KVM: x86/mmu: Revert "Revert "KVM: MMU: zap pages in batch""

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Now that the fast invalidate mechanism has been reintroduced, restore
the performance tweaks for fast invalidation that existed prior to its
removal.

Paraphrashing the original changelog:

  Zap at least 10 shadow pages before releasing mmu_lock to reduce the
  overhead associated with re-acquiring the lock.

  Note: "10" is an arbitrary number, speculated to be high enough so
  that a vCPU isn't stuck zapping obsolete pages for an extended period,
  but small enough so that other vCPUs aren't starved waiting for
  mmu_lock.

This reverts commit 43d2b14b10.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2019-09-12 19:46:07 -07:00 • committed by Paolo Bonzini

parent 14a3c4f498

commit fbb158cb88

1 changed files with 9 additions and 26 deletions

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arch/x86/kvm/mmu.c

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