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/kvm/emulate.c | |
| 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/kvm/emulate.c')
| -rw-r--r-- | arch/powerpc/kvm/emulate.c | 4 |
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; |