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| author | Wei Huang | 2015-01-23 21:56:04 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2015-01-26 12:27:05 +0100 |
| commit | fc116efad0aadb2f8a49d51240bddbfe21b631a0 (patch) | |
| tree | b23457793d38d52d98f884ea96bc206a19fda762 /include | |
| parent | target-i386: Disable HLE and RTM on Haswell & Broadwell (diff) | |
| download | qemu-fc116efad0aadb2f8a49d51240bddbfe21b631a0.tar.gz qemu-fc116efad0aadb2f8a49d51240bddbfe21b631a0.tar.xz qemu-fc116efad0aadb2f8a49d51240bddbfe21b631a0.zip | |
kvm_stat: Add RESET support for perf event ioctl
While running kvm_stat using tracepoint on ARM64 hardware (e.g. "kvm_stat
-1 -t"), the initial values of some kvm_userspace_exit counters were found
to be very suspecious. For instance the tracing tool showed that S390_TSCH
was called many times on ARM64 machine, which apparently was wrong.
This patch adds RESET ioctl support for perf monitoring. Before calling
ioctl to enable a perf event, this patch resets the counter first. With
this patch, the init counter values become correct on ARM64 hardware.
Example:
==== before patch ====
kvm_userspace_exit(S390_SIEIC) 1426 0
kvm_userspace_exit(S390_TSCH) 339 0
==== after patch ====
kvm_userspace_exit(S390_SIEIC) 0 0
kvm_userspace_exit(S390_TSCH) 0 0
Signed-off-by: Wei Huang <wei@redhat.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions