linux-kernel - Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each

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Message-ID: <20081024053402.GA11725@wotan.suse.de>
Date:	Fri, 24 Oct 2008 07:34:02 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org, Hugh Dickins <hugh@...itas.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>, linux-mm@...ck.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [RFC][PATCH] lru_add_drain_all() don't use schedule_on_each_cpu()

On Fri, Oct 24, 2008 at 02:29:18PM +0900, KOSAKI Motohiro wrote:
> > > > I don't see a better way to solve it, other than avoiding lru_add_drain_all
> > > 
> > > Well,
> > > 
> > > Unfortunately, lru_add_drain_all is also used some other VM place
> > > (page migration and memory hotplug).
> > > and page migration's usage is the same of this mlock usage.
> > > (1. grab mmap_sem  2.  call lru_add_drain_all)
> > > 
> > > Then, change mlock usage isn't solution ;-)
> > 
> > No, not mlock alone.
> 
> Ah, I see.
> It seems difficult but valuable. I'll think this way for a while.

Well, I think it would be nice if we can reduce lru_add_drain_all,
however your patch might be the least intrusive and best short term
solution.

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