Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs ops

[Waiman Long]

On 08/16/2017 03:14 PM, Steven Rostedt wrote:
> On Wed, 16 Aug 2017 15:07:25 -0400
> Waiman Long <longman@xxxxxxxxxx> wrote:
>
>
>> I am thinking about maybe letting a RT task to sleep a tiny amount of
>> time instead of calling schedule(). Hopefully, that will allow a
>> lower-priority task to make forward progress.
> That is actually one of the ugly hacks we have in the PREEMPT_RT patch
> (and one of the things we need to fix before getting it to mainline).
>
> A simple msleep(1).
>
> -- Steve


I am planning to use usleep_range(). That will allow a short sleep in
the us range instead of ms. The documentation suggest that for a
10us-20ms sleep.

Cheers,
Longman