From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Date: Fri, 31 May 2013 00:36:29 +0000 (+0800)
Subject: KVM: MMU: reclaim the zapped-obsolete page first
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~22^2~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=365c886860c4ba670d245e762b23987c912c129a;p=pandora-kernel.git

KVM: MMU: reclaim the zapped-obsolete page first

As Marcelo pointed out that
| "(retention of large number of pages while zapping)
| can be fatal, it can lead to OOM and host crash"

We introduce a list, kvm->arch.zapped_obsolete_pages, to link all
the pages which are deleted from the mmu cache but not actually
freed. When page reclaiming is needed, we always zap this kind of
pages first.

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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