From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 492DAC4363A for ; Thu, 29 Oct 2020 02:02:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA7C320720 for ; Thu, 29 Oct 2020 02:02:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CgD2LZ1Y" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727318AbgJ1Vsw (ORCPT ); Wed, 28 Oct 2020 17:48:52 -0400 Received: from merlin.infradead.org ([205.233.59.134]:57330 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725862AbgJ1VnN (ORCPT ); Wed, 28 Oct 2020 17:43:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=tjSu2r9Bd9biMwop8Y+5xZtR8qA8hCA/zD7QW3Q6gMw=; b=CgD2LZ1Y5veuIIAid305ik/pa9 YXiupXv3xMxxpXUTfAwvU+hMTAVV2/HgYkdQbRyLz9K5Nem7UQbJmwNvO3LZbqNWk+RenntYKH0ln G2f2QmL58EDN678aOzhm51beGQZBXKhme+/jAIaUz2dKbeWdkbo2zMG91Uj09Z2BpZok6/ZcJTbnG rqKR4oINLS8FplmKtv/6T0j+feA87E24fqyA1taK+unANSq1wiRvkRDnQ2vrPQ6ANp1dBHptlJg0N Rj67qcm6NlEFuRJZ53tI9Wzpbr8pEoYbfOtLG2FkiJ8iX89BFgWBGR2+qVyd6z6GF+04LBUDLZuNr q3JRKBnQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kXiJa-0003mv-N5; Wed, 28 Oct 2020 10:04:22 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id DCEF9300455; Wed, 28 Oct 2020 11:04:20 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id C57CC20B28590; Wed, 28 Oct 2020 11:04:20 +0100 (CET) Date: Wed, 28 Oct 2020 11:04:20 +0100 From: Peter Zijlstra To: Christoph Hellwig Cc: Thomas Gleixner , Sebastian Andrzej Siewior , David Runge , linux-rt-users@vger.kernel.org, Jens Axboe , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Wagner Subject: Re: [PATCH RFC] blk-mq: Don't IPI requests on PREEMPT_RT Message-ID: <20201028100420.GY2628@hirez.programming.kicks-ass.net> References: <20201021175059.GA4989@hmbx> <20201023110400.bx3uzsb7xy5jtsea@linutronix.de> <20201023112130.GA23790@infradead.org> <20201023135219.mzzl76eqqy6tqwhe@linutronix.de> <20201027092606.GA20805@infradead.org> <20201027101102.cvczdb3mkvtoguo5@linutronix.de> <20201027160742.GA19073@infradead.org> <87eelj1tx0.fsf@nanos.tec.linutronix.de> <20201027172309.GA15004@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201027172309.GA15004@infradead.org> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org 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.