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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