From patchwork Tue Nov 5 21:22:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 11228739 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AC6E0112B for ; Tue, 5 Nov 2019 21:22:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9374621D71 for ; Tue, 5 Nov 2019 21:22:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="lORbx4kk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730037AbfKEVWl (ORCPT ); Tue, 5 Nov 2019 16:22:41 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:38699 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729952AbfKEVWi (ORCPT ); Tue, 5 Nov 2019 16:22:38 -0500 Received: by mail-wr1-f68.google.com with SMTP id j15so2545755wrw.5; Tue, 05 Nov 2019 13:22:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=yE/g1StzjTRv1LozWXzXyJOSSN2k4w9cmTMk4QzLLag=; b=lORbx4kkK1jCf4mnCvop3UcrcNHVsMQcK+FsIRZP5yTK+EOCXD5jQcY1yXYTubIvb1 c1Q1m9DOcR92tOP1cafcFc2IbdFnv6tggNzLiKMSah784RcSTMS8GmTlVj2r+8bS8rbJ z4+ZhyqC8yM6pGgzPPp0+P+6Jhpn3gL4DuuhhCekKHyUhrvVjIMHcSNG/r7Ih2TWUTiV S9s4wBGMGh7tjU6ZQLdy8jMsEW+KeEsrNkNj1d/ocGS0wtebBqdYyRl+SejdjTazVL7L tGD256nUiP4cFNGa/paa6uetedfPvKg0jx13ex6kM8hg8JjHGDiX7R4H9Z+b59doACXP NKkg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yE/g1StzjTRv1LozWXzXyJOSSN2k4w9cmTMk4QzLLag=; b=IYiELGtyS66hzSpLDiiRkbhORkcSXoCkGlYXuF5YJ5eqQwOEIZpwKwWwiQDJ4dBcTb 9+tDWsO65/ELoRBYqCcHZOXTfamuEcjleJa6SaZ6nta2Tswlnu3PLijaj/3k98XF4Is3 2rP5l+xpdCgeo2HNOllYQQNjhUJcIUvq4L6yUCSh/KFfTkLRwutN3C2jka90i2hF/mSa UusOmELaRuAhr3e2ae9MOKQzmOVpNA1J9yQm211goTrKaDNeE1nQFxpBPTt1U/yIEEK5 1hzFd2tgXgCUJbcVTgy+VMQoBG1Lss1Nxqfn+fDGaA7M/v1dfpb7DXNAYUi+qiIuN3Il iD2g== X-Gm-Message-State: APjAAAXjSedXrHi4YYP64Mbx2eG8fMPaBfvxPDCrS6yWzIURNx/wtMf1 SP5UzbI36JOu1CvyX0sOMeEqEzUj X-Google-Smtp-Source: APXvYqz1aG3/HGqjz870SN9nJ0JRTp1mW/t2dzo1n8LsUrZ+hUk7eKBm1rToU8eSArtOfnD6B/SaEw== X-Received: by 2002:adf:dc06:: with SMTP id t6mr12794415wri.378.1572988956444; Tue, 05 Nov 2019 13:22:36 -0800 (PST) Received: from localhost.localdomain ([109.126.129.81]) by smtp.gmail.com with ESMTPSA id 16sm1061197wmf.0.2019.11.05.13.22.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Nov 2019 13:22:36 -0800 (PST) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] io_uring: io_queue_link*() right after submit Date: Wed, 6 Nov 2019 00:22:15 +0300 Message-Id: <85a316b577e1b5204d27a96a7ce452ed6be3c2ae.1572988512.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org After a call to io_submit_sqe(), it's already known whether it needs to queue a link or not. Do it there, as it's simplier and doesn't keep an extra variable across the loop. Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index ebe2a4edd644..82c2da99cb5c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2687,7 +2687,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, struct io_submit_state state, *statep = NULL; struct io_kiocb *link = NULL; struct io_kiocb *shadow_req = NULL; - bool prev_was_link = false; int i, submitted = 0; bool mm_fault = false; @@ -2710,17 +2709,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, } } - /* - * If previous wasn't linked and we have a linked command, - * that's the end of the chain. Submit the previous link. - */ - if (!prev_was_link && link) { - io_queue_link_head(ctx, link, &link->submit, shadow_req); - link = NULL; - shadow_req = NULL; - } - prev_was_link = (s.sqe->flags & IOSQE_IO_LINK) != 0; - if (link && (s.sqe->flags & IOSQE_IO_DRAIN)) { if (!shadow_req) { shadow_req = io_get_req(ctx, NULL); @@ -2741,6 +2729,16 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr, trace_io_uring_submit_sqe(ctx, s.sqe->user_data, true, async); io_submit_sqe(ctx, &s, statep, &link); submitted++; + + /* + * If previous wasn't linked and we have a linked command, + * that's the end of the chain. Submit the previous link. + */ + if (!(s.sqe->flags & IOSQE_IO_LINK) && link) { + io_queue_link_head(ctx, link, &link->submit, shadow_req); + link = NULL; + shadow_req = NULL; + } } if (link)