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

[Shi, Yang]

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@xxxxxxxxxx>
>
> Thanks.