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 1AD31C2D0C0 for ; Sat, 21 Dec 2019 16:15:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB37C2070C for ; Sat, 21 Dec 2019 16:15:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="f1TlKUQM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726567AbfLUQPy (ORCPT ); Sat, 21 Dec 2019 11:15:54 -0500 Received: from mail-wr1-f46.google.com ([209.85.221.46]:46672 "EHLO mail-wr1-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726107AbfLUQPy (ORCPT ); Sat, 21 Dec 2019 11:15:54 -0500 Received: by mail-wr1-f46.google.com with SMTP id z7so12252714wrl.13; Sat, 21 Dec 2019 08:15:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=uWWA9BCgE+K2NQkuc50Eq4PxEQrT4ZogDuJJDySx0KY=; b=f1TlKUQM6/lUk71PGrO+nInax2XNJG50oWofeMLynCRSJtolr40efsW4LsA4zIf8/1 xC+MkTgEdJmrF9aQFnGYJwQv1zndoxVsIM0gS/6X2UmTyhknmLAJ2L7bnzlqD2dJayab EpaX+rGsxFvN2nKm8X4RdOB4MlsQV8Y0cWDaF5BqtpRRWFnGIiNpIF6I1WY/S8a7uSEt xMNuqHS7fXA2DJj4Hxx0zvVaw3iFgqgx8s4EbTZrZ/pajNtF+Ye4QcexOJqJCEkQGtwq FnX2HI8l0t7CbMnj1XUIRwYOEI9CtElOzDibRn5eyVDwXt26f83o2bA1ufrvyh8QvEQK +Zrw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uWWA9BCgE+K2NQkuc50Eq4PxEQrT4ZogDuJJDySx0KY=; b=VAPuJ1kKj3fVKh9IZb9IyT877FMU5fBke6BMQsR54hmLMQ2nOWhxOzZIcUKLywrMbS s7DGrwqkpbYkq1iSMjT0z8fPOrqPfYPwaVM4gGjHziKRSQPARajajj2bCl8RcyHU6YpC IOto3WcE0G7bp4Bua6lHXFU7s8sKNkbh1a/AmOcVZ6GXo36fYY1xe17vddIvhNYsegYO dcBEL3rIvuaPXHYgErgAHJCpMEGNAcJ0kdJ3aVID3REWOJomgqmwALZfqH5QPg6u8MKE Jv0X6WR7dBCGNmFio5nSuYJkd6en/c0Mnl5N1whbQ4tTKIb5hHAa1Wmr2yGP0pUgqo7k OboA== X-Gm-Message-State: APjAAAVyvzwUzktBpy8befMvCCl8/vAW4QzpvoLpWplavlUONPHQ4pZl 3gkL7QyACVMCWfpKYg+kGQU= X-Google-Smtp-Source: APXvYqyQkbqywsZ/+pSN3Q+6oQRcIzDb0Kfc/qx+tfWh/MW6nbyZsBc9IjeoRvifDcKJx9NpHLzHmQ== X-Received: by 2002:adf:f1c6:: with SMTP id z6mr22480303wro.279.1576944951783; Sat, 21 Dec 2019 08:15:51 -0800 (PST) Received: from localhost.localdomain ([109.126.149.134]) by smtp.gmail.com with ESMTPSA id o129sm13831260wmb.1.2019.12.21.08.15.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Dec 2019 08:15:51 -0800 (PST) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Tejun Heo , Dennis Zhou , Christoph Lameter Subject: [PATCH v2 0/3] optimise ctx's refs grabbing in io_uring Date: Sat, 21 Dec 2019 19:15:06 +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 Pavel Begunkov (3): pcpu_ref: add percpu_ref_tryget_many() io_uring: batch getting pcpu references io_uring: batch get(ctx->ref) across submits fs/io_uring.c | 29 ++++++++++++++++++++++++++--- include/linux/percpu-refcount.h | 26 +++++++++++++++++++++----- 2 files changed, 47 insertions(+), 8 deletions(-) -- 2.24.0