diff options
author | Hollis Blanchard <hollisb@us.ibm.com> | 2008-12-02 15:51:57 -0600 |
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committer | Avi Kivity <avi@redhat.com> | 2008-12-31 16:55:41 +0200 |
commit | 73e75b416ffcfa3a84952d8e389a0eca080f00e1 (patch) | |
tree | 6195be5b0fa56235550679f35ca990093dd081ca /arch/powerpc/kvm/booke.h | |
parent | c5fbdffbda79254047ec83b09c1a61a3655d052a (diff) | |
download | linux-73e75b416ffcfa3a84952d8e389a0eca080f00e1.tar.bz2 |
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/booke.h')
-rw-r--r-- | arch/powerpc/kvm/booke.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/booke.h b/arch/powerpc/kvm/booke.h index 48d905fd60ab..cf7c94ca24bf 100644 --- a/arch/powerpc/kvm/booke.h +++ b/arch/powerpc/kvm/booke.h @@ -22,6 +22,7 @@ #include <linux/types.h> #include <linux/kvm_host.h> +#include "timing.h" /* interrupt priortity ordering */ #define BOOKE_IRQPRIO_DATA_STORAGE 0 @@ -50,8 +51,10 @@ static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr) vcpu->arch.msr = new_msr; - if (vcpu->arch.msr & MSR_WE) + if (vcpu->arch.msr & MSR_WE) { kvm_vcpu_block(vcpu); + kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS); + }; } #endif /* __KVM_BOOKE_H__ */ |