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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 B8EA8C34026 for ; Tue, 18 Feb 2020 13:13:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86C24206F4 for ; Tue, 18 Feb 2020 13:13:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="VsbOCeem" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726442AbgBRNN4 (ORCPT ); Tue, 18 Feb 2020 08:13:56 -0500 Received: from merlin.infradead.org ([205.233.59.134]:49182 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726086AbgBRNN4 (ORCPT ); Tue, 18 Feb 2020 08:13:56 -0500 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=EL9Z1hymITAdsVTeF0C6/J/IZONkKNCLrMb8u+SP1ec=; b=VsbOCeem0C6QjceKbVafDym55O 3LQUT6fcFUX446PpAJn+p+AlahocJyxnMIMyWtPghQWIuOU9qjweL4Hr2VBzWxEa3QeyFsJRqmthb khlfclkR0lsjsz+uw529V0fx3oUBRsPYr/SxXj9l7r0S7JwUgpdGIJiOU/Wx34Hy/5+/vgyPsMbpk qyvC0hkcWjuuEQpCvEljSphaIW6qY4xYKK6sCF0UG9aR0pEDg6bVzxT3zr5eKdDSFg9FaLSoUu2K9 iQmkxPS/fk1GXqRp+XytGTWhWmoONfY22V/AysoNP+ymD3v2v62LT25mOLLJf+/fmJgZYK0TLLSFC HG+W/koQ==; 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 1j42hA-0004V5-VM; Tue, 18 Feb 2020 13:13:49 +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 A96B5300565; Tue, 18 Feb 2020 14:11:54 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 5F8712B92E8B7; Tue, 18 Feb 2020 14:13:46 +0100 (CET) Date: Tue, 18 Feb 2020 14:13:46 +0100 From: Peter Zijlstra To: Jens Axboe Cc: Carter Li =?utf-8?B?5p2O6YCa5rSy?= , Pavel Begunkov , io-uring Subject: Re: [ISSUE] The time cost of IOSQE_IO_LINK Message-ID: <20200218131346.GA14914@hirez.programming.kicks-ass.net> References: <671A3FE3-FA12-43D8-ADF0-D1DB463B053F@eoitek.com> <217eda7b-3742-a50b-7d6a-c1294a85c8e0@kernel.dk> <1b9a7390-7539-a8bc-d437-493253b13d77@kernel.dk> <20200214153218.GM14914@hirez.programming.kicks-ass.net> <5995f84e-8a6c-e774-6bb5-5b9b87a9cd3c@kernel.dk> <7c4c3996-4886-eb58-cdee-fe0951907ab5@kernel.dk> <20200217120920.GQ14914@hirez.programming.kicks-ass.net> <53de3581-b902-89ba-3f53-fd46b052df40@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <53de3581-b902-89ba-3f53-fd46b052df40@kernel.dk> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Mon, Feb 17, 2020 at 08:12:30AM -0800, Jens Axboe wrote: > Only potential hitch I see there is related to ordering, which is more > of a fairness thab correctness issue. I'm going to ignore that for now, > and we can always revisit later. If that ever becomes a thing, see: c82199061009 ("task_work: remove fifo ordering guarantee")