linux-toradex.git/arch/powerpc/kvm/timing.h, branch v3.4.78

KVM: powerpc: Fix BUILD_BUG_ON condition

2009-12-03T07:32:22+00:00

The old BUILD_BUG_ON implementation didn't work with __builtin_constant_p().
Fixing that revealed this test had been inverted for a long time without
anybody noticing...

Signed-off-by: Hollis Blanchard 
Signed-off-by: Avi Kivity

powerpc/kvm: Remove problematic BUILD_BUG_ON statement

2009-11-05T06:10:34+00:00

Signed-off-by: Benjamin Herrenschmidt

KVM: ppc: mostly cosmetic updates to the exit timing accounting code

2008-12-31T14:55:41+00:00

The only significant changes were to kvmppc_exit_timing_write() and
kvmppc_exit_timing_show(), both of which were dramatically simplified.

Signed-off-by: Hollis Blanchard 
Signed-off-by: Avi Kivity

KVM: ppc: Implement in-kernel exit timing statistics

2008-12-31T14:55:41+00:00

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