Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752086AbcCGDci (ORCPT ); Sun, 6 Mar 2016 22:32:38 -0500 Received: from mail-pf0-f174.google.com ([209.85.192.174]:34391 "EHLO mail-pf0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751641AbcCGDce (ORCPT ); Sun, 6 Mar 2016 22:32:34 -0500 Subject: Re: [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup ino To: Tejun Heo References: <1456996137-8354-1-git-send-email-yang.shi@linaro.org> <20160304125224.GG13868@htj.duckdns.org> Cc: gregkh@linuxfoundation.org, lizefan@huawei.com, tglx@linutronix.de, rostedt@goodmis.org, bigeasy@linutronix.de, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, linaro-kernel@lists.linaro.org From: "Shi, Yang" Message-ID: <56DCF64A.3070409@linaro.org> Date: Sun, 6 Mar 2016 19:32:26 -0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <20160304125224.GG13868@htj.duckdns.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 633 Lines: 20 Hi Steven, Any comment on this one? I'm supposed it will be taken by your tracing tree? Thanks, Yang On 3/4/2016 4:52 AM, Tejun Heo wrote: > On Thu, Mar 03, 2016 at 01:08:57AM -0800, Yang Shi wrote: >> commit 5634cc2aa9aebc77bc862992e7805469dcf83dac ("writeback: update writeback >> tracepoints to report cgroup") made writeback tracepoints print out cgroup >> path when CGROUP_WRITEBACK is enabled, but it may trigger the below bug on -rt >> kernel since kernfs_path and kernfs_path_len are called by tracepoints, which >> acquire spin lock that is sleepable on -rt kernel. > > Acked-by: Tejun Heo > > Thanks. >