Re: [RFC V4 PATCH] trace: writeback: replace cgroup path to cgroup ino
From: Tejun Heo <tj@kernel.org>
Date: 2016-03-04 12:52:30
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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. -- tejun