From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Shi, Yang" Subject: Re: [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup ino Date: Sun, 6 Mar 2016 19:32:26 -0800 Message-ID: <56DCF64A.3070409@linaro.org> References: <1456996137-8354-1-git-send-email-yang.shi@linaro.org> <20160304125224.GG13868@htj.duckdns.org> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit 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 To: Tejun Heo Return-path: Received: from mail-pf0-f180.google.com ([209.85.192.180]:36182 "EHLO mail-pf0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751798AbcCGDce (ORCPT ); Sun, 6 Mar 2016 22:32:34 -0500 Received: by mail-pf0-f180.google.com with SMTP id 63so71322176pfe.3 for ; Sun, 06 Mar 2016 19:32:34 -0800 (PST) In-Reply-To: <20160304125224.GG13868@htj.duckdns.org> Sender: linux-rt-users-owner@vger.kernel.org List-ID: 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. >