linux-kernel - Re: [PATCH v7 04/11] KVM: MMU: zap pages in batch

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Message-ID: <20130524203432.GB4525@amt.cnet>
Date:	Fri, 24 May 2013 17:34:32 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	gleb@...hat.com, avi.kivity@...il.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v7 04/11] KVM: MMU: zap pages in batch

On Thu, May 23, 2013 at 03:55:53AM +0800, Xiao Guangrong wrote:
> Zap at lease 10 pages before releasing mmu-lock to reduce the overload
> caused by requiring lock
> 
> After the patch, kvm_zap_obsolete_pages can forward progress anyway,
> so update the comments
> 
> [ It improves kernel building 0.6% ~ 1% ]

Can you please describe the overload in more detail? Under what scenario
is kernel building improved?

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