Re: [PATCH 2/2] io_uring: use TWA_SIGNAL for task_work if the task isn't running

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Subject: Re: [PATCH 2/2] io_uring: use TWA_SIGNAL for task_work if the task isn't running
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Mon, 10 Aug 2020 23:10:57 +0200
Cc: Jann Horn <jannh@xxxxxxxxxx>, io-uring <io-uring@xxxxxxxxxxxxxxx>, stable <stable@xxxxxxxxxxxxxxx>, Josef <josef.grieb@xxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>
In-reply-to: <03c0e282-5317-ea45-8760-2c3f56eec0c0@kernel.dk>
User-agent: Mutt/1.10.1 (2018-07-13)

On Mon, Aug 10, 2020 at 03:06:49PM -0600, Jens Axboe wrote:

> should work as far as I can tell, but I don't even know if there's a
> reliable way to do task_in_kernel().

Only on NOHZ_FULL, and tracking that is one of the things that makes it
so horribly expensive.

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