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Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs
Date 2016-08-08 12:30 +0200
Message-ID <s3PYK-7f-35@gated-at.bofh.it> (permalink)
References (2 earlier) <s2c3n-85c-13@gated-at.bofh.it> <s2c3n-85c-11@gated-at.bofh.it> <s2rF8-1SU-33@gated-at.bofh.it> <s2rF8-1SU-31@gated-at.bofh.it> <s3PYK-7f-37@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri, Aug 05, 2016 at 10:41:33AM -0700, Bart Van Assche wrote:
> On 08/04/2016 07:09 AM, Peter Zijlstra wrote:

> >But I'd still like to understand where we loose the wakeup.
> 
> My assumption is that __wake_up_common() and signal delivery happen
> concurrently, that __wake_up_common() wakes up bit_wait_io() and that signal
> delivery happens after bit_wait_io() has been woken up but before it tests
> the signal pending state.

That would be the exact scenario I drew a picture of, no? I'm still
failing to see the hole there.

Please draw a picture like that and illustrate the hole.

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Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Peter Zijlstra <peterz@infradead.org> - 2016-08-03 21:50 +0200
  Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-03 23:40 +0200
    Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Peter Zijlstra <peterz@infradead.org> - 2016-08-04 16:20 +0200
      Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Peter Zijlstra <peterz@infradead.org> - 2016-08-08 12:30 +0200
        Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Bart Van Assche <bvanassche@acm.org> - 2016-08-08 16:40 +0200
          Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-08 18:30 +0200
            Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-09 19:20 +0200
              Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-10 21:00 +0200
              Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-10 21:10 +0200
            Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Peter Zijlstra <peterz@infradead.org> - 2016-08-10 21:20 +0200
            Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-10 23:30 +0200

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