android_kernel_xiaomi_sm8450

xiaomi-sm8450/android_kernel_xiaomi_sm8450

Files

Jin Yao bb848c14f8 perf annotate: Support to display the IPC/Cycle in TUI mode

Unlike the perf report interactive annotate mode, the perf annotate
doesn't display the IPC/Cycle even if branch info is recorded in perf
data file.

perf record -b ...
perf annotate function

It should show IPC/cycle, but it doesn't.

This patch lets perf annotate support the displaying of IPC/Cycle if
branch info is in perf data.

For example,

  perf annotate compute_flag

  Percent│ IPC Cycle
         │
         │
         │                Disassembly of section .text:
         │
         │                0000000000400640 <compute_flag>:
         │                compute_flag():
         │                volatile int count;
         │                static unsigned int s_randseed;
         │
         │                __attribute__((noinline))
         │                int compute_flag()
         │                {
   22.96 │1.18   584        sub    $0x8,%rsp
         │                        int i;
         │
         │                        i = rand() % 2;
   23.02 │1.18     1      → callq  rand@plt
         │
         │                        return i;
   27.05 │3.37              mov    %eax,%edx
         │                }
         │3.37              add    $0x8,%rsp
         │                {
         │                        int i;
         │
         │                        i = rand() % 2;
         │
         │                        return i;
         │3.37              shr    $0x1f,%edx
         │3.37              add    %edx,%eax
         │3.37              and    $0x1,%eax
         │3.37              sub    %edx,%eax
         │                }
   26.97 │3.37     2      ← retq

Note that, this patch only supports TUI mode. For stdio, now it just keeps
original behavior. Will support it in a follow-up patch.

  $ perf annotate compute_flag --stdio

   Percent |      Source code & Disassembly of div for cycles:ppp (7993 samples)
  ------------------------------------------------------------------------------
           :
           :
           :
           :            Disassembly of section .text:
           :
           :            0000000000400640 <compute_flag>:
           :            compute_flag():
           :            volatile int count;
           :            static unsigned int s_randseed;
           :
           :            __attribute__((noinline))
           :            int compute_flag()
           :            {
      0.29 :   400640:       sub    $0x8,%rsp     # +100.00%
           :                    int i;
           :
           :                    i = rand() % 2;
     42.93 :   400644:       callq  400490 <rand@plt>     # -100.00% (p:100.00%)
           :
           :                    return i;
      0.10 :   400649:       mov    %eax,%edx     # +100.00%
           :            }
      0.94 :   40064b:       add    $0x8,%rsp
           :            {
           :                    int i;
           :
           :                    i = rand() % 2;
           :
           :                    return i;
     27.02 :   40064f:       shr    $0x1f,%edx
      0.15 :   400652:       add    %edx,%eax
      1.24 :   400654:       and    $0x1,%eax
      2.08 :   400657:       sub    %edx,%eax
           :            }
     25.26 :   400659:       retq # -100.00% (p:100.00%)

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/20180223170210.GC7045@tassilo.jf.intel.com
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1519724327-7773-1-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2018-03-08 11:30:52 -03:00