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kvm_service_time.stp - Time Statistics on KVM Exit Reasons
The kvm_service_time.stp script tracks the statistics about the
amount of time that the processor left the guest virtual machine for
each exit reason (for example fixing up a page table or handling an
IO operation). When the script exits it prints out the number of
times each exit reason was encountered, the total duration of time it
left the guest VM, the minimum time, the average time, and the
maximum time in microseconds for that exit reason. On Linux 2.6.38
and newer kernel the script can automatically determine whether it is
running on Intel or AMD processors. For older kernels with a
kernel.trace("kvm_exit") tracepoint that does not have the $isa
parameter you can explicitly state the kvm type with a "-G kvm=intel"
or "-G kvm=amd" on the command line.
# stap kvm_service_time.stp -T 1
$ stap kvm_service_time.stp -T 10
# Intel exit reasons are EXIT_REASON_* in linux/arch/x86/include/asm/vmx.h
# reason: count sum(us) min(us) avg(us) max(us)
0: 55 123 0 2 12
1: 16668 23165 0 1 77
7: 65 129 0 1 21
12: 182 29145513 58 160140 500054
28: 1 2 2 2 2
30: 1561 5126 0 3 43
32: 10728 7748 0 0 32
40: 4966918 1273170 0 0 47
49: 105 201 0 1 22
Below are the EXIT_REASON_* codes corresponding to the output from the result
#define EXIT_REASON_EXCEPTION_NMI 0
#define EXIT_REASON_EXTERNAL_INTERRUPT 1
#define EXIT_REASON_TRIPLE_FAULT 2
#define EXIT_REASON_PENDING_INTERRUPT 7
#define EXIT_REASON_NMI_WINDOW 8
#define EXIT_REASON_TASK_SWITCH 9
#define EXIT_REASON_CPUID 10
#define EXIT_REASON_HLT 12
#define EXIT_REASON_INVD 13
#define EXIT_REASON_INVLPG 14
#define EXIT_REASON_RDPMC 15
#define EXIT_REASON_RDTSC 16
#define EXIT_REASON_VMCALL 18
#define EXIT_REASON_VMCLEAR 19
#define EXIT_REASON_VMLAUNCH 20
#define EXIT_REASON_VMPTRLD 21
#define EXIT_REASON_VMPTRST 22
#define EXIT_REASON_VMREAD 23
#define EXIT_REASON_VMRESUME 24
#define EXIT_REASON_VMWRITE 25
#define EXIT_REASON_VMOFF 26
#define EXIT_REASON_VMON 27
#define EXIT_REASON_CR_ACCESS 28
#define EXIT_REASON_DR_ACCESS 29
#define EXIT_REASON_IO_INSTRUCTION 30
#define EXIT_REASON_MSR_READ 31
#define EXIT_REASON_MSR_WRITE 32
#define EXIT_REASON_INVALID_STATE 33
#define EXIT_REASON_MWAIT_INSTRUCTION 36
#define EXIT_REASON_MONITOR_INSTRUCTION 39
#define EXIT_REASON_PAUSE_INSTRUCTION 40
#define EXIT_REASON_MCE_DURING_VMENTRY 41
#define EXIT_REASON_TPR_BELOW_THRESHOLD 43
#define EXIT_REASON_APIC_ACCESS 44
#define EXIT_REASON_EOI_INDUCED 45
#define EXIT_REASON_EPT_VIOLATION 48
#define EXIT_REASON_EPT_MISCONFIG 49
#define EXIT_REASON_INVEPT 50
#define EXIT_REASON_PREEMPTION_TIMER 52
#define EXIT_REASON_INVVPID 53
#define EXIT_REASON_WBINVD 54
#define EXIT_REASON_XSETBV 55
#define EXIT_REASON_APIC_WRITE 56
#define EXIT_REASON_INVPCID 58