linux-kernel - Re: [PATCH RFC] blk-mq: Don't IPI requests on PREEMPT

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Message-ID: <20201028100420.GY2628@hirez.programming.kicks-ass.net>
Date:   Wed, 28 Oct 2020 11:04:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        David Runge <dave@...epmap.de>, linux-rt-users@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Wagner <dwagner@...e.de>
Subject: Re: [PATCH RFC] blk-mq: Don't IPI requests on PREEMPT_RT

On Tue, Oct 27, 2020 at 05:23:09PM +0000, Christoph Hellwig wrote:
> Ok.  I was hoping we could hide this in core code somehow, especially
> a peterz didn't like the use of smp_call_function_single_async in the
> blk-mq completion code very much.

It's smp_call_function_single_async() in general that I don't much like.
But Linus seemed unconvinced, so we'll keep it for a while I suppose.