linux-kernel - [PATCH 0/7 -v2] KVM: Alleviate mmu_lock hold time when we start dirty logging

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Date:	Tue, 8 Jan 2013 19:42:38 +0900
From:	Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>
To:	mtosatti@...hat.com, gleb@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/7 -v2] KVM: Alleviate mmu_lock hold time when we start
 dirty logging

Changelog v1->v2:
  The condition in patch 1 was changed like this:
    npages && (mem->flags & KVM_MEM_LOG_DIRTY_PAGES)

This patch set makes kvm_mmu_slot_remove_write_access() rmap based and
adds conditional rescheduling to it.

The motivation for this change is of course to reduce the mmu_lock hold
time when we start dirty logging for a large memory slot.  You may not
see the problem if you just give 8GB or less of the memory to the guest
with THP enabled on the host -- this is for the worst case.

Takuya Yoshikawa (7):
  KVM: Write protect the updated slot only when dirty logging is enabled
  KVM: MMU: Remove unused parameter level from __rmap_write_protect()
  KVM: MMU: Make kvm_mmu_slot_remove_write_access() rmap based
  KVM: Remove unused slot_bitmap from kvm_mmu_page
  KVM: Make kvm_mmu_change_mmu_pages() take mmu_lock by itself
  KVM: Make kvm_mmu_slot_remove_write_access() take mmu_lock by itself
  KVM: MMU: Conditionally reschedule when kvm_mmu_slot_remove_write_access() takes a long time

 Documentation/virtual/kvm/mmu.txt |    7 ----
 arch/x86/include/asm/kvm_host.h   |    5 ---
 arch/x86/kvm/mmu.c                |   56 +++++++++++++++++++-----------------
 arch/x86/kvm/x86.c                |   12 ++++---
 virt/kvm/kvm_main.c               |    1 -
 5 files changed, 37 insertions(+), 44 deletions(-)

-- 
1.7.5.4

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