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 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
