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

[Tejun Heo]

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@xxxxxxxxxx>

Thanks.

-- 
tejun