RE: [Xen-devel] Understanding capabilites of xenoprof

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

Shobha,

 

XenOprofile does not save/restore performance counter state on context switches.

Currently, Xenoprofile uses peformance counters for global system-wide profiling, i.e no performance counter virtualization are provided to guests today.

Support for performance counter virtualization would be nice, but as far as I know nobody is actively working on this

Renato 

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From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of shobha ranganathan
Sent: Wednesday, July 19, 2006 1:41 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Understanding capabilites of xenoprof

I wanted to understand how xenoprof handles (if at all) saving of PMC/PMDs (data related to PMU) during a context switch.

 

I am looking at xenoprof.c and other files in oprofile code in xen-unstable/xen/...

 

I would like to know how it interacts with hypervisor..

 

Please let me know which files I should look at to understand hypervisor interactions.

 

Thanks

Shobha

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