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=-6.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 93AD4C432BE for ; Tue, 31 Aug 2021 03:24:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F6A160F4B for ; Tue, 31 Aug 2021 03:24:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239493AbhHaDZO (ORCPT ); Mon, 30 Aug 2021 23:25:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235848AbhHaDZM (ORCPT ); Mon, 30 Aug 2021 23:25:12 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28042C061575 for ; Mon, 30 Aug 2021 20:24:18 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id bg1so4481045plb.13 for ; Mon, 30 Aug 2021 20:24:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=Nh8QbybUxMKQlOPkd+HKBg02cmIy6cujpaQR8rotc4c=; b=DX8HU5l4DeZ83daIwHgTk1M+kD/9wXnm/Y3mlgSXciOJy/yAoEnXXGQv8cL2MUHnmv k40lHE3qKlnMyO7w7HFsF+yK/2WgjlBkHPYjfRegABp4hadlK2cEFzvpM0q16nhsHGuy Ak2k8DNLBXrgp5q0EslxY5jf6rEZ1fEqq57PlY/7q00PlDm1jQrFPDJ3dTaASASvBfGd NrF22aoRZ1gDQdE86fcuJ26HqB7XYTfplG/NMAfAbA6jyHghovXU1Ia40r+nKqEU1Zsq Idui2ye6uTIdgjIZCciVyjNCl2Hk4xoyp/XpKHAvnaQA1j/kUodvQIJaczc2zlWQCcNe e/rA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Nh8QbybUxMKQlOPkd+HKBg02cmIy6cujpaQR8rotc4c=; b=ZSNCderR9ceRtEVOO9xARjdOyIVh/Pkixpplzyv5O4DoN8mTOFhKUZ2tCTAJOdZStn WXtnr814oJLiraFJGJ8XeErfnyHj/NajUD00TOSze1p4l9zkRrcnR3G2K4WfYRPfyRsQ zZIdZ7yRClGnu4j7rdNaTVpk7WJfICDOvORItcTlngjP5ehCKbSqCmpbR0t/v1ysKtZw 1LB7T9x1yaPZl/Oi3HmfOtbVEBlKsGLnKtf6d+P3YdWVARcT51rQxxyLPAomYW37oL8S fOGyoksZvfjdfBILzl51d++bhRanWbGBZ0nBbZOYWRxeR9r/jImKcCh4GyCK+8/afYIP STlg== X-Gm-Message-State: AOAM531FwiqAVYFuuSAebM37/vVN76z2y2I2Umrsvp02tPY6v8JUAUx5 B9zyuu30wdL5zwB/CaoT34Lv9g== X-Google-Smtp-Source: ABdhPJx1b/+PRDoFjIZKp9RsshBFxphB5OqcNMFTBdZUyMKJ1Lh7iLDocREeBTy+tvzUbK//JcQ+wg== X-Received: by 2002:a17:90a:bb0b:: with SMTP id u11mr2717140pjr.18.1630380257768; Mon, 30 Aug 2021 20:24:17 -0700 (PDT) Received: from [10.76.43.53] ([61.120.150.72]) by smtp.gmail.com with ESMTPSA id a15sm15637611pfn.219.2021.08.30.20.24.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Aug 2021 20:24:17 -0700 (PDT) Subject: Re: [PATCH 3/3] mm: mmap_lock: add ip to mmap_lock tracepoints From: Gang Li To: Steven Rostedt Cc: Ingo Molnar , Andrew Morton , Vlastimil Babka , LKML , Linux MM References: <20210729092853.38242-1-ligang.bdlg@bytedance.com> <585f936d-9d27-a481-f590-bd07f98f34de@bytedance.com> <20210730160319.6dfeaf7a@oasis.local.home> <89c20b62-c0ab-3200-fb33-eb2058b7ba67@bytedance.com> Message-ID: <4cded873-3706-8d2c-765c-5c896aa13714@bytedance.com> Date: Tue, 31 Aug 2021 11:24:12 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Steven! Sorry to bother you ;) (I resend this email because the last one was not cc to mailing list.) It has been ten days since my last email. What's your opinion about my patch "[PATCH 3/3] mm: mmap_lock: add ip to mmap_lock tracepoints"? Briefly, lock events are so frequent that ip collection and lock event collection cannot be separated, otherwise it will cause the wrong order of data. I am developing a tool to analyze mmap_lock contend using this feature. Adding ip to mmap_lock tracepoints is quite convenient. Sorry to bother you again. Hoping for your reply. Thanks! -- Gang On 8/20/21 2:18 AM, Gang Li wrote: > On 8/2/21 10:44 AM, Gang Li wrote: >> On 7/31/21 4:03 AM, Steven Rostedt wrote: >>> Yes, synthetic events are just like normal events, and have triggers, >>> stack traces, and do pretty much anything that another event can do. >>> > Hi! > > I find that sometimes the output data is out of order, which leads to inaccurate time stamps and make it hard to analyze.