Não há eventos de hardware na lista de execução no PC com CPU Intel Core i7-4770 executando o Ubuntu Server?

Question

Tenho um excelente desktop com a CPU Intel Core i7-4770 @ 3.4GHz.

Lá, eu instalei o servidor Ubuntu 15.04. Depois eu instalei linux-tools-generic e linux-tools-common para instalar ferramentas perf. No entanto, quando executo perf list , a seção de hardware não está lá, nem mesmo "não suportada". A única outra coisa que fiz antes é instalar o xen, e o Ubuntu está atualmente rodando como Dom0. Não tenho certeza se isso pode ter algum efeito no meu problema.

Aqui está o que recebo do comando perf list :

ubuntuuser@ubuntu:~/work/linux$ perf list

List of pre-defined events (to be used in -e):
  cpu-clock                                          [Software event]
  task-clock                                         [Software event]
  page-faults OR faults                              [Software event]
  context-switches OR cs                             [Software event]
  cpu-migrations OR migrations                       [Software event]
  minor-faults                                       [Software event]
  major-faults                                       [Software event]
  alignment-faults                                   [Software event]
  emulation-faults                                   [Software event]
  dummy                                              [Software event]

  power/energy-cores/                                [Kernel PMU event]
  power/energy-gpu/                                  [Kernel PMU event]
  power/energy-pkg/                                  [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>[:access]                                [Hardware breakpoint]

  [ Tracepoints not available: Permission denied ]

Eu gostaria de saber qual é o meu problema? É a própria CPU que não tem suporte para eventos de hardware? Ou é o kernel do repositório que não tem eventos de hardware habilitados? Se for apenas kernel, acho que vou ter que

    

Answer 1

Eu também não encontrei nenhum evento de hardware listado, até depois de usar alguns. Agora, mesmo depois de uma nova reinicialização, alguns estão listados:

doug@s15:~$ perf list hw

List of pre-defined events (to be used in -e):

  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
  ref-cycles                                         [Hardware event]
  stalled-cycles-backend OR idle-cycles-backend      [Hardware event]
  stalled-cycles-frontend OR idle-cycles-frontend    [Hardware event]

doug@s15:~$ perf list pmu

List of pre-defined events (to be used in -e):

  branch-instructions OR cpu/branch-instructions/    [Kernel PMU event]
  branch-misses OR cpu/branch-misses/                [Kernel PMU event]
  bus-cycles OR cpu/bus-cycles/                      [Kernel PMU event]
  cache-misses OR cpu/cache-misses/                  [Kernel PMU event]
  cache-references OR cpu/cache-references/          [Kernel PMU event]
  cpu-cycles OR cpu/cpu-cycles/                      [Kernel PMU event]
  instructions OR cpu/instructions/                  [Kernel PMU event]
  mem-loads OR cpu/mem-loads/                        [Kernel PMU event]
  mem-stores OR cpu/mem-stores/                      [Kernel PMU event]
  power/energy-cores/                                [Kernel PMU event]
  power/energy-gpu/                                  [Kernel PMU event]
  power/energy-pkg/                                  [Kernel PMU event]
  ref-cycles OR cpu/ref-cycles/                      [Kernel PMU event]
  stalled-cycles-backend OR cpu/stalled-cycles-backend/ [Kernel PMU event]
  stalled-cycles-frontend OR cpu/stalled-cycles-frontend/ [Kernel PMU event]
  uncore_cbox_0/clockticks/                          [Kernel PMU event]
  uncore_cbox_1/clockticks/                          [Kernel PMU event]
  uncore_cbox_2/clockticks/                          [Kernel PMU event]
  uncore_cbox_3/clockticks/                          [Kernel PMU event]
  uncore_imc/data_reads/                             [Kernel PMU event]
  uncore_imc/data_writes/                            [Kernel PMU event]

Mais cedo eu fiz isso:

doug@s15:~$ sudo ~/bin/perf stat -a sleep 5

 Performance counter stats for 'system wide':

      39997.230896      task-clock (msec)         #    7.998 CPUs utilized            (100.00%)
               396      context-switches          #    0.010 K/sec                    (100.00%)
                 8      cpu-migrations            #    0.000 K/sec                    (100.00%)
                82      page-faults               #    0.002 K/sec
       359,328,178      cycles                    #    0.009 GHz                      (83.29%)
       827,261,275      stalled-cycles-frontend   #  230.22% frontend cycles idle     (83.33%)
       797,161,705      stalled-cycles-backend    #  221.85% backend  cycles idle     (66.74%)
        49,220,050      instructions              #    0.14  insns per cycle
                                                  #   16.81  stalled cycles per insn  (83.37%)
        10,011,396      branches                  #    0.250 M/sec                    (83.37%)
         1,800,790      branch-misses             #   17.99% of all branches          (83.29%)

       5.000925953 seconds time elapsed

doug@s15:~$ sudo ~/bin/perf stat -e cycles,instructions,cache-references,cache-misses,bus-cycles -a sleep 5

 Performance counter stats for 'system wide':

        24,268,338      cycles                                                        (100.00%)
         8,505,561      instructions              #    0.35  insns per cycle          (100.00%)
           657,099      cache-references                                              (100.00%)
            73,174      cache-misses              #   11.136 % of all cache refs      (100.00%)
         1,507,017      bus-cycles

       5.001004407 seconds time elapsed

doug@s15:~$ sudo ~/bin/perf stat -e L1-dcache-loads,L1-dcache-load-misses,L1-dcache-stores sleep 5

 Performance counter stats for 'sleep 5':

           170,208      L1-dcache-loads
            14,139      L1-dcache-load-misses     #    8.31% of all L1-dcache hits
     <not counted>      L1-dcache-stores           (0.00%)

       5.000957676 seconds time elapsed

Eu não sei como se minha lista está completa, nem como obter a lista completa se não estiver.