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| author | Alexander Yarygin <[email protected]> | 2014-04-09 14:21:59 +0000 |
|---|---|---|
| committer | Jiri Olsa <[email protected]> | 2014-04-19 22:14:08 +0000 |
| commit | acb61fc8ed73eb477a9044272d7a1b1f5a572f91 (patch) | |
| tree | 25b35446f6c7aaf8285012fc782d9f5d3eb6f934 /tools/perf/scripts/python/event_analyzing_sample.py | |
| parent | perf/x86/intel: Use rdmsrl_safe() when initializing RAPL PMU (diff) | |
| download | kernel-acb61fc8ed73eb477a9044272d7a1b1f5a572f91.tar.gz kernel-acb61fc8ed73eb477a9044272d7a1b1f5a572f91.zip | |
perf kvm: Fix 'Min time' counting in report command
Every event in the perf-kvm has a 'stats' structure, which contains
max/min/average/etc times of handling this event.
The problem is that the 'perf-kvm stat report' command always shows
that 'min time' is 0us for every event. Example:
# perf kvm stat report
Analyze events for all VCPUs:
VM-EXIT Samples Samples% Time% Min Time Max Time Avg time
[..]
0xB2 MSCH 12 0.07% 0.00% 0us 8us 7.31us ( +- 2.11% )
0xB2 CHSC 12 0.07% 0.00% 0us 18us 9.39us ( +- 9.49% )
0xB2 STPX 8 0.05% 0.00% 0us 2us 1.88us ( +- 7.18% )
0xB2 STSI 7 0.04% 0.00% 0us 44us 16.49us ( +- 38.20% )
[..]
This happens because the 'stats' structure is not initialized and
stats->min equals to 0. Lets initialize the structure for every
event after its allocation using init_stats() function. This initializes
stats->min to -1 and makes 'Min time' statistics counting work:
# perf kvm stat report
Analyze events for all VCPUs:
VM-EXIT Samples Samples% Time% Min Time Max Time Avg time
[..]
0xB2 MSCH 12 0.07% 0.00% 6us 8us 7.31us ( +- 2.11% )
0xB2 CHSC 12 0.07% 0.00% 7us 18us 9.39us ( +- 9.49% )
0xB2 STPX 8 0.05% 0.00% 1us 2us 1.88us ( +- 7.18% )
0xB2 STSI 7 0.04% 0.00% 1us 44us 16.49us ( +- 38.20% )
[..]
Signed-off-by: Alexander Yarygin <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>
Reviewed-by: David Ahern <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Fixing the perf examples changelog output ]
Signed-off-by: Jiri Olsa <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/event_analyzing_sample.py')
0 files changed, 0 insertions, 0 deletions