On Fri, Aug 26, 2011 at 11:18:01AM +0800, Xiao Guangrong wrote: > On 08/25/2011 09:47 PM, Marcelo Tosatti wrote: > > > I guess it is OK to be more trigger happy with zapping by ignoring > > the accessed bit, clearing the flood counter on page fault. > > > > Yeah, i like this way, is this patch good for you? Looks fine, can you rerun kernbench? > ================================ > Subject: [PATCH 11/11] KVM: MMU: improve write flooding detected > > Detecting write-flooding does not work well, when we handle page written, if > the last speculative spte is not accessed, we treat the page is > write-flooding, however, we can speculative spte on many path, such as pte > prefetch, page synced, that means the last speculative spte may be not point > to the written page and the written page can be accessed via other sptes, so > depends on the Accessed bit of the last speculative spte is not enough > > Instead of detected page accessed, we can detect whether the spte is accessed > after it is written, if the spte is not accessed but it is written frequently, > we treat is not a page table or it not used for a long time > > Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
