• Arnaldo Carvalho de Melo's avatar
    perf trace: Support 'strace' syscall event groups · 005438a8
    Arnaldo Carvalho de Melo authored
    I.e.:
    
      $ cat ~/share/perf-core/strace/groups/file
      access
      chmod
      creat
      execve
      faccessat
      getcwd
      lstat
      mkdir
      open
      openat
      quotactl
      readlink
      rename
      rmdir
      stat
      statfs
      symlink
      unlink
      $
    
    Then, on a quiet desktop, try running this and then moving your mouse to
    see the deluge of mouse related activity:
    
      # perf probe 'vfs_getname=getname_flags:72 pathname=filename:string'
      Added new event:
        probe:vfs_getname    (on getname_flags:72 with pathname=filename:string)
    
      You can now use it in all perf tools, such as:
    
    	perf record -e probe:vfs_getname -aR sleep 1
      #
      # trace --ev probe:vfs_getname --filter-pids 2232 -e file
       0.042 (0.042 ms): mousetweaks/2235 open(filename: 0x14e3910, mode: 438                                   ) ...
       0.042 (        ): probe:vfs_getname:(ffffffff812230bc) pathname="/home/acme/.icons/Adwaita/cursors/xterm")
       0.100 (0.100 ms): mousetweaks/2235  ... [continued]: open()) = -1 ENOENT No such file or directory
       0.142 (0.018 ms): mousetweaks/2235 open(filename: 0x14c3c10, mode: 438                                   ) ...
       0.142 (        ): probe:vfs_getname:(ffffffff812230bc) pathname="/home/acme/.icons/Adwaita/index.theme")
       0.192 (0.069 ms): mousetweaks/2235  ... [continued]: open()) = -1 ENOENT No such file or directory
       0.230 (0.017 ms): mousetweaks/2235 open(filename: 0x14c3c10, mode: 438                                   ) ...
       0.230 (        ): probe:vfs_getname:(ffffffff812230bc) pathname="/usr/share/icons/Adwaita/cursors/xterm")
       0.253 (0.041 ms): mousetweaks/2235  ... [continued]: open()) = 14
       0.459 (0.008 ms): mousetweaks/2235 open(filename: 0x14e3910, mode: 438                                   ) ...
       0.459 (        ): probe:vfs_getname:(ffffffff812230bc) pathname="/home/acme/.icons/Adwaita/cursors/left_side")
       0.468 (0.017 ms): mousetweaks/2235  ... [continued]: open()) = -1 ENOENT No such file or directory
    
    Need to combine that raw_syscalls:sys_enter(open) + probe:vfs_getname +
    raw_syscalls:sys_exit(open) sequence...
    
    Now, if you're bored, please write some more syscall groups, like the ones
    in 'strace' and send it our way :-)
    
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Milian Wolff <mail@milianw.de>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Stephane Eranian <eranian@google.com>
    Link: http://lkml.kernel.org/n/tip-a42xklu59lcbxp7bbnic74a8@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    005438a8
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