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RE: [Xen-devel] Understanding capabilites of xenoprof

To: "shobha ranganathan" <shobha_ranganathan@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Understanding capabilites of xenoprof
From: "Santos, Jose Renato G" <joserenato.santos@xxxxxx>
Date: Wed, 19 Jul 2006 20:42:28 -0700
Delivery-date: Wed, 19 Jul 2006 20:43:32 -0700
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Thread-topic: [Xen-devel] Understanding capabilites of xenoprof
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

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.

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