KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file

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Use this file to dump rmap statistic information.  The statistic is done by
calculating the rmap count and the result is log-2-based.

An example output of this looks like (idle 6GB guest, right after boot linux):

Rmap_Count:     0       1       2-3     4-7     8-15    16-31   32-63   64-127  128-255 256-511 512-1023
Level=4K:       3086676 53045   12330   1272    502     121     76      2       0       0       0
Level=2M:       5947    231     0       0       0       0       0       0       0       0       0
Level=1G:       32      0       0       0       0       0       0       0       0       0       0

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20210730220455.26054-5-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Peter Xu 2021-07-30 18:04:52 -04:00 • committed by Paolo Bonzini

parent 4139b1972a

commit 3bcd0662d6

3 changed files with 132 additions and 0 deletions

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111

arch/x86/kvm/debugfs.c

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20

arch/x86/kvm/mmu/mmu.c

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1

arch/x86/kvm/mmu/mmu_internal.h

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