diff options
| author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-12-02 15:51:57 -0600 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-12-31 16:55:41 +0200 |
| commit | 73e75b416ffcfa3a84952d8e389a0eca080f00e1 (patch) | |
| tree | 6195be5b0fa56235550679f35ca990093dd081ca /arch/powerpc/kernel | |
| parent | c5fbdffbda79254047ec83b09c1a61a3655d052a (diff) | |
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 <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 11 |
1 files changed, 11 insertions, 0 deletions
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; } |