linux-kernel - Re: [PATCH v6] add MAP

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Message-ID: <20100119132608.GQ14345@redhat.com>
Date:	Tue, 19 Jan 2010 15:26:08 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-mm@...ck.org,
	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org, akpm@...ux-foundation.org,
	andrew.c.morrow@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag

On Tue, Jan 19, 2010 at 03:18:11PM +0200, Pekka Enberg wrote:
> On Tue, Jan 19, 2010 at 2:48 PM, Minchan Kim <minchan.kim@...il.com> wrote:
> > Gleb. How about using MADV_SEQUENTIAL on guest memory?
> > It makes that pages of guest are moved into inactive reclaim list more
> > fast. It means it is likely to swap out faster than other pages if it
> > isn't hit during inactive list.
> 
> Yeah, something like that but we don't want the readahead. OTOH, it's
> not clear what Gleb's real problem is. Are the guest address spaces
> anonymous or file backed?
Anonymous.

>                           Which parts of the emulator are swapped out
> that are causing the problem?
I don't want anything that can be used during guest runtime to be
swapped out. And I run 2G guest in 512M container, so eventually
everything is swapped out :)

>                                Maybe it's a VM balancing issue that
> mlock papers over?
> 
There is no problem. I do measurements on how host swapping affects
guest and I don't want qemu code to be swapped out.

--
			Gleb.
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