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From: "Shi, Yang" <yang.shi@linaro.org>
To: Tejun Heo <tj@kernel.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
Subject: Re: [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup ino
Date: Sun, 6 Mar 2016 19:32:26 -0800	[thread overview]
Message-ID: <56DCF64A.3070409@linaro.org> (raw)
In-Reply-To: <20160304125224.GG13868@htj.duckdns.org>

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@kernel.org>
>
> Thanks.
>


  reply	other threads:[~2016-03-07  3:32 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-03  9:08 [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup ino Yang Shi
2016-03-04 12:52 ` Tejun Heo
2016-03-07  3:32   ` Shi, Yang [this message]
2016-03-07 14:03     ` Steven Rostedt
2016-03-29 14:30       ` Sebastian Andrzej Siewior

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