On 07/13/2010 07:25 AM, Xiao Guangrong wrote:
Regressions? no. Or do you mean the problem already exists? Where?
I mean this is a exist problem, likes invlpg, pte-write and sync-page, there are
speculative path that it's not real access, but marked dirty if pte is writable.
Right. We should fix those too.
Prefetch is much more worrying though, especially with ept. If a guest
is using just 1/8 of the pages, it can look to migration as if it's
using 100% of the pages. The impact can be pretty large.
In contrast, I'm not too worried about invlpg, as most times an access
will follow a miss, and usually a write access if we set a writeable
pte. Not sure about sync-page.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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