On Wednesday 22 June 2011 08:46:08 you wrote:

* Nai Xia (nai.xia@gmail.com) wrote:

quoted

Compared to the first version, this patch set addresses the problem of
dirty bit updating of virtual machines, by adding two mmu_notifier interfaces.
So it can now track the volatile working set inside KVM guest OS.

V1 log:
Currently, ksm uses page checksum to detect volatile pages. Izik Eidus 
suggested that we could use pte dirty bit to optimize. This patch series
adds this new logic.

Preliminary benchmarks show that the scan speed is improved by up to 16 
times on volatile transparent huge pages and up to 8 times on volatile 
regular pages.

Did you run this only in the host (which would not trigger the notifiers
to kvm), or also run your test program in a guest?

Yeah, I did run the test program in guest but I mean the top speed is measured in
host. i.e. I do confirm the ksmd can skip the pages of this test in guest OS 
but did not measure the speed up on guest.

Thanks, 

Nai

thanks,
-chris

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