On Tue, Dec 12, 2017 at 12:30 AM, George Dunlap <dunl...@umich.edu> wrote:
> On Mon, Dec 11, 2017 at 3:05 PM, Boris Ostrovsky > <boris.ostrov...@oracle.com> wrote: > > On 12/11/2017 09:36 AM, Meng Xu wrote: > >> On Mon, Dec 11, 2017 at 8:14 AM, Minjun Hong <nickey...@gmail.com> > wrote: > >>> Thanks for your answer, George. > >>> > >>> What I want ultimately is cache misses from the guest, but even I > could not get the cache misses from dom0 also. > >>> That's why I'm confused as I know, it should be possible to get > cache-misses from dom0 (is it right??). > >>> I already enabled CONFIG_XEN_HAVE_VPMU of current kernel to get cache > misses. Is there anything what I miss during Xen install? > >>> > >> If this is for a research project, I would suggest you to write your > >> own code to monitor the cache misses for domU. This could be faster, > >> since it's not complicated to do so. > >> > >> IIRC, PMU in Xen can only monitor the cache misses when VCPUs are > >> pinned to cores. > > > > Counters are virtualized for guests (including dom0) so I am not sure > > pinning is required. Pinning is only needed when you try to collect > > counters for full system. > > > > OTOH, when a VCPU is migrated you start running with a new cache, > > something to keep in mind. > > Well if his goal was to measure cache misses based on different Xen > scheduling algorithms, that might be the point. :-) > > Minjun: BTW, it's standard on this list to quote inline (as I'm > doing), rather than top-posting (having your reply at the top and the > original mail entirely beneath it). > > Thanks, > -George > Thanks to your help, finally, I resolve the problem. I could have access to VPMU and I successfully estimated performance of my work. And, I'm sorry for violation of standard for this list. I will pay attention to this point in the future. I'd like to appreciate your help again. Minjun Hong
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