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:

quoted

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. 

quoted

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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