On Monday 28 March 2011 22:59:02 Izik Eidus wrote: > On 03/28/2011 04:14 PM, Nai Xia wrote: > > 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. > > > > Hi, > > One small note: > When kvm will use ksm on intel cpu with extended page tables support, > the cpu won`t track > dirty bit, therefore the calc_hash() logic should be used in such cases > (untill intel will fadd this support in their cpus)... > > Moreover I think that even though that AMD nested page tables does > update dirty bit, you still need > to sync it with the host page table using mmu notifiers ? > > (Not that on regular application use case of ksm any of this should be > an issue) > > Hmm, I will consider these two issues in the next version. Thanks for input! Nai -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>