linux-kernel - Re: [PATCH tip/core/rcu 01/11] mm: Place preemption point in do

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Message-Id: <20130924211047.57f9d9c8.akpm@linux-foundation.org>
Date:	Tue, 24 Sep 2013 21:10:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	mathieu.desnoyers@...icios.com, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, sbw@....edu,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH tip/core/rcu 01/11] mm: Place preemption point in
 do_mlockall() loop

On Tue, 24 Sep 2013 18:29:11 -0700 "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> 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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