perf annotate: Fix hist decay

We were only decaying the entries for the offsets that were associated
with an objdump line.

That way, when we accrued the whole instruction addr range, more than
100% was appearing in some cases in the live annotation TUI.

Fix it by not traversing the source code line at all, just iterate thru
the complete addr range decaying each one.

Reported-by: Mike Galbraith <mgalbraith@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-hcae5oxa22syjrnalsxz7s6n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 199f69ec656f7a77c5c490e2f1195c9e09226e98..70f5a4dc17e9b362cc90607e6d2b7f84f48cb61d 100644 (file)
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -561,16 +561,12 @@ void symbol__annotate_decay_histogram(struct symbol *sym, int evidx)
 {
        struct annotation *notes = symbol__annotation(sym);
        struct sym_hist *h = annotation__histogram(notes, evidx);
-       struct objdump_line *pos;
-       int len = sym->end - sym->start;
+       int len = sym->end - sym->start, offset;
 
        h->sum = 0;
-
-       list_for_each_entry(pos, &notes->src->source, node) {
-               if (pos->offset != -1 && pos->offset < len) {
-                       h->addr[pos->offset] = h->addr[pos->offset] * 7 / 8;
-                       h->sum += h->addr[pos->offset];
-               }
+       for (offset = 0; offset < len; ++offset) {
+               h->addr[offset] = h->addr[offset] * 7 / 8;
+               h->sum += h->addr[offset];
        }
 }