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

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Date:	Sun, 6 Mar 2016 19:32:26 -0800
From:	"Shi, Yang" <yang.shi@...aro.org>
To:	Tejun Heo <tj@...nel.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

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 <tj@...nel.org>
>
> Thanks.
>