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

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On 08/09, Bart Van Assche wrote:
>
> On 08/09/2016 10:15 AM, Oleg Nesterov wrote:
> >
> > --- x/kernel/sched/wait.c
> > +++ x/kernel/sched/wait.c
> > @@ -283,7 +283,7 @@ void abort_exclusive_wait(wait_queue_hea
> >  	if (!list_empty(&wait->task_list))
> >  		list_del_init(&wait->task_list);
> >  	else if (waitqueue_active(q))
> > -		__wake_up_locked_key(q, mode, key);
> > +		__wake_up_locked_key(q, TASK_NORMAL, key);
> >  	spin_unlock_irqrestore(&q->lock, flags);
> >  }
> >  EXPORT_SYMBOL(abort_exclusive_wait);
>
> Hello Oleg,
>
> That patch looks interesting to me.

And I'll redo/resend it, __wake_up_locked_key(mode) is simply wrong I think.

But it can't affect lock_page() because TASK_KILLABLE includes TASK_UNINTERRUPTIBLE
and we do not have lock_page_interruptible().


> Unfortunately even with that patch
> applied I still see lockups.

Thanks. I hoped this change can fix some another exclusive wait...

OK. Could you  try another debugging patch below?

Oleg.
---

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index e5a3244..9d5f892 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -711,6 +711,15 @@ static inline int page_has_private(struct page *page)
 	return !!(page->flags & PAGE_FLAGS_PRIVATE);
 }
 
+void unlock_page(struct page *page);
+static inline void __ClearPageLocked_x(struct page *page)
+{
+	if (PageLocked(compound_head(page)))
+		unlock_page(page);
+}
+
+#define __ClearPageLocked(page)	__ClearPageLocked_x(page)
+
 #undef PF_ANY
 #undef PF_HEAD
 #undef PF_NO_TAIL

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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 Oleg Nesterov <oleg@redhat.com> - 2016-08-11 19:40 +0200
                Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-12 18:20 +0200
                Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-13 18:40 +0200
                Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-16 15:10 +0200
                Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-17 19:40 +0200
                Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs Oleg Nesterov <oleg@redhat.com> - 2016-08-13 19:10 +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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