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

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Message-ID: <1263910043.2163.24.camel@barrios-desktop>
Date:	Tue, 19 Jan 2010 23:07:23 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Gleb Natapov <gleb@...hat.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, 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.


-- 
Kind regards,
Minchan Kim

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