Re: [PATCH 0/1] KVM: make get dirty log ioctl return the first dirty page's position

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Avi Kivity wrote:

Result:
...
kvm_get_map(slot 0): r=    3, slot.len=    655360(2)
kvm_get_map(slot 1): r= 2044, slot.len= 535822336(2044)
kvm_get_map(slot 2): r=    1, slot.len=    131072(0)
kvm_get_map(slot 3): r=    1, slot.len=    131072(0)
kvm_get_map(slot 4): r=    1, slot.len=    131072(0)
kvm_get_map(slot 5): r=   64, slot.len=  16777216(64)
kvm_get_map(slot 6): r=    1, slot.len=     32768(0)
kvm_get_map(slot 7): r=    1, slot.len=     32768(0)
kvm_get_map(slot 0): r=    3, slot.len=    655360(2)
kvm_get_map(slot 1): r= 2044, slot.len= 535822336(2044)
kvm_get_map(slot 2): r=    1, slot.len=    131072(0)
kvm_get_map(slot 3): r=    1, slot.len=    131072(0)
kvm_get_map(slot 4): r=    1, slot.len=    131072(0)
kvm_get_map(slot 5): r=   64, slot.len=  16777216(64)
kvm_get_map(slot 6): r=    1, slot.len=     32768(0)
kvm_get_map(slot 7): r=    1, slot.len=     32768(0)
kvm_get_map(slot 0): r=    3, slot.len=    655360(2)
kvm_get_map(slot 1): r= 2044, slot.len= 535822336(2044)
kvm_get_map(slot 2): r=    1, slot.len=    131072(0)
kvm_get_map(slot 3): r=    1, slot.len=    131072(0)
kvm_get_map(slot 4): r=    1, slot.len=    131072(0)
kvm_get_map(slot 5): r=   64, slot.len=  16777216(64)
kvm_get_map(slot 6): r=    1, slot.len=     32768(0)
kvm_get_map(slot 7): r=    1, slot.len=     32768(0)
kvm_get_map(slot 0): r=    3, slot.len=    655360(2)
kvm_get_map(slot 1): r= 2044, slot.len= 535822336(2044)
kvm_get_map(slot 2): r=    1, slot.len=    131072(0)
kvm_get_map(slot 3): r=    1, slot.len=    131072(0)
kvm_get_map(slot 4): r=    1, slot.len=    131072(0)
kvm_get_map(slot 5): r=   64, slot.len=  16777216(64)
kvm_get_map(slot 6): r=    1, slot.len=     32768(0)
kvm_get_map(slot 7): r=    1, slot.len=     32768(0)
...

Seems to confirm - not much can be skipped.



>> kvm_get_map(slot 1): r= 2044, slot.len= 535822336(2044)
Am I wrong? in this case, the return value is suggesting
we can skip every 2044(the value in the bracket) bitmap check, right?






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