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authorHollis Blanchard <hollisb@us.ibm.com>2008-12-02 15:51:57 -0600
committerAvi Kivity <avi@redhat.com>2008-12-31 16:55:41 +0200
commit73e75b416ffcfa3a84952d8e389a0eca080f00e1 (patch)
tree6195be5b0fa56235550679f35ca990093dd081ca /arch/powerpc/kvm/emulate.c
parentc5fbdffbda79254047ec83b09c1a61a3655d052a (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/kvm/emulate.c')
-rw-r--r--arch/powerpc/kvm/emulate.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 4c30fa0c31ea..d1d38daa93fb 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -28,6 +28,7 @@
#include <asm/byteorder.h>
#include <asm/kvm_ppc.h>
#include <asm/disassemble.h>
+#include "timing.h"
void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
@@ -73,6 +74,9 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
enum emulation_result emulated = EMULATE_DONE;
int advance = 1;
+ /* this default type might be overwritten by subcategories */
+ kvmppc_set_exit_type(vcpu, EMULATED_INST_EXITS);
+
switch (get_op(inst)) {
case 3: /* trap */
vcpu->arch.esr |= ESR_PTR;