linux-kernel - Re: [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup ino

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Message-ID: <20160304125224.GG13868@htj.duckdns.org>
Date:	Fri, 4 Mar 2016 07:52:24 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	gregkh@...uxfoundation.org, lizefan@...wei.com, tglx@...utronix.de,
	rostedt@...dmis.org, bigeasy@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup
 ino

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 <tj@...nel.org>

Thanks.

-- 
tejun