linux-kernel - [PATCH 41/52] KVM: Add statistic for remote tlb flushes

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Message-Id: <1198998638-22713-42-git-send-email-avi@qumranet.com>
Date:	Sun, 30 Dec 2007 09:10:27 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net
Subject: [PATCH 41/52] KVM: Add statistic for remote tlb flushes

Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 drivers/kvm/kvm.h      |    1 +
 drivers/kvm/kvm_main.c |    3 +++
 drivers/kvm/x86.c      |    1 +
 3 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index b65f5de..048849d 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -300,6 +300,7 @@ struct kvm_vm_stat {
 	u32 mmu_pde_zapped;
 	u32 mmu_flooded;
 	u32 mmu_recycled;
+	u32 remote_tlb_flush;
 };
 
 struct kvm {
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index d99396b..411b2bd 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -115,6 +115,9 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
 		if (cpu != -1 && cpu != raw_smp_processor_id())
 			cpu_set(cpu, cpus);
 	}
+	if (cpus_empty(cpus))
+		return;
+	++kvm->stat.remote_tlb_flush;
 	smp_call_function_mask(cpus, ack_flush, NULL, 1);
 }
 
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index b482b6a..ac09f38 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -73,6 +73,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	{ "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
 	{ "mmu_flooded", VM_STAT(mmu_flooded) },
 	{ "mmu_recycled", VM_STAT(mmu_recycled) },
+	{ "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 	{ NULL }
 };
 
-- 
1.5.3.7

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