Re: [PATCH tip/core/rcu 01/11] mm: Place preemption point indo_mlockall() loop

[Andrew Morton]

On Tue, 24 Sep 2013 18:29:11 -0700 "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> --- a/mm/mlock.c
> +++ b/mm/mlock.c
> @@ -736,6 +736,7 @@ static int do_mlockall(int flags)
>  
>  		/* Ignore errors */
>  		mlock_fixup(vma, &prev, vma->vm_start, vma->vm_end, newflags);
> +		cond_resched();
>  	}
>  out:
>  	return 0;

Might need one in munlock_vma_pages_range() as well - it's a matter of
finding the right test case.  This will be neverending :(
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