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?
Minjun Hong On Mon, Dec 11, 2017 at 7:54 PM, George Dunlap <dunl...@umich.edu> wrote: > On Mon, Dec 11, 2017 at 5:59 AM, Minjun Hong <nickey...@gmail.com> wrote: > > Hello, I'm working on the 'credit scheduler' of Xen. > > And I need to compare CPU cache misses between original Xen and my > patching > > version. > > But I failed all attempt even if I have tried many methods by googling. > > When I typed 'perf list' with my 'perf' compiled by source code in the > > current kernel source code, it said: > > > >> nickeys@nickeys-linux-machine:~/ubuntu/tools/perf$ ./perf list > >> List of pre-defined events (to be used in -e): > >> msr/pperf/ [Kernel PMU event] > >> msr/smi/ [Kernel PMU event] > >> msr/tsc/ [Kernel PMU event] > >> power/energy-cores/ [Kernel PMU event] > >> power/energy-gpu/ [Kernel PMU event] > >> power/energy-pkg/ [Kernel PMU event] > >> power/energy-psys/ [Kernel PMU event] > >> power/energy-ram/ [Kernel PMU event] > >> rNNN [Raw hardware event > >> descriptor] > >> cpu/t1=v1[,t2=v2,t3 ...]/modifier [Raw hardware event > >> descriptor] > >> (see 'man perf-list' on how to encode it) > >> mem:<addr>[/len][:access] [Hardware > breakpoint] > >> nickeys@nickeys-linux-machine:~/ubuntu/tools/perf$ > > > > > > > > Since there is no HW event in contrast with native environment, I should > try > > 'Raw hardware event descriptor' option. > > According to 'Intel® 64 and IA-32 Architectures Software Developer’s > Manual > > Volume 3B: System Programming Guide', I used 'r412e' raw hardware event > to > > get LLC Misses which is in '18.2.1.2 Pre-defined Architectural > Performance > > Events' section of the guide, > > but I found out my 'perf' does not support the feature: > > > >> nickeys@nickeys-linux-machine:~/ubuntu/tools/perf$ sudo ./perf stat -e > >> r412e sleep 1 > >> Performance counter stats for 'sleep 1': > >> <not supported> r412e > >> 1.002120111 seconds time elapsed > >> nickeys@nickeys-linux-machine:~/ubuntu/tools/perf$ > > > > > > I could not understand why I cannot find out the number of cache-misses. > > When I did googling, I did not think there would be a problem because > there > > were a lot of posts to get cache-misses in the Xen environment. > > It sounds like what you might want is the vPMU functionality. CC'ing > Boris Ostrovsky, who has worked on vPMU functionality before. > > However, are you sure that you want to be reading cache misses from > the guest? It seems like that is *probably* OK, but another option > would be to instrument Xen to read and provide that information. > > -George >
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