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Re: [Xen-devel] profiling active RHEL 4 PV domains with xenoprof
| To: | George Dunlap <George.Dunlap@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] profiling active RHEL 4 PV domains with xenoprof |
| From: | Andrew Evans <andrewe@xxxxxxxxxxxxx> |
| Date: | Fri, 29 Jan 2010 13:11:44 -0800 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 29 Jan 2010 13:12:17 -0800 |
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On 01/29/10 04:41, George Dunlap wrote: > Re the PV kernels: are you sure that the PV kernel has support for Xen > profiling? PV xenoprofile makes hypercalls to Xen to set up the > performance event counters. But if that isn't set up properly, or for > some other reason doesn't work right, the guest oprofile may default > back to using only timers, for which it doesn't need Xen's help (but > which are less accurate especially in a virtual environment). > I'm pretty sure RHEL 4's 2.6.9 kernel doesn't have the xenoprof patches, but I haven't looked yet. I'm going to try the 2.6.18 xenU kernel I built from the xen-unstable tree and see how that goes. thanks, -Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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