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Subject[RFC][PATCH] KVM: perf: a smart tool to analyse kvm events
This tool is very like xenoprof(if i remember correctly), and traces kvm events
smartly. currently, it supports vmexit/mmio/ioport events.

Usage:
- to trace kvm events:
# ./perf kvm-events record

- show the result
# ./perf kvm-events report

Some output are as follow:
# ./perf kvm-events report
Warning: Error: expected type 5 but read 4
Warning: Error: expected type 5 but read 0
Warning: unknown op '}'

Analyze events for all VCPUs:

VM-EXIT Samples Samples% Time% Avg time

APIC_ACCESS 438107 44.89% 6.20% 17.91us
EXTERNAL_INTERRUPT 219226 22.46% 8.01% 46.20us
IO_INSTRUCTION 122651 12.57% 1.88% 19.44us
EPT_VIOLATION 83110 8.52% 1.36% 20.75us
PENDING_INTERRUPT 37055 3.80% 0.16% 5.38us
CPUID 32718 3.35% 0.08% 3.15us
EXCEPTION_NMI 23601 2.42% 0.17% 8.87us
HLT 15424 1.58% 82.12% 6735.06us
CR_ACCESS 4089 0.42% 0.02% 6.08us

Total Samples:975981, Total events handled time:126502464.88us.

The default event to be analysed is vmexit, we can use --event to specify it,
for example, if we want to trace mmio event:
# ./perf kvm-events report --event mmio
Warning: Error: expected type 5 but read 4
Warning: Error: expected type 5 but read 0
Warning: unknown op '}'

Analyze events for all VCPUs:

MMIO Access Samples Samples% Time% Avg time

0xfee00380:W 196589 64.95% 70.01% 3.83us
0xfee00310:W 35356 11.68% 6.48% 1.97us
0xfee00300:W 35356 11.68% 16.37% 4.97us
0xfee00300:R 35356 11.68% 7.14% 2.17us

Total Samples:302657, Total events handled time:1074746.01us.

We can use --vcpu to specify which vcpu is traced:
root@localhost perf]# ./perf kvm-events report --event mmio --vcpu 1
Warning: Error: expected type 5 but read 4
Warning: Error: expected type 5 but read 0
Warning: unknown op '}'

Analyze events for VCPU 1:

MMIO Access Samples Samples% Time% Avg time

0xfee00380:W 58041 71.20% 74.90% 3.70us
0xfee00310:W 7826 9.60% 5.28% 1.93us
0xfee00300:W 7826 9.60% 13.82% 5.06us
0xfee00300:R 7826 9.60% 6.01% 2.20us

Total Samples:81519, Total events handled time:286577.81us.

And, '--key' is used to sort the result, the possible value sample (default,
the result is sorted by samples number), time(the result is sorted by time%):
# ./perf kvm-events report --key time
Warning: Error: expected type 5 but read 4
Warning: Error: expected type 5 but read 0
Warning: unknown op '}'

Analyze events for all VCPUs:

VM-EXIT Samples Samples% Time% Avg time

HLT 15424 1.58% 82.12% 6735.06us
EXTERNAL_INTERRUPT 219226 22.46% 8.01% 46.20us
APIC_ACCESS 438107 44.89% 6.20% 17.91us
IO_INSTRUCTION 122651 12.57% 1.88% 19.44us
EPT_VIOLATION 83110 8.52% 1.36% 20.75us
EXCEPTION_NMI 23601 2.42% 0.17% 8.87us
PENDING_INTERRUPT 37055 3.80% 0.16% 5.38us
CPUID 32718 3.35% 0.08% 3.15us
CR_ACCESS 4089 0.42% 0.02% 6.08us

Total Samples:975981, Total events handled time:126502464.88us.

I hope guys will like it and any comments are welcome! :)



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