KVM: MMU: Avoid handling same rmap_pde in kvm_handle_hva_range()

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When we invalidate a THP page, we call the handler with the same
rmap_pde argument 512 times in the following loop:

  for each guest page in the range
    for each level
      unmap using rmap

This patch avoids these extra handler calls by changing the loop order
like this:

  for each level
    for each rmap in the range
      unmap using rmap

With the preceding patches in the patch series, this made THP page
invalidation more than 5 times faster on our x86 host: the host became
more responsive during swapping the guest's memory as a result.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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This commit is contained in:

Takuya Yoshikawa 2012-07-02 17:59:33 +09:00 • committed by Marcelo Tosatti

parent f395302e09

commit bcd3ef5828

1 changed files with 18 additions and 10 deletions

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arch/x86/kvm/mmu.c

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