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Subject: Re: [PATCH v6] add MAP_UNLOCKED mmap flag
From: Minchan Kim <minchan.kim@gmail.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       linux-mm@kvack.org, kosaki.motohiro@jp.fujitsu.com,
       linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
       akpm@linux-foundation.org, andrew.c.morrow@gmail.com,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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Date: Tue, 19 Jan 2010 23:07:23 +0900
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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