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

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Message-Id: <20081024144138.9C4C.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Fri, 24 Oct 2008 14:51:32 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	kosaki.motohiro@...fujitsu.com,
	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.

Yup, thanks.

I also think my way is the best solustion of 2.6.28 age.
and I should work on your better solution for long term.




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