Paolo Bonzini <[email protected]> wrote: > On 02/11/2015 08:36, Liang Li wrote: >> The patch 3ea3b7fa9af067982f34b of kvm introduces a lazy collapsing >> of small sptes into large sptes mechanism, which intend to solve the >> performance drop issue if live migration fails or is canceled. The >> rmap will be scanned in the KVM_SET_USER_MEMORY_REGION ioctl context >> when dirty logging is stopped so as to drop the small sptes, scanning >> the rmap and drop the small sptes is a time consuming operation which >> will take dozens of milliseconds, the actual time depends on VM's >> memory size. For a VM with 8GB RAM, it will take about 30ms. > > I'm okay with these patches. Juan, can they be included in 2.5?
Applied, thanks. > > However, the KVM patch is a regression too. Wanpeng, can you look into > doing the collapsing from a work item? > > Thanks, > > Paolo
