[Xen-devel] RE: Xenoprof in an HVM domain

["Santos, Jose Renato G" <joserenato.santos@xxxxxx>]

 Great, Xiaowei!
  This is good news.
  I look forward for your patches

  Thanks

Renato

>> -----Original Message-----
>> From: Yang, Xiaowei [mailto:xiaowei.yang@xxxxxxxxx] 
>> Sent: Wednesday, April 26, 2006 4:15 AM
>> To: Santos, Jose Renato G; xen-devel@xxxxxxxxxxxxxxxxxxx
>> Subject: RE: Xenoprof in an HVM domain
>> 
>> >
>> >  No, support for passive domain is not available yet.
>> >  Xiaowei, is working on getting passive domain support with  the 
>> > capability of decoding Xen and kernel samples into  function names 
>> > (but not for user level samples).
>> >  Xiaowei, could provide more details of when he expects 
>> this  to be 
>> > available for others to use
>> >
>> 
>> Hi Renato,
>> For now passive domain is enabled and I've used it and my 
>> enhancement to oprofile to profile VMX doamin.
>> 
>> This is the example of how to use it: 
>> opcontrol --start-daemon --passive-domains=2 
>> --event=GLOBAL_POWER_EVENTS:10000000:1:1:1 
>> --vmlinux=/boot/vmlinux-syms-2.6.16-xen0 
>> --xen=/boot/xen-syms-3.0-unstable 
>> --passive-images=/boot/vmlinux-2.6.9
>> 
>> 2 more options are added:
>> --passive-domains is to point out a list of passive domain IDs.
>> --passive-images is for mapping samples to passive domain 
>> kernel functions.
>> 
>> Let me show you what it can do. Below is a result example 
>> collected in dom0 while vmx is running sysbench --test=thread:
>> #opreport
>>   samples|      %|
>> ------------------
>>      1322 62.6837 pvmlinux2-syms
>>       698 33.0963 papps2-syms
>>        54  2.5605 pxen2-syms
>>        18  0.8535 vmlinux-syms-2.6.16-xen0
>>         8  0.3793 libc-2.3.4.so
>>         7  0.3319 xen-syms-3.0-unstable
>>         1  0.0474 bash
>>         1  0.0474 oprofiled
>> 
>> Here 3 entries need more notice:
>> - pvmlinux?-syms entry means samples for passive domain 
>> kernel, while ? stand for domain_id (it's 2 here);
>> - papps?-syms entry means samples of passive domain application.
>> - pxen?-syms entry means samples of xen when current points 
>> to passive domain ?
>> 
>> This is the function level mapping, which clearly reflects 
>> what vmx domain is doing:
>> #opreport -l
>> samples  %        app name                 symbol name
>> 698      33.0963  papps2-syms              (no symbols)
>> 399      18.9189  pvmlinux2-syms           sched_clock
>> 330      15.6472  pvmlinux2-syms           sysenter_past_esp
>> 263      12.4704  pvmlinux2-syms           schedule
>> 131       6.2115  pvmlinux2-syms           sysenter_entry
>> 58        2.7501  pvmlinux2-syms           enqueue_task
>> 56        2.6553  pvmlinux2-syms           dequeue_task
>> 49        2.3234  pvmlinux2-syms           sys_sched_yield
>> 16        0.7587  pvmlinux2-syms           this_rq_lock
>> 11        0.5216  pxen2-syms               vmx_asm_vmexit_handler
>> 10        0.4742  pvmlinux2-syms           mark_offset_tsc
>> 6         0.2845  pvmlinux2-syms           mask_and_ack_8259A
>> 5         0.2371  pxen2-syms               vmx_vmexit_handler
>> 4         0.1897  pxen2-syms               __vmwrite
>> 3         0.1422  pxen2-syms               hvm_io_assist
>> 3         0.1422  pxen2-syms               vmx_intr_assist
>> 3         0.1422  pxen2-syms               vmx_io_instruction
>> ...
>> 
>> So it's mainly usable, but there is still an issue doing 
>> resource cleanup. After it's fixed, I'll send the patch out.
>> 
>> Thanks,
>> -xiaowei
>> 

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