书法的透光性

我如何启用c++为perf callgraph搜索?当我进入注释模式时，它似乎需要符号，但在主callgraph中没有。

#include <benchmark/benchmark.h>
#include <vector>
static __attribute__ ((noinline)) int my_really_big_function()
{
  for(size_t i = 0; i < 1000; ++i)
  {
    benchmark::DoNotOptimize(i % 5);
  }
  return 0;
}
static __attribute__ ((noinline)) void caller1()
{
  for(size_t i = 0; i < 1000; ++i)
  {
    benchmark::DoNotOptimize(my_really_big_function());
    benchmark::DoNotOptimize(i % 5);
  }
}
static __attribute__ ((noinline)) void myfun(benchmark::State& state)
{
  while(state.KeepRunning())
  {
    caller1();
  }
}
BENCHMARK(myfun);
BENCHMARK_MAIN();

构建命令:

clang++ main.cpp -o main -fno-omit-frame-pointer -O0 -lpthread -lbenchmark

性能命令:

perf record -g ./main
perf report -g 'graph,0.5,caller'

我也试过启用——demangle选项，但这似乎不影响输出。

书写体缺少刻字符号:

Samples: 3K of event 'cycles', Event count (approx.): 2946754102
Children      Self  Command  Shared Object      Symbol
+   99.82%     0.00%  main     main               [.] _ZL5myfunRN9benchmark5StateE
+   99.82%     0.00%  main     main               [.] _ZN9benchmark12_GLOBAL__N_111RunInThreadEPKNS_8internal9Benchmark8InstanceEmiPNS0_11ThreadStatsE
+   99.82%     0.00%  main     main               [.] _ZN9benchmark22RunSpecifiedBenchmarksEPNS_17BenchmarkReporterE
+   99.82%     0.00%  main     main               [.] main
+   99.82%     0.00%  main     libc-2.21.so       [.] __libc_start_main
+   99.82%     0.00%  main     [unknown]          [.] 0x7fbe258d4c544155
+   99.75%     0.30%  main     main               [.] _ZL7caller1v
+   99.52%    99.46%  main     main               [.] _ZL22my_really_big_functionv

带注释的反汇编显示了混乱的调用:

       │
       │    0000000000404310 <caller1()>:
       │    _ZL7caller1v():
       │      push   %rbp
       │      mov    %rsp,%rbp
       |    $0x30,%rsp
       |   $0x0,-0x18(%rbp)
       │10:   cmpq   $0x3e8,-0x18(%rbp)
       │    ↓ jae    6f
       │    → callq  my_really_big_function()
       │      lea    -0x1c(%rbp),%rcx
       │      mov    %eax,-0x1c(%rbp)
 14.29 │      mov    %rcx,-0x10(%rbp)
       │      mov    -0x10(%rbp),%rcx
       │      lea    -0x28(%rbp),%rcx
       │      mov    $0x5,%eax
       │      mov    %eax,%edx
       │      mov    -0x18(%rbp),%rax
       │      xor    %esi,%esi
       │      mov    %rdx,-0x30(%rbp)
       │      mov    %esi,%edx
       │      mov    -0x30(%rbp),%rdi
       │      div    %rdi
 85.71 │      mov    %rdx,-0x28(%rbp)
       │      mov    %rcx,-0x8(%rbp)
       │      mov    -0x8(%rbp),%rcx
       │      mov    -0x18(%rbp),%rax
       │      add    $0x1,%rax
       │      mov    %rax,-0x18(%rbp)
       │    ↑ jmpq   10
       │6f:   add    $0x30,%rsp
       │      pop    %rbp
       │    ← retq

系统信息:

Ubuntu 15.04 64位
• 英特尔i5 - 6600 k
• 性能3.19.8-ckt6
• 叮当声3.6.0-2ubuntu1