From 73e75b416ffcfa3a84952d8e389a0eca080f00e1 Mon Sep 17 00:00:00 2001 From: Hollis Blanchard Date: Tue, 2 Dec 2008 15:51:57 -0600 Subject: KVM: ppc: Implement in-kernel exit timing statistics Existing KVM statistics are either just counters (kvm_stat) reported for KVM generally or trace based aproaches like kvm_trace. For KVM on powerpc we had the need to track the timings of the different exit types. While this could be achieved parsing data created with a kvm_trace extension this adds too much overhead (at least on embedded PowerPC) slowing down the workloads we wanted to measure. Therefore this patch adds a in-kernel exit timing statistic to the powerpc kvm code. These statistic is available per vm&vcpu under the kvm debugfs directory. As this statistic is low, but still some overhead it can be enabled via a .config entry and should be off by default. Since this patch touched all powerpc kvm_stat code anyway this code is now merged and simplified together with the exit timing statistic code (still working with exit timing disabled in .config). Signed-off-by: Christian Ehrhardt Signed-off-by: Hollis Blanchard Signed-off-by: Avi Kivity --- arch/powerpc/kernel/asm-offsets.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'arch/powerpc/kernel') diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index ba39526d3201..9937fe44555f 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -383,5 +383,16 @@ int main(void) DEFINE(PTE_T_LOG2, PTE_T_LOG2); #endif +#ifdef CONFIG_KVM_EXIT_TIMING + DEFINE(VCPU_TIMING_EXIT_TBU, offsetof(struct kvm_vcpu, + arch.timing_exit.tv32.tbu)); + DEFINE(VCPU_TIMING_EXIT_TBL, offsetof(struct kvm_vcpu, + arch.timing_exit.tv32.tbl)); + DEFINE(VCPU_TIMING_LAST_ENTER_TBU, offsetof(struct kvm_vcpu, + arch.timing_last_enter.tv32.tbu)); + DEFINE(VCPU_TIMING_LAST_ENTER_TBL, offsetof(struct kvm_vcpu, + arch.timing_last_enter.tv32.tbl)); +#endif + return 0; } -- cgit v1.2.3