• Andi Kleen's avatar
    perf tools: Support 'srccode' output · dd2e18e9
    Andi Kleen authored
    When looking at PT or brstackinsn traces with 'perf script' it can be
    very useful to see the source code. This adds a simple facility to print
    them with 'perf script', if the information is available through dwarf
    
      % perf record ...
      % perf script -F insn,ip,sym,srccode
      ...
    
                4004c6 main
      5               for (i = 0; i < 10000000; i++)
                 4004cd main
      5               for (i = 0; i < 10000000; i++)
                 4004c6 main
      5               for (i = 0; i < 10000000; i++)
                 4004cd main
      5               for (i = 0; i < 10000000; i++)
                 4004cd main
      5               for (i = 0; i < 10000000; i++)
                 4004cd main
      5               for (i = 0; i < 10000000; i++)
                 4004cd main
      5               for (i = 0; i < 10000000; i++)
                 4004cd main
      5               for (i = 0; i < 10000000; i++)
                 4004b3 main
      6                       v++;
    
      % perf record -b ...
      % perf script -F insn,ip,sym,srccode,brstackinsn
    
      ...
             main+22:
              0000000000400543        insn: e8 ca ff ff ff            # PRED
      |18                     f1();
              f1:
              0000000000400512        insn: 55
      |10       {
              0000000000400513        insn: 48 89 e5
              0000000000400516        insn: b8 00 00 00 00
      |11             f2();
              000000000040051b        insn: e8 d6 ff ff ff            # PRED
              f2:
              00000000004004f6        insn: 55
      |5        {
              00000000004004f7        insn: 48 89 e5
              00000000004004fa        insn: 8b 05 2c 0b 20 00
      |6              c = a / b;
              0000000000400500        insn: 8b 0d 2a 0b 20 00
              0000000000400506        insn: 99
              0000000000400507        insn: f7 f9
              0000000000400509        insn: 89 05 29 0b 20 00
              000000000040050f        insn: 90
      |7        }
              0000000000400510        insn: 5d
              0000000000400511        insn: c3                        # PRED
              f1+14:
              0000000000400520        insn: b8 00 00 00 00
      |12             f2();
              0000000000400525        insn: e8 cc ff ff ff            # PRED
              f2:
              00000000004004f6        insn: 55
      |5        {
              00000000004004f7        insn: 48 89 e5
              00000000004004fa        insn: 8b 05 2c 0b 20 00
      |6              c = a / b;
    
    Not supported for callchains currently, would need some layout changes
    there.
    
    Committer notes:
    
    Fixed the build on Alpine Linux (3.4 .. 3.8) by addressing this
    warning:
    
      In file included from util/srccode.c:19:0:
      /usr/include/sys/fcntl.h:1:2: error: #warning redirecting incorrect #include <sys/fcntl.h> to <fcntl.h> [-Werror=cpp]
       #warning redirecting incorrect #include <sys/fcntl.h> to <fcntl.h>
        ^~~~~~~
      cc1: all warnings being treated as errors
    Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
    Tested-by: default avatarJiri Olsa <jolsa@kernel.org>
    Link: http://lkml.kernel.org/r/20181204001848.24769-1-andi@firstfloor.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    dd2e18e9
srcline.c 14.2 KB