xentrace 사용법

1. xentrace

- Xentrace is used to capture trace buffer data from xen

2. Usage

- xentrace [OPTIONS] [FILE]

- xentrace -D -e all -S 256 -T 30 {filename}

- 예: xentrace -D -e all -S 256 -T 1 trace.raw

3. output (binary format)

- CPU(uint) TSC(u64) EVENT(u32) D1 D2 D3 D4 D5 (all u32)

- CPU is the processor number,

- TSC is the record's timestamp (the value of the CPU cycle counter)

- EVENT is the event ID 

- D1 through D5 are the trace data.

3. text file format 변경

- 예: cat trace.raw | xentrace_format ./formats > trace.txt

- formats 파일?

- A sample format file for Xen's predefined trace events is available in xen source

- xen source/tools/xentrace/formats

4. trace 예

CPU0  931534214445874 (+    1844)  hypercall  [ eip = 0xc1002227, eax = 0x00000011 ]
CPU0  931534214449368 (+    3494)  hypercall  [ eip = 0xc1002227, eax = 0x00000011 ]
CPU0  931534214452582 (+    3214)  hypercall  [ eip = 0xc10023a7, eax = 0x0000001d ]
CPU0  931534214453252 (+     670)  do_block          [ domid = 0x00000000, edomid = 0x00000005 ]
CPU0  931534214456210 (+    2958)  switch_infprev    [ old_domid = 0x00000000, runtime = 16692 ]
CPU0  931534214456696 (+     486)  switch_infnext    [ new_domid = 0x00007fff, time = 16692, r_time = 4294967295 ]
CPU0  931534214457162 (+     466)  __enter_scheduler [ prev<domid:edomid> = 0x00000000 : 0x00000005, next<domid:edomid> = 0x00007fff : 0x00000000 ]
CPU0  931534214457682 (+     520)  running_to_blocked  [ dom:vcpu = 0x00000005 ]
CPU0  931534214458200 (+     518)  runnable_to_running [ dom:vcpu = 0x7fff0000 ]
CPU0  931534227964190 (+13505990)  blocked_to_runnable [ dom:vcpu = 0x00000005 ]