"carmel_pmu/xxx" events not supported in perf

[sunlingyu]

Hi, I am using linux perf tool to anaylize hardware performance events. Command “sudo perf list” gives me a list of events named “carmel_pmu/xxx”. But when I really collect these events by “sudo perf stat -e”, it reports “not supported”. The perf tool is compiled from L4T 32.7.1 source code.

I wonder how can I read these “carmel_pmu/xxx” events? There are severl counters related to cache behavier which are important to me.

Thanks.

[AastaLLL]

Hi,

Could you share the sample you are testing?
We try it with an online sample and didn’t meet the error you mentioned.

$ sudo ../kernel/kernel-4.9/tools/perf/perf stat -a ./out 
sum = 94479480000

 Performance counter stats for 'system wide':

      11108.602528      cpu-clock (msec)          #    7.996 CPUs utilized          
               669      context-switches          #    0.060 K/sec                  
                10      cpu-migrations            #    0.001 K/sec                  
               128      page-faults               #    0.012 K/sec                  
      31,6169,8241      cycles                    #    0.285 GHz                    
     177,3499,5310      instructions              #    5.61  insn per cycle         
   <not supported>      branches                                                    
          225,2987      branch-misses                                               

       1.389343240 seconds time elapsed

Thanks

[sunlingyu]

If you use perf list to check all supported events, you can find events starts with “carmel_pmu/”.

$ sudo perf list | grep l3d_cache
carmel_pmu/l3d_cache/ [Kernel PMU event]
carmel_pmu/l3d_cache_allocate/ [Kernel PMU event]
carmel_pmu/l3d_cache_refill/ [Kernel PMU event]
carmel_pmu/l3d_cache_wb/ [Kernel PMU event]

But if you use “perf stat -e” to collect them, you get “<not supported>”

$ sudo perf stat -e carmel_pmu/l3d_cache/ sleep 2
Performance counter stats for ‘sleep 2’:
<not supported> carmel_pmu/l3d_cache/
2.002276100 seconds time elapsed

Thanks!

[AastaLLL]

Hi,

We check this issue on r34.1.1 (JetPack 5.0.1 DP)
The event is removed from the pert list.

Is the below event enough for your use case?

$ sudo ./perf list | grep cache
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-icache-load-misses                              [Hardware cache event]
  L1-icache-loads                                    [Hardware cache event]
  branch-load-misses                                 [Hardware cache event]
  branch-loads                                       [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  iTLB-load-misses                                   [Hardware cache event]
  l1d_cache OR armv8_pmuv3/l1d_cache/                [Kernel PMU event]
  l1d_cache_refill OR armv8_pmuv3/l1d_cache_refill/  [Kernel PMU event]
  l1d_cache_wb OR armv8_pmuv3/l1d_cache_wb/          [Kernel PMU event]
  l1i_cache OR armv8_pmuv3/l1i_cache/                [Kernel PMU event]
  l1i_cache_refill OR armv8_pmuv3/l1i_cache_refill/  [Kernel PMU event]
  ext4:ext4_es_cache_extent                          [Tracepoint event]
  ext4:ext4_ext_in_cache                             [Tracepoint event]
  ext4:ext4_ext_put_in_cache                         [Tracepoint event]
  filemap:mm_filemap_add_to_page_cache               [Tracepoint event]
  filemap:mm_filemap_delete_from_page_cache          [Tracepoint event]
  kmem:kmem_cache_alloc                              [Tracepoint event]
  kmem:kmem_cache_alloc_node                         [Tracepoint event]
  kmem:kmem_cache_free                               [Tracepoint event]
  kvm:kvm_toggle_cache                               [Tracepoint event]
  nfs4:nfs4_cached_open                              [Tracepoint event]
  nvmap:nvmap_cache_flush                            [Tracepoint event]
  nvmap:nvmap_cache_maint                            [Tracepoint event]
  nvmap:pp_clean_cache                               [Tracepoint event]
  regmap:regcache_drop_region                        [Tracepoint event]
  regmap:regcache_sync                               [Tracepoint event]
  regmap:regmap_cache_bypass                         [Tracepoint event]
  regmap:regmap_cache_only                           [Tracepoint event]
  regmap:regmap_reg_read_cache                       [Tracepoint event]
  sunrpc:cache_entry_expired                         [Tracepoint event]
  sunrpc:cache_entry_make_negative                   [Tracepoint event]
  sunrpc:cache_entry_no_listener                     [Tracepoint event]
  sunrpc:cache_entry_upcall                          [Tracepoint event]
  sunrpc:cache_entry_update                          [Tracepoint event]

Thanks.