[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] some questions about Xenoprof
On Sun, Jan 4, 2009 at 7:32 PM, weiming <zephyr.zhao@xxxxxxxxx> wrote: > Hi, > > I want to use Xenoprof to monitors some system-wide events (like L2 misses > etc). > > 1. I'm using Xen 3.3. I guess I don't need to patch it as I find that a > hypercall and some source codes related to xenoprof are already there. So I > just downloaded the patch against oprofile. After that, when I run opcontrol > --help, I found that "--xen" was listed as an option. So I think my > installation should be OK. > > 2. I will run some workloads on domU. What I want to monitor is the > system-wide event counts like L2_LINES_IN. What should I do? Is running > "opcontrol --start --no-vmlinux --event=XXXX:YYYY:ZZZZ" on dom0 enough? Need > I specify "--passive-domains" or "--active-domains" ? > > 3. I'm running the system on a muliti-core machine. Can Xenoprof list the > event counters per core? Not per physical core. However, from what I understand, xenoprof can list the event counters per VCPU if you use the --separate=cpu option. So, you could pin the VCPUs to cores if that is what you really want. Second, the current version of xenoprof has a bug that prevents it from correctly collecting per-VCPU info. Renato (cc-ed) should have a patch to fix this though. Cheers, Niraj -- Niraj Tolia, Researcher, HP Labs http://www.hpl.hp.com/personal/Niraj_Tolia/ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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