Re: [PATCH v1] KVM: stats: Add VM stat for the cumulative number of dirtied pages

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On 12/08/21 01:37, Jing Zhang wrote:
A per VM stat dirty_pages is added to record the number of dirtied pages
in the life cycle of a VM.
The growth rate of this stat is a good indicator during the process of
live migrations. The exact number of dirty pages at the moment doesn't
matter. That's why we define dirty_pages as a cumulative counter instead
of an instantaneous one.

Why not make it a per-CPU stat? mark_page_dirty_in_slot can use kvm_get_running_vcpu() and skip the logging in the rare case it's NULL.

Paolo




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