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xen-devel
RE: [Xen-devel] xenoprofile and multiplexing of events (AMD patch)
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Muhammad
You can take a look at xenoprof code. The generic
part is on xen/common/xenoprof.c and the x86 specific part is on
arch/x86/oprofile. The arch specific part has the actual code that access the
perf counters and the generic part implements the hypercall interface to the
kernel.
Renato
Thanks
for the info. Unfortunatly I am one of the people who desperately want
to have multiplexing of hardware events in Xen. We are working on HPC
applications on Xen so lack of patches like perfctl/perfmon is quite
annoying. :) I will read the xenoprofile paper and related documents
before asking more questions on implementing such a facility. But one quick
question (may be a naive one) is where to look into the code if I want to give
hardware performance counters to only dom0. I don't want fancy stuff (like per
process/function etc)... just purely read the counter values of each of the
CPU.
Best Regards, Muhammad Atif
-----
Original Message ---- From: "Santos, Jose Renato G"
<joserenato.santos@xxxxxx> To: "Santos, Jose Renato G"
<joserenato.santos@xxxxxx>; Muhammad Atif <m_atif_s@xxxxxxxxx>;
Viren Kumar <virenk@xxxxxxx>; "xen-devel@xxxxxxxxxxxxxxxxxxx"
<xen-devel@xxxxxxxxxxxxxxxxxxx> Sent: Tuesday, June 17, 2008 1:25:58
PM Subject: RE: [Xen-devel] xenoprofile and multiplexing of events (AMD
patch)
Muhammad,
Thanks for sharing the patch. The patch seems to
reprogram event counters in regular intervals to profile different events
with the same counters. Unfortunately this will not work on Xen unless
someone writes a patch. Not sure if it is worth the effort though. I
am not sure how frequently people want to profile more events than available,
although I can see it could be useful in a few cases.
Renato
Muhammad,
I am not familiar with this AMD patch. Is this a linux
kernel patch? If you can provide more details of what the patch does,
perhaps I can comment on the implications of its use with
Xen.
Regards
Renato
Hi
developers! especially xenoprofile gurus Jason Yeh of AMD has just
released a patch for multiplexing hardware events in oprofile for
AMDs. Has anybody looked into that with Xen's perspective? Is it
trivial to be hooked on to our xen kernels? Second question, is there
any way we can get access of hardware performance counters even in a very
raw form i.e. only available to dom0 (even if it is still a specialized
domu). Best Regards, Muhammad Atif
-----
Original Message ---- From: Muhammad Atif
<m_atif_s@xxxxxxxxx> To: Viren Kumar <virenk@xxxxxxx>;
xen-devel@xxxxxxxxxxxxxxxxxxx Sent: Thursday, June 12, 2008 11:34:52
PM Subject: Re: [Xen-devel] Status of hardware performance counters in
Xen
AFAIK
nope. I am also looking for a nice way to get hold of performance
counters in Xen, but seems like its not making on to top of priority
queue, perhaps one of us should try it or we can collaborate. :) So,
still the way to go is oprofile (xenoprofile).
Best Regards, Muhammad Atif
----- Original Message ---- From: Viren Kumar
<virenk@xxxxxxx> To: xen-devel@xxxxxxxxxxxxxxxxxxx Sent:
Wednesday, June 11, 2008 9:41:42 AM Subject: [Xen-devel] Status of
hardware performance counters in Xen Hello everyone, I'm
wondering what the current status of hardware performance counter
usability in Xen is. I see some old posts describing the diffculties
of virtualizing hardware counters within dom0 and the domUs, but not
much else. Have they been implemented or are they in the process of
being implemented? Or are there no future plans for implementation?
Any help would be appreciated. My platform would be Xen with
Solaris x86 as the dom0 (xVM) and Solaris or Linux as the
domUs. Thanks, Viren _______________________________________________ Xen-devel
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