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=-10.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 CB30FC433ED for ; Tue, 13 Apr 2021 07:37:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B07AF61370 for ; Tue, 13 Apr 2021 07:37:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241148AbhDMHh1 (ORCPT ); Tue, 13 Apr 2021 03:37:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240979AbhDMHhW (ORCPT ); Tue, 13 Apr 2021 03:37:22 -0400 Received: from mail-pf1-x432.google.com (mail-pf1-x432.google.com [IPv6:2607:f8b0:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 66EDFC061574 for ; Tue, 13 Apr 2021 00:37:03 -0700 (PDT) Received: by mail-pf1-x432.google.com with SMTP id n38so10897256pfv.2 for ; Tue, 13 Apr 2021 00:37:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=1wj/P641sD/e5hD8zFgOUD41DvnEOt3Hc9lA4lyfQJw=; b=NK3frzvdW3ud3kjLPx4OsxwMpdZ1NjA1NtsDL9Y1kDzUCyA32byROcomS1jI6UhsLO jumgwA75Emo0ROYheWpVPfZ/C5rYerF2GHo2NonsePo8L3sC2HoiiZLL/gkJ7K+A5zaN U0VnIbLj2yAV4Bf4g4JnEIgugsP7kjexCtZ6m2KptQAtYP+AvEKPDslfDpsNme6TNDRx 7TNmPbOSunzhVPYTuoYw17dO0F16ilR/XgW0QyHqofKiPgoQ4dLzdVrcEpoROrSKSARS J/VKSZWS92NKEb12CvcWuVYTy4CAK5T6v8HFJjemsJRuLvKOA9zkPkn104cvDjOSTiAd 9c1Q== 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:mime-version :content-transfer-encoding; bh=1wj/P641sD/e5hD8zFgOUD41DvnEOt3Hc9lA4lyfQJw=; b=m1URs5RmZDl3K+bjN5mtMnJMWvUdmzS13MW4iFWfLJOBx/4RfF4JjU2rzurUTWrkRU WukJznb3qbHguaXL6XkvZFnX17PEWEW49EHYJQbSMYMg7JQ2o624TO3oSRMWEtiqjVVX VKuUVdNC9+kXhJLvWgQ9xPT2pHFTr7FxII6pJPFYV7ewORxlaL0ZPEhsEx3ZcOy+80zD 1KImd2nMgEyV1xF+HAHIpaGDj3cOjuMyDS3yZvU7iUl6cMJyCUK/2pIZ0WTO3yq0M+mw EQqhoXFauChymRj+Zr44yXUAviE34ReNDM1p6oyfTHaSE80bePG0ZBBd8SRzJV0BGOS8 KC7A== X-Gm-Message-State: AOAM532g+B2mH4gsbviEKrQl14bvKzauLQlSaBvWwOHaesM5lE+AuHH3 EE0dnNFS9Z06QXK3dV2cNWQ= X-Google-Smtp-Source: ABdhPJyS7ftMEF/xsFmdK0Wat9VKq3jB5YuLN83Faf1UBZGxDO180LmfYZFu98qs8MOXunX6jK9DkQ== X-Received: by 2002:a62:5bc1:0:b029:20d:69a5:189 with SMTP id p184-20020a625bc10000b029020d69a50189mr6216012pfb.57.1618299422983; Tue, 13 Apr 2021 00:37:02 -0700 (PDT) Received: from edumazet1.svl.corp.google.com ([2620:15c:2c4:201:71d7:d843:bfe8:bec7]) by smtp.gmail.com with ESMTPSA id a3sm1349068pjq.36.2021.04.13.00.37.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Apr 2021 00:37:02 -0700 (PDT) From: Eric Dumazet To: Ingo Molnar , Mathieu Desnoyers , Peter Zijlstra Cc: "Paul E . McKenney" , Boqun Feng , Arjun Roy , linux-kernel , Eric Dumazet , Eric Dumazet Subject: [PATCH 0/3] rseq: minor optimizations Date: Tue, 13 Apr 2021 00:36:54 -0700 Message-Id: <20210413073657.2308450-1-eric.dumazet@gmail.com> X-Mailer: git-send-email 2.31.1.295.g9ea45b61b8-goog MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Eric Dumazet rseq is a heavy user of copy to/from user data in fast paths. This series tries to reduce the cost. Eric Dumazet (3): rseq: optimize rseq_update_cpu_id() rseq: remove redundant access_ok() rseq: optimise for 64bit arches kernel/rseq.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) -- 2.31.1.295.g9ea45b61b8-goog