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. Below is my PC configuration: CPU: Intel Core i7-6700 > OS: Ubuntu 16.04 LTS > Kernel: 4.10.17 from 'linux.org' > Xen: 4.9.0 Is there any other way to get CPU cache-misses in Xen environment? Thanks for your help! Minjun Hong
_______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
