perf tools: Allow hpp fields to be sort keys

Add overhead{,_sys,_us,_guest_sys,_guest_us}, sample and period sort
keys so that they can be selected with --sort/-s option.

  $ perf report -s period,comm --stdio
  ...
  # Overhead        Period          Command
  # ........  ............  ...............
  #
      47.06%           152          swapper
      13.93%            45  qemu-system-arm
      12.38%            40         synergys
       3.72%            12          firefox
       2.48%             8            xchat

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1400480762-22852-9-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index e7ac794382c1..24116a48298f 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -346,8 +346,13 @@ void perf_hpp__init(void)
         int i;
 
         for (i = 0; i < PERF_HPP__MAX_INDEX; i++) {
-                INIT_LIST_HEAD(&perf_hpp__format[i].list);
-                INIT_LIST_HEAD(&perf_hpp__format[i].sort_list);
+                struct perf_hpp_fmt *fmt = &perf_hpp__format[i];
+
+                INIT_LIST_HEAD(&fmt->list);
+
+                /* sort_list may be linked by setup_sorting() */
+                if (fmt->sort_list.next == NULL)
+                        INIT_LIST_HEAD(&fmt->sort_list);
         }
 
         perf_hpp__column_enable(PERF_HPP__OVERHEAD);