linux-kernel - Re: [PATCH v2 0/7] KVM: MMU: fast zap all shadow pages

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Date:	Fri, 22 Mar 2013 18:01:53 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, gleb@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 0/7] KVM: MMU: fast zap all shadow pages

On 03/22/2013 10:11 AM, Xiao Guangrong wrote:

>> The modifications should be contained to kvm_mmu_get_page() mostly,
>> correct? (would also have to keep counters to increase SLAB freeing 
>> ratio, relative to number of outdated shadow pages).
> 
> Yes.
> 
>>
>> And then have codepaths that nuke shadow pages break from the spinlock,
> 
> I think this is not needed any more. We can let mmu_notify use the generation
> number to invalid all shadow pages, then we only need to free them after
> all vcpus down and mmu_notify unregistered - at this point, no lock contention,
> we can directly free them.

Sorry. This is wrong since after call ->release(), the memory will be
freed. zap-all-sp can not be delayed. Will think out a good way to handle this...


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