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

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Message-ID: <20100119141436.GA5238@redhat.com>
Date:	Tue, 19 Jan 2010 16:14:36 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	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>
Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag

On Tue, Jan 19, 2010 at 11:07:23PM +0900, Minchan Kim wrote:
> On Tue, 2010-01-19 at 09:52 +0200, Gleb Natapov wrote:
> 
> > In my case (virtualization) I want to test/profile guest under heavy swapping
> > of a guests memory, so I intentionally create memory shortage by creating
> 
> You mean "guest memory" that is area emulated DRAM in qemu?
> It is anonymous vma. 
> 
> > guest much large then host memory, but I want system to swap out only
> > guest's memory.
> 
> Couldn't you use MADV_SEQUENTIAL on only guest memory area?
> It doesn't make side effect about readahead since it's anon area. 
> And it would make do best effort to swap out guest's memory.
> 
I can try, should be better then nothing I guess. Doesn't guaranty that
emulator memory will not be swapped out though.

--
			Gleb.
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