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

[Naresh Rapolu <nrapolu@xxxxxxxxxx>]

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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