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RE: [Xen-devel] Understanding capabilites of xenoprof
- To: "shobha ranganathan" <shobha_ranganathan@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
- 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
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
- Thread-index: AcardA4eWipXTgCCRDace/OvrhgS6wAOXkJQ
- Thread-topic: [Xen-devel] Understanding capabilites of xenoprof
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
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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