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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,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 BA0FBC43603 for ; Fri, 20 Dec 2019 16:59:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8905520866 for ; Fri, 20 Dec 2019 16:59:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576861152; bh=YhOx7vHjL5MFGI+9Bd40FTXLwMa4kVWMFOswf4gxlz4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=gYeBpmmv0/235ZNowf7NdKOtIAUZ2rMsXsFs/7n0wMA4g767HryfoegdTYFazQJMu v3gbsfq+7KMymhoWC0un2rrsTks1zaasybsBKvhmizIIZvo3whePWsB21nvz+HvarW ZpF0rsRIJd5QW4ycyur/W9fW9zTxr1lrpcBxXuLQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727411AbfLTQ7L (ORCPT ); Fri, 20 Dec 2019 11:59:11 -0500 Received: from mail-qk1-f195.google.com ([209.85.222.195]:41564 "EHLO mail-qk1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727270AbfLTQ7L (ORCPT ); Fri, 20 Dec 2019 11:59:11 -0500 Received: by mail-qk1-f195.google.com with SMTP id x129so8165349qke.8; Fri, 20 Dec 2019 08:59:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=TFNV1NWSFuHpHDbvDJbGCGSFQdkbgmzuIkzgxcz14KU=; b=L1Mxw7+ebCI/ROK7u570qmJ8bGHUsrG8/Iwh3dpXvWg1TfIpiGzBjILCSzJ6a6wAy0 3aVTsR0KbvVJopGVOTtaQvm8iAtt2bjr1nYkVdtTV+nq1R3XvGoQFDF7TCZnt39huZ+q wELoGq/f5eCv12Rk1MldkTz6PaKz5w8VncaTrTKzUQAQCCocV2Rjzkrkvgx83Kqh55hV 4yD2EGEXPLmv6T2J8KKMbFcDtb6fDaxO5P4Na7MzaOhoGV1yZffam1dksQcIbxajbpuV 37SmUvMpzmeNvtQp6965SmYj+/3/h2l063bsfav5vEuM5eF5Hs5zm2SrPKW/6t36pyeY XprQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=TFNV1NWSFuHpHDbvDJbGCGSFQdkbgmzuIkzgxcz14KU=; b=qZdr3Q1kxFChlRSGFhhMIwmWykND6pL3/SV5mz79y2DTPL1x51y6OKpF9lPA8Tj/Zg uFgNS+pmQI8y336m8pkW5jsuflxdb5Mg6BkhGKfMdzUHyitlvIKLJT/kJiQSOKR/Z0og CvEi3o7bLjcofXR7NtzsYinjh/AVPeHaf2ikmS8pkedlwBvQJ55F2m7nLr1qZGLSIZFX zuweCYM6JPhR4YGzNSKmp28kDqYxpd7p3YkTCGSaA2lk/RNNmtG0FPHqAJzTDsVe8HUb k8NaqC5GFUWNnzj1mpI7Sy7V8CA5HcCav7kUjfh5fxL+0dcyvCJJIgybj575HJMmuUVv F1hA== X-Gm-Message-State: APjAAAWZx9sy/bOFpi69MMhSvwiNLO04pQX4f4SY4ww/ss/maQdBFV4F JgrWwAWX0DRYg2IKTVmJJf4pAAhSKTI= X-Google-Smtp-Source: APXvYqz7aFmfMyObL+0ikFUH0+DkYP1GcmtMmTR601QkVR1ssJsY2OznXxNfcvKC2nobxj4PRGMXqA== X-Received: by 2002:a05:620a:133a:: with SMTP id p26mr14265229qkj.50.1576861149971; Fri, 20 Dec 2019 08:59:09 -0800 (PST) Received: from localhost ([2620:10d:c091:480::11e7]) by smtp.gmail.com with ESMTPSA id t73sm3052987qke.71.2019.12.20.08.59.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Dec 2019 08:59:09 -0800 (PST) Date: Fri, 20 Dec 2019 08:59:07 -0800 From: Tejun Heo To: Peter Zijlstra Cc: Namhyung Kim , Ingo Molnar , Arnaldo Carvalho de Melo , Jiri Olsa , Alexander Shishkin , Mark Rutland , Stephane Eranian , LKML , linux-perf-users@vger.kernel.org, Li Zefan , Johannes Weiner Subject: Re: [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Message-ID: <20191220165907.GI2914998@devbig004.ftw2.facebook.com> References: <20191220043253.3278951-1-namhyung@kernel.org> <20191220043253.3278951-3-namhyung@kernel.org> <20191220152324.GG2914998@devbig004.ftw2.facebook.com> <20191220164802.GO2827@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191220164802.GO2827@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 20, 2019 at 05:48:02PM +0100, Peter Zijlstra wrote: > That assumes the cgroup is still in existence, which might not be the > case I presume. Yeah, if the cgroup is already gone by the time the first event is looked up, this wouldn't work. -- tejun