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xen-devel
Re: [Xen-devel] Performance Counter Virtualization in Xen
Well it's not "x86 architectures", but the current profiling support in
xen on powerpc allows the use of performance counters from the domains
as used from non-virtualized environments.
It is currently only tested with oprofile and has to be considered
experimental because there are some known issues, but depending on your
needs this might work for you.
As far as I read on
http://icl.cs.utk.edu/papi/custom/index.html?lid=62&slid=96 PAPI has
PPC970 support.
I do not know PAPI in detail, but it is possible that you can run it
with less/no patching xen/linux on the current xenppc head.
Santos, Jose Renato G wrote:
You are right, currently the only available tool for using hardware
performance counters in Xen is XenOprofile. To expose a more generic
API to guests such as Perfmon, we would need to virtualize performance
counters. One of the challenges of virtualizing performance counters
is the high cost of saving and restoring perf. counters on domain
context switches. It may be possible to do some optimizations such as
lazy save/restore that could help. Also it is expected that the cost
for accessing performance counters is going to be better in new
processors that are coming out from Intel and AMD. afaik, no one is
actively working on virtualizing HW performance counters in Xen.
For other software metrics such as number of I/O operations you can
try Xenmon which report values of Xen performance counters (i.e SW
counters).
Regards
Renato
------------------------------------------------------------------------
*From:* xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] *On Behalf Of
*Bhatia, Nikhil
*Sent:* Friday, May 18, 2007 12:15 PM
*To:* xen-users@xxxxxxxxxxxxxxxxxxx
*Cc:* xen-devel@xxxxxxxxxxxxxxxxxxx
*Subject:* [Xen-devel] Performance Counter Virtualization in Xen
Hello Xenthusiasts,
I have a few questions regarding the performance monitoring of
applications and domains running on the latest version of Xen VMM
via the performance monitoring counters available in x86
architectures.
- I have used Xenoprof by patching Xen-3.0.2 Xenolinux
and the Oprofile layer which enabled me to collect performance
counter values per domain (for a passive domain) and per
application (for an active domain). I was able to perform the
profiling via command line interface using Opcontrol and then
reporting the counters using Opreport. However, I was unable to
find a way to profile an application (using an API like PAPI)
because the perfctr port was not available for Xen. Is there a way
through which applications can be monitored using performance
counters?
- Is there a Xen tool/utility which provides meaningful
information about per-domain metrics for dynamic memory usage
(e.g. reserved memory by Xen, total heap size in use, swap space
reserved per domain etc.), I/O done to/from the disc and the bytes
sent/received from the network over fixed intervals of time?
Thanks,
Best Regards,
Nikhil
------------------------------------------------------------------------
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--
Grüsse / regards,
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization
+49 7031/16-3385
Ehrhardt@xxxxxxxxxxxxxxxxxxx
Ehrhardt@xxxxxxxxxx
IBM Deutschland Entwicklung GmbH
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Geschäftsführung: Herbert Kircher
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