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=-3.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 6D0B7C2D0C6 for ; Sat, 28 Dec 2019 11:13:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3B37920748 for ; Sat, 28 Dec 2019 11:13:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZeVIBTUe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726220AbfL1LNk (ORCPT ); Sat, 28 Dec 2019 06:13:40 -0500 Received: from mail-wm1-f41.google.com ([209.85.128.41]:40616 "EHLO mail-wm1-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726100AbfL1LNk (ORCPT ); Sat, 28 Dec 2019 06:13:40 -0500 Received: by mail-wm1-f41.google.com with SMTP id t14so10273166wmi.5; Sat, 28 Dec 2019 03:13:39 -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=KElmZM5dkNAHQpTzzrjHnML4RPBEKGzTVPP1i0RJr8E=; b=ZeVIBTUeg+eAWruRVTTD2sDc52dRhuO1XtufRbTQ6WWy3kCgKjw+SSwflPcflZ/IzK j4Z5XNY0kaU43IoTsXvWJXDd65wQMAJiqQwtyjMAeGrEdLkwhHok45Ce3Kx7nFkJV4us xmrssh1k7RteUSB2MAXLhUn9UW/MwAPumOPG6fX1Cj874GB2V/cua6XwYiFZdcsiBBeE knB0ejaTWScka1/aciLT+4YCa5j2h7QjHRDfeCxEb+sUTDgRE5BX/lh68J2a79sBckFb 0o2jJHC8zR2xtC+luLHOXz5UW6Q55s2ct0u4+Sq3XprSRDEtG02/F97zWlTK4pzgETZg Qg8A== 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=KElmZM5dkNAHQpTzzrjHnML4RPBEKGzTVPP1i0RJr8E=; b=co2Ygu9080BoyNtF/gzCIPA9ximJa5vtPmwx5PPYrIdNTGTmf9+zqQxgyZnpb7qxqG tsSfwZr3e4neZ5bwCfrTUqKW11mbPpp11U/KHJ8cmyj1v0B8ntXZCelRxSWL7AY3Dgm2 K/liNeTtCx0WnmW1j42+B7KSpUMf1d9c28V7O1tPCeOx2J1qimo7IfTM5J+eb/HLeQmm XL/b2dHWA4KtaD6lm/6oKXpMdfY7wQ3ka/aOXxhVfozTArxIIjWdcZCRWYO/hh5MI8rc TTfwt9/PJnnUi5W6hBont2INyEl1kaNFyRtivLDDAcJ8dEoXxtltuinpH3EbNqGz10aZ ycPg== X-Gm-Message-State: APjAAAUALNUVVTAnfYP+fTYDtTdyd4ZLV+0caLYg6N617VSJa/fz3tE9 guA+Wo8sANHIi3JRq0uXIl9zRRkI X-Google-Smtp-Source: APXvYqwHDiWz56gLSReUATaFd7iR5Bga0tyJTpWEZW5vJa7oiLijQN3a2ZO8bnlvqdfjw0QIpQxDsA== X-Received: by 2002:a1c:f009:: with SMTP id a9mr23143964wmb.73.1577531618221; Sat, 28 Dec 2019 03:13:38 -0800 (PST) Received: from localhost.localdomain ([109.126.145.157]) by smtp.gmail.com with ESMTPSA id q11sm37432622wrp.24.2019.12.28.03.13.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Dec 2019 03:13:37 -0800 (PST) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/2] optimise ctx's refs grabbing in io_uring Date: Sat, 28 Dec 2019 14:13:01 +0300 Message-Id: X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Optimise percpu_ref_tryget() by not calling it for each request, but batching it. This gave a measurable ~5% performance boost for large QD. v2: fix uncommited plug (Jens Axboe) better comments for percpu_ref_tryget_many (Dennis Zhou) amortise across io_uring_enter() boundary v3: drop "batching across syscalls" remove error handling in io_submit_sqes() from common path v4: fix error handling Pavel Begunkov (2): pcpu_ref: add percpu_ref_tryget_many() io_uring: batch getting pcpu references fs/io_uring.c | 26 +++++++++++++++++--------- include/linux/percpu-refcount.h | 26 +++++++++++++++++++++----- 2 files changed, 38 insertions(+), 14 deletions(-) -- 2.24.0