Re: [Xen-devel] [PATCH 0 of 5] Add credit2 scheduler (EXPERIMENTAL)

[Dulloor <dulloor@xxxxxxxxx>]

Naresh,

If you are interested only in profiling, you could use xenoprof too.
I had ported xenoprof to pvops (attaching a patch that applies cleanly
to linux pvops). I have used this with passive profiling and for
profiling xen/dom0. This patch also includes an obvious fix (over
oprofile branch in Jeremy's repo) for active profiling, although I
didn't get a chance to test.

Please let know if you try this and if you face any issues.

thanks
dulloor

On Thu, Apr 15, 2010 at 12:46 PM, Naresh Rapolu <nrapolu@xxxxxxxxxx> wrote:
> Hello George,
>
> I am trying to get linux "perf" tool work with Xen(Virtualize PMU to measure
> hardware events from inside guests).
> I have the following options :
>
>  1. allowing the guest kernel to see the PMU hardware features via
>     cpuid, and then doing whatever is necessary to make them work as
>     expected (by instruction emulation, etc), or
>  2. keeping them hidden, but adding a new Xen interface and the
>     appropriate Linux-side code to detect that interface and use it
>
>
> Does Xenalyze have any code relevant to this ? Can you think of any
> directions in this regard ?
>
> Thanks,
> Naresh Rapolu.
>
>
> George Dunlap wrote:
>>
>> I have not measured cache / TLB misses with this workload yet.  In the
>> past I've instrumented the scheduler trace records in Xen to include
>> performance counters such as instructions executed and cache / tlb misses,
>> and then used xenalyze (http://xenbits.xensource.com/ext/xenalyze.hg) to
>> analyze them.  But the functionality for both capture and analysis was never
>> standardized or added to mainline.
>>
>> I'd be happy to help point you in the right direction if you're interested
>> in investing in that approach. :-)
>>
>> -George
>>
>> Naresh Rapolu wrote:
>>>
>>> Hello George,
>>>
>>> How did you measure  Cache/ TLB misses etc while using/profiling this new
>>> scheduler ?  Any tool that you`ve used which works with Xen ?
>>>
>>> Thanks,
>>> Naresh Rapolu.
>>> PhD Student, Computer Science,
>>> Purdue University.
>>>
>>> George Dunlap wrote:
>>>
>>>>
>>>> This patch series introduces the credit2 scheduler.  The first two
>>>> patches
>>>> introduce changes necessary to allow the credit2 shared runqueue
>>>> functionality
>>>> to work properly; the last two implement the functionality itself.
>>>>
>>>> The scheduler is still in the experimental phase.  There's lots of
>>>> opportunity to contribute with independent lines of development; email
>>>> George Dunlap <george.dunlap@xxxxxxxxxxxxx> or check out the wiki page
>>>> http://wiki.xensource.com/xenwiki/Credit2_Scheduler_Development for
>>>> ideas
>>>> and status updates.
>>>>
>>>> 19 files changed, 1453 insertions(+), 21 deletions(-)
>>>> tools/libxc/Makefile                      |    1
>>>> tools/libxc/xc_csched2.c                  |   50 +
>>>> tools/libxc/xenctrl.h                     |    8
>>>> tools/python/xen/lowlevel/xc/xc.c         |   58 +
>>>> tools/python/xen/xend/XendAPI.py          |    3
>>>> tools/python/xen/xend/XendDomain.py       |   54 +
>>>> tools/python/xen/xend/XendDomainInfo.py   |    4
>>>> tools/python/xen/xend/XendNode.py         |    4
>>>> tools/python/xen/xend/XendVMMetrics.py    |    1
>>>> tools/python/xen/xend/server/SrvDomain.py |   14 
>>>> tools/python/xen/xm/main.py
>>>>               |   82 ++
>>>> xen/arch/ia64/vmx/vmmu.c                  |    6 xen/common/Makefile
>>>>                   |    1 xen/common/sched_credit.c                 |    8
>>>> xen/common/sched_credit2.c                | 1125
>>>> +++++++++++++++++++++++++++++
>>>> xen/common/schedule.c                     |   22
>>>> xen/include/public/domctl.h               |    4 xen/include/public/trace.h
>>>>                |    1 xen/include/xen/sched-if.h                |   28
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-devel
>>>>
>>>
>>>
>>
>
>
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