linux-kernel - Re: [PATCH v3 10/11] KVM: MMU: clear write-flooding on the fast path of tracked page

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Message-ID: <56CBE1C9.7070204@linux.intel.com>
Date:	Tue, 23 Feb 2016 12:36:25 +0800
From:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kai.huang@...ux.intel.com,
	jike.song@...el.com
Subject: Re: [PATCH v3 10/11] KVM: MMU: clear write-flooding on the fast path
 of tracked page



On 02/19/2016 07:55 PM, Paolo Bonzini wrote:
>
>
> On 14/02/2016 12:31, Xiao Guangrong wrote:
>> If the page fault is caused by write access on write tracked page, the
>> real shadow page walking is skipped, we lost the chance to clear write
>> flooding for the page structure current vcpu is using
>>
>> Fix it by locklessly waking shadow page table to clear write flooding
>> on the shadow page structure out of mmu-lock. So that we change the
>> count to atomic_t
>
> Should this be moved earlier in the series, so that the issue never
> surfaces?

Okay, i will move it to the place that is behind:
[PATCH v3 06/11] KVM: MMU: let page fault handler be aware tracked page