_wq, task_pid_vnr(current));
> }
> 
> This cancels only the first matched request. The pathset is mainly
> about fixing that. [1,2] are preps, [3/4] is the fix.
> 
> The [4/4] tries to improve the worst case for io_uring_cancel_files(),
> that's when they are a lot of inflights with ->files. Instead of doing
> {kill(); wait();} one by one, it cancels all of them at once.

Applied, thanks.

-- 
Jens Axboe