On 06/29/2012 01:39 AM, Avi Kivity wrote:
> But I still think it's the right thing since it simplifies the code.
> Maybe we should add a prefetch() on write_count do mitigate the
> overhead, if it starts showing up in profiles.
>
Long time ago, there was a discussion about dropping prefetch in the
operation of list walking:
http://lwn.net/Articles/444336/
IIRC, the conclusion is that it is better to let CPU prefetch memory
by itself.
Actually, when i developed lockless spte walking, i measure the performance if
prefetch was used, but i did not see the improvement.
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