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

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Date:	Mon, 14 Jan 2013 11:15:24 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>
Cc:	mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7 -v2] KVM: Alleviate mmu_lock hold time when we start
 dirty logging

On Tue, Jan 08, 2013 at 07:42:38PM +0900, Takuya Yoshikawa wrote:
> 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.
> 
Applied, thanks.

> 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

--
			Gleb.
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