linux-kernel - [PATCH v3 01/15] KVM: x86: clean up and optimize for kvm_arch_free

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Date:	Tue, 16 Apr 2013 14:32:39 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	mtosatti@...hat.com
Cc:	gleb@...hat.com, avi.kivity@...il.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Subject: [PATCH v3 01/15] KVM: x86: clean up and optimize for kvm_arch_free_memslot

memslot rmap and lpage-info are never partly reused and nothing need
be freed when new memslot is created

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 arch/x86/kvm/x86.c |   21 ++++++++++++---------
 1 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4be4733..b0be7ec 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6856,19 +6856,22 @@ void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 {
 	int i;
 
+	if (dont && dont->arch.rmap[0] == free->arch.rmap[0])
+		return;
+
+	/* It is a empty memslot. */
+	if (!free->arch.rmap[0])
+		return;
+
 	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
-		if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) {
-			kvm_kvfree(free->arch.rmap[i]);
-			free->arch.rmap[i] = NULL;
-		}
+		kvm_kvfree(free->arch.rmap[i]);
+		free->arch.rmap[i] = NULL;
+
 		if (i == 0)
 			continue;
 
-		if (!dont || free->arch.lpage_info[i - 1] !=
-			     dont->arch.lpage_info[i - 1]) {
-			kvm_kvfree(free->arch.lpage_info[i - 1]);
-			free->arch.lpage_info[i - 1] = NULL;
-		}
+		kvm_kvfree(free->arch.lpage_info[i - 1]);
+		free->arch.lpage_info[i - 1] = NULL;
 	}
 }
 
-- 
1.7.7.6

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