perf lock: Fix sorting by wait_min

If lock was uncontended, wait_time_min == ULLONG_MAX, so we need to
handle this case differently to show high wait times first

Acked-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110222174715.GC9687@joi.lan>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 2e93f99b148..7a2a79d2cf2 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -202,9 +202,20 @@ static struct thread_stat *thread_stat_findnew_first(u32 tid)
 SINGLE_KEY(nr_acquired)
 SINGLE_KEY(nr_contended)
 SINGLE_KEY(wait_time_total)
-SINGLE_KEY(wait_time_min)
 SINGLE_KEY(wait_time_max)
 
+static int lock_stat_key_wait_time_min(struct lock_stat *one,
+                                        struct lock_stat *two)
+{
+        u64 s1 = one->wait_time_min;
+        u64 s2 = two->wait_time_min;
+        if (s1 == ULLONG_MAX)
+                s1 = 0;
+        if (s2 == ULLONG_MAX)
+                s2 = 0;
+        return s1 > s2;
+}
+
 struct lock_key {
         /*
          * name: the value for specify by user