From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Date: Fri, 31 May 2013 00:36:27 +0000 (+0800)
Subject: KVM: MMU: zap pages in batch
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~22^2~43
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e7d11c7a894986a13817c1c001e1e7668c5c4eb4;p=pandora-kernel.git

KVM: MMU: zap pages in batch

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 the case 0.6% ~ 1% that do kernel building meanwhile read
  PCI ROM. ]

Note: i am not sure that "10" is the best speculative value, i just
guessed that '10' can make vcpu do not spend long time on
kvm_zap_obsolete_pages and do not cause mmu-lock too hungry.

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
---

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