perf lock: Fix lock name length check for printing

It has 20 character spaces for name so lock names shorter than 20
should be printed without ellipsis.

Before:
 # perf lock report
                Name   acquired  contended   avg wait (ns) total wait (ns)   max wait (ns)   min wait (ns)

       rcu_read_lock     251225          0               0               0               0               0
 &(ei->i_block_re...       8731          0               0               0               0               0
 &sb->s_type->i_l...       8731          0               0               0               0               0
 hrtimer_bases.lo...       5261          0               0               0               0               0
 hrtimer_bases.lo...       2626          0               0               0               0               0
 hrtimer_bases.lo...       1953          0               0               0               0               0
 hrtimer_bases.lo...       1382          0               0               0               0               0
 cpu_hotplug_lock...       1350          0               0               0               0               0

After:
 # perf lock report
                Name   acquired  contended   avg wait (ns) total wait (ns)   max wait (ns)   min wait (ns)

       rcu_read_lock     251225          0               0               0               0               0
 &(ei->i_block_re...       8731          0               0               0               0               0
 &sb->s_type->i_l...       8731          0               0               0               0               0
  hrtimer_bases.lock       5261          0               0               0               0               0
  hrtimer_bases.lock       2626          0               0               0               0               0
  hrtimer_bases.lock       1953          0               0               0               0               0
  hrtimer_bases.lock       1382          0               0               0               0               0
    cpu_hotplug_lock       1350          0               0               0               0               0

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220127000050.3011493-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 8078f7c..f6adf3c 100644 (file)
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -710,7 +710,7 @@ static void print_result(void)
                }
                bzero(cut_name, 20);
 
-               if (strlen(st->name) < 16) {
+               if (strlen(st->name) < 20) {
                        /* output raw name */
                        pr_info("%20s ", st->name);
                } else {