linux-kernel - Re: [patch 00/19] VM pageout scalability improvements

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Message-Id: <20080107190610.ed3be7b4.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 7 Jan 2008 19:06:10 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Eric Whitney <eric.whitney@...com>
Subject: Re: [patch 00/19] VM pageout scalability improvements

On Thu, 3 Jan 2008 12:00:00 -0500
Rik van Riel <riel@...hat.com> wrote:

> On Thu, 03 Jan 2008 11:52:08 -0500
> Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:
> 
> > Also, I should point out that the full noreclaim series includes a
> > couple of other patches NOT posted here by Rik:
> > 
> > 1) treat swap backed pages as nonreclaimable when no swap space is
> > available.  This addresses a problem we've seen in real life, with
> > vmscan spending a lot of time trying to reclaim anon/shmem/tmpfs/...
> > pages only to find that there is no swap space--add_to_swap() fails.
> > Maybe not a problem with Rik's new anon page handling.
> 
> If there is no swap space, my VM code will not bother scanning
> any anon pages.  This has the same effect as moving the pages
> to the no-reclaim list, with the extra benefit of being able to
> resume scanning the anon lists once swap space is freed.
> 
Is this 'avoiding scanning anon if no swap' feature  in this set ?

Thanks
-Kame

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