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

From Waiman Long <longman@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs ops
Date 2017-08-16 21:30 +0200
Message-ID <ufcaS-2DT-1@gated-at.bofh.it> (permalink)
References (3 earlier) <ufb58-21P-5@gated-at.bofh.it> <ufby9-2bt-1@gated-at.bofh.it> <ufbHQ-2eE-7@gated-at.bofh.it> <ufbRw-2wV-19@gated-at.bofh.it> <ufc1c-2Al-13@gated-at.bofh.it>
Organization Red Hat

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On 08/16/2017 03:14 PM, Steven Rostedt wrote:
> On Wed, 16 Aug 2017 15:07:25 -0400
> Waiman Long <longman@redhat.com> 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

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Thread

Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Steven Rostedt <rostedt@goodmis.org> - 2017-08-16 01:20 +0200
  Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Steven Rostedt <rostedt@goodmis.org> - 2017-08-16 20:20 +0200
    Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Waiman Long <longman@redhat.com> - 2017-08-16 20:50 +0200
      Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Steven Rostedt <rostedt@goodmis.org> - 2017-08-16 21:00 +0200
        Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Waiman Long <longman@redhat.com> - 2017-08-16 21:10 +0200
          Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Steven Rostedt <rostedt@goodmis.org> - 2017-08-16 21:20 +0200
            Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Waiman Long <longman@redhat.com> - 2017-08-16 21:30 +0200
  Re: [PATCH] blktrace: Fix potentail deadlock between delete & sysfs  ops Waiman Long <longman@redhat.com> - 2017-08-16 20:20 +0200

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