perf tools: Update srcline/file if needed

Normally the hist entry's srcline and/or srcfile is set during sorting.
However sometime it's possible to a hist entry's srcline is not set yet
after the sorting.  This is because the entry is so unique and other
sort keys already make it distinct.  Then the srcline/file sort didn't
have a chance to be called during the sorting.  In that case it has NULL
srcline/srcfile field and shows nothing.

Before:

  $ perf report -s comm,sym,srcline
  ...
  Overhead  Command       Symbol
  -----------------------------------------------------------------
    34.42%  swapper       [k] intel_idle          intel_idle.c:0
     2.44%  perf          [.] __poll_nocancel     (null)
     1.70%  gnome-shell   [k] fw_domains_get      (null)
     1.04%  Xorg          [k] sock_poll           (null)

After:

    34.42%  swapper       [k] intel_idle          intel_idle.c:0
     2.44%  perf          [.] __poll_nocancel     .:0
     1.70%  gnome-shell   [k] fw_domains_get      fw_domains_get+42
     1.04%  Xorg          [k] sock_poll           socket.c:0

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1456101111-14400-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 7daea71..6f4605b 100644 (file)
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -286,35 +286,34 @@ struct sort_entry sort_sym = {
 
 /* --sort srcline */
 
+static char *hist_entry__get_srcline(struct hist_entry *he)
+{
+       struct map *map = he->ms.map;
+
+       if (!map)
+               return SRCLINE_UNKNOWN;
+
+       return get_srcline(map->dso, map__rip_2objdump(map, he->ip),
+                          he->ms.sym, true);
+}
+
 static int64_t
 sort__srcline_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-       if (!left->srcline) {
-               if (!left->ms.map)
-                       left->srcline = SRCLINE_UNKNOWN;
-               else {
-                       struct map *map = left->ms.map;
-                       left->srcline = get_srcline(map->dso,
-                                          map__rip_2objdump(map, left->ip),
-                                                   left->ms.sym, true);
-               }
-       }
-       if (!right->srcline) {
-               if (!right->ms.map)
-                       right->srcline = SRCLINE_UNKNOWN;
-               else {
-                       struct map *map = right->ms.map;
-                       right->srcline = get_srcline(map->dso,
-                                            map__rip_2objdump(map, right->ip),
-                                                    right->ms.sym, true);
-               }
-       }
+       if (!left->srcline)
+               left->srcline = hist_entry__get_srcline(left);
+       if (!right->srcline)
+               right->srcline = hist_entry__get_srcline(right);
+
        return strcmp(right->srcline, left->srcline);
 }
 
 static int hist_entry__srcline_snprintf(struct hist_entry *he, char *bf,
                                        size_t size, unsigned int width)
 {
+       if (!he->srcline)
+               he->srcline = hist_entry__get_srcline(he);
+
        return repsep_snprintf(bf, size, "%-*.*s", width, width, he->srcline);
 }
 
@@ -329,11 +328,14 @@ struct sort_entry sort_srcline = {
 
 static char no_srcfile[1];
 
-static char *get_srcfile(struct hist_entry *e)
+static char *hist_entry__get_srcfile(struct hist_entry *e)
 {
        char *sf, *p;
        struct map *map = e->ms.map;
 
+       if (!map)
+               return no_srcfile;
+
        sf = __get_srcline(map->dso, map__rip_2objdump(map, e->ip),
                         e->ms.sym, false, true);
        if (!strcmp(sf, SRCLINE_UNKNOWN))
@@ -350,24 +352,20 @@ static char *get_srcfile(struct hist_entry *e)
 static int64_t
 sort__srcfile_cmp(struct hist_entry *left, struct hist_entry *right)
 {
-       if (!left->srcfile) {
-               if (!left->ms.map)
-                       left->srcfile = no_srcfile;
-               else
-                       left->srcfile = get_srcfile(left);
-       }
-       if (!right->srcfile) {
-               if (!right->ms.map)
-                       right->srcfile = no_srcfile;
-               else
-                       right->srcfile = get_srcfile(right);
-       }
+       if (!left->srcfile)
+               left->srcfile = hist_entry__get_srcfile(left);
+       if (!right->srcfile)
+               right->srcfile = hist_entry__get_srcfile(right);
+
        return strcmp(right->srcfile, left->srcfile);
 }
 
 static int hist_entry__srcfile_snprintf(struct hist_entry *he, char *bf,
                                        size_t size, unsigned int width)
 {
+       if (!he->srcfile)
+               he->srcfile = hist_entry__get_srcfile(he);
+
        return repsep_snprintf(bf, size, "%-*.*s", width, width, he->srcfile);
 }