From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Date: Mon, 2 Jul 2012 08:56:33 +0000 (+0900)
Subject: KVM: Introduce kvm_unmap_hva_range() for kvm_mmu_notifier_invalidate_range_start()
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~15^2~101^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3ae2096974b12c3af2ad1a4e7716b084949867f;p=pandora-kernel.git

KVM: Introduce kvm_unmap_hva_range() for kvm_mmu_notifier_invalidate_range_start()

When we tested KVM under memory pressure, with THP enabled on the host,
we noticed that MMU notifier took a long time to invalidate huge pages.

Since the invalidation was done with mmu_lock held, it not only wasted
the CPU but also made the host harder to respond.

This patch mitigates this by using kvm_handle_hva_range().

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Cc: Alexander Graf <agraf@suse.de>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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