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authorWanpeng Li <wanpeng.li@linux.intel.com>2015-04-03 15:40:25 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2015-04-08 10:47:04 +0200
commit3ea3b7fa9af067982f34b6745584558821eea79d (patch)
tree64029d66d8a1179310bd61b1dadc9ae7dca2d93c /virt
parent1119022c71fb11826041787cf0ebffc1a1b0ba5b (diff)
kvm: mmu: lazy collapse small sptes into large sptes
Dirty logging tracks sptes in 4k granularity, meaning that large sptes have to be split. If live migration is successful, the guest in the source machine will be destroyed and large sptes will be created in the destination. However, the guest continues to run in the source machine (for example if live migration fails), small sptes will remain around and cause bad performance. This patch introduce lazy collapsing of small sptes into large sptes. The rmap will be scanned in ioctl context when dirty logging is stopped, dropping those sptes which can be collapsed into a single large-page spte. Later page faults will create the large-page sptes. Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> Message-Id: <1428046825-6905-1-git-send-email-wanpeng.li@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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