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 87A2CC2D0D3 for ; Sat, 21 Dec 2019 20:13:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5B0F820665 for ; Sat, 21 Dec 2019 20:13:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ITBJT26H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727355AbfLUUN2 (ORCPT ); Sat, 21 Dec 2019 15:13:28 -0500 Received: from mail-wr1-f47.google.com ([209.85.221.47]:44706 "EHLO mail-wr1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726593AbfLUUN2 (ORCPT ); Sat, 21 Dec 2019 15:13:28 -0500 Received: by mail-wr1-f47.google.com with SMTP id q10so12656013wrm.11; Sat, 21 Dec 2019 12:13:26 -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=YewY49XOAwtgbRRM+dP5nVDRUmX/pUzxJlp1fUg5boo=; b=ITBJT26HYgtPwbf6168Te/atLxFRAtSdNpkeflQI7gSTCyeH//PG6bJGBkCr45W43y 7ZmWCcR0MaLpOCcjIrxCwnKEPhonlLaYsuJCXS0WHtSOABKzmNEAtl+X5P220Oex2aAA TQBICDi39CxAODjMzMQbpbg3L0ds3OAELwrCqFDv34JRwMvaDBkgcgyEPkXMkidk9qDt 4W8XQQNb9lCR+FFutyz+M67p+7/MEjHIOPf073M+trlgseC1ukA6ze6zAUlJ54YExinH pzSBrfUJPSPnRVv7pYEeCbIT8mludl08xwbQEticqDpd5iDUiKT14gv6sSZySCAdagYD 0/Lg== 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=YewY49XOAwtgbRRM+dP5nVDRUmX/pUzxJlp1fUg5boo=; b=MKJlLVFe0bu8ejjOyHhFwjPyraMVtQi1HSKNApoSQyBK6DnSVR7oMGg3nBCz9JLrYe to5qz2u+KkQwQf5Ar8eQ845zuwRmvz+AOwYKeJhuzyc/YESqYn0EQFWhKr2e4ZwrZ0HM HviMz/XzKHqpSh5lgDVxh/zl+TGzv4acchXdIz+9EKRuoSQ3uCbv3rDL5AdMRRMxCP/f MUMNBm9j++S7Zp0o9l9IEr7IuScCTH2I0gUyWFytcKX55Ia1zM96FJ16h6K06/lbsOyy ycY9So1XFbEU2EYf3yZHSV8+O+qvEigFgz7zHu/iUIfglLEmjml8JbOc0snteoWlgC5l L7JQ== X-Gm-Message-State: APjAAAXjYjUZnfxwOCBHw6ghzGU6l62eenL/18WT1L2UsMp8qXw4vdCz Q0Mj2xJsq7lkb/HIqlz08Oc= X-Google-Smtp-Source: APXvYqygGQW5SsTgWaiIi8noPMj5B8mAf3B2ZBWSegMJalCplWoLys/Gux5P+gVTlMf6TY6GgoNW6w== X-Received: by 2002:a5d:4b47:: with SMTP id w7mr22981832wrs.276.1576959205632; Sat, 21 Dec 2019 12:13:25 -0800 (PST) Received: from localhost.localdomain ([109.126.149.134]) by smtp.gmail.com with ESMTPSA id l7sm14470821wrq.61.2019.12.21.12.13.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Dec 2019 12:13:25 -0800 (PST) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/2] optimise ctx's refs grabbing in io_uring Date: Sat, 21 Dec 2019 23:12:52 +0300 Message-Id: X-Mailer: git-send-email 2.24.0 In-Reply-To: <925d8fe5406779bbfa108caa3d1f9fd16e3434b5.1576944502.git.asml.silence@gmail.com> References: <925d8fe5406779bbfa108caa3d1f9fd16e3434b5.1576944502.git.asml.silence@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 Pavel Begunkov (2): pcpu_ref: add percpu_ref_tryget_many() io_uring: batch getting pcpu references fs/io_uring.c | 14 ++++++++++---- include/linux/percpu-refcount.h | 26 +++++++++++++++++++++----- 2 files changed, 31 insertions(+), 9 deletions(-) -- 2.24.0