[PATCH 4/4] perf lock contention: Show lock type with address

[Namhyung Kim <namhyung@kernel.org>]

Show lock type names after the symbol of locks if any.  This can be
useful especially when it doesn't show the lock symbols.

The indentation before the lock type parenthesis is to recognize lock
symbols more easily.

  $ sudo ./perf lock con -abl -- sleep 1
   contended   total wait     max wait     avg wait            address   symbol

          44      6.13 ms    284.49 us    139.28 us   ffffffff92e06080   tasklist_lock (rwlock)
         159    983.38 us     12.38 us      6.18 us   ffff8cc717c90000   siglock (spinlock)
          10    679.90 us    153.35 us     67.99 us   ffff8cdc2872aaf8   mmap_lock (rwsem)
           9    558.11 us    180.67 us     62.01 us   ffff8cd647914038   mmap_lock (rwsem)
          78    228.56 us      7.82 us      2.93 us   ffff8cc700061c00    (spinlock)
           5     41.60 us     16.93 us      8.32 us   ffffd853acb41468    (spinlock)
          10     37.24 us      5.87 us      3.72 us   ffff8cd560b5c200   siglock (spinlock)
           4     11.17 us      3.97 us      2.79 us   ffff8d053ddf0c80   rq_lock (spinlock)
           1      7.86 us      7.86 us      7.86 us   ffff8cd64791404c    (spinlock)
           1      4.13 us      4.13 us      4.13 us   ffff8d053d930c80   rq_lock (spinlock)
           7      3.98 us      1.67 us       568 ns   ffff8ccb92479440    (mutex)
           2      2.62 us      2.33 us      1.31 us   ffff8cc702e6ede0    (rwlock)

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-lock.c            | 45 ++++++++++++++++++----------
 tools/perf/util/bpf_skel/lock_data.h |  2 ++
 2 files changed, 32 insertions(+), 15 deletions(-)

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index c710a5d46638..a845c0ce5dc8 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -1548,27 +1548,41 @@ static void sort_result(void)
 
 static const struct {
 	unsigned int flags;
+	const char *str;
 	const char *name;
 } lock_type_table[] = {
-	{ 0,				"semaphore" },
-	{ LCB_F_SPIN,			"spinlock" },
-	{ LCB_F_SPIN | LCB_F_READ,	"rwlock:R" },
-	{ LCB_F_SPIN | LCB_F_WRITE,	"rwlock:W"},
-	{ LCB_F_READ,			"rwsem:R" },
-	{ LCB_F_WRITE,			"rwsem:W" },
-	{ LCB_F_RT,			"rtmutex" },
-	{ LCB_F_RT | LCB_F_READ,	"rwlock-rt:R" },
-	{ LCB_F_RT | LCB_F_WRITE,	"rwlock-rt:W"},
-	{ LCB_F_PERCPU | LCB_F_READ,	"pcpu-sem:R" },
-	{ LCB_F_PERCPU | LCB_F_WRITE,	"pcpu-sem:W" },
-	{ LCB_F_MUTEX,			"mutex" },
-	{ LCB_F_MUTEX | LCB_F_SPIN,	"mutex" },
+	{ 0,				"semaphore",	"semaphore" },
+	{ LCB_F_SPIN,			"spinlock",	"spinlock" },
+	{ LCB_F_SPIN | LCB_F_READ,	"rwlock:R",	"rwlock" },
+	{ LCB_F_SPIN | LCB_F_WRITE,	"rwlock:W",	"rwlock" },
+	{ LCB_F_READ,			"rwsem:R",	"rwsem" },
+	{ LCB_F_WRITE,			"rwsem:W",	"rwsem" },
+	{ LCB_F_RT,			"rt=mutex",	"rt-mutex" },
+	{ LCB_F_RT | LCB_F_READ,	"rwlock-rt:R",	"rwlock-rt" },
+	{ LCB_F_RT | LCB_F_WRITE,	"rwlock-rt:W",	"rwlock-rt" },
+	{ LCB_F_PERCPU | LCB_F_READ,	"pcpu-sem:R",	"percpu-rwsem" },
+	{ LCB_F_PERCPU | LCB_F_WRITE,	"pcpu-sem:W",	"percpu-rwsem" },
+	{ LCB_F_MUTEX,			"mutex",	"mutex" },
+	{ LCB_F_MUTEX | LCB_F_SPIN,	"mutex",	"mutex" },
 	/* alias for get_type_flag() */
-	{ LCB_F_MUTEX | LCB_F_SPIN,	"mutex-spin" },
+	{ LCB_F_MUTEX | LCB_F_SPIN,	"mutex-spin",	"mutex" },
 };
 
 static const char *get_type_str(unsigned int flags)
 {
+	flags &= LCB_F_MAX_FLAGS - 1;
+
+	for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) {
+		if (lock_type_table[i].flags == flags)
+			return lock_type_table[i].str;
+	}
+	return "unknown";
+}
+
+static const char *get_type_name(unsigned int flags)
+{
+	flags &= LCB_F_MAX_FLAGS - 1;
+
 	for (unsigned int i = 0; i < ARRAY_SIZE(lock_type_table); i++) {
 		if (lock_type_table[i].flags == flags)
 			return lock_type_table[i].name;
@@ -1662,7 +1676,8 @@ static void print_contention_result(struct lock_contention *con)
 				pid, pid == -1 ? "Unknown" : thread__comm_str(t));
 			break;
 		case LOCK_AGGR_ADDR:
-			pr_info("  %016llx   %s\n", (unsigned long long)st->addr, st->name);
+			pr_info("  %016llx   %s (%s)\n", (unsigned long long)st->addr,
+				st->name, get_type_name(st->flags));
 			break;
 		default:
 			break;
diff --git a/tools/perf/util/bpf_skel/lock_data.h b/tools/perf/util/bpf_skel/lock_data.h
index e59366f2dba3..1ba61cb4d480 100644
--- a/tools/perf/util/bpf_skel/lock_data.h
+++ b/tools/perf/util/bpf_skel/lock_data.h
@@ -22,6 +22,8 @@ struct contention_task_data {
 #define LCD_F_MMAP_LOCK		(1U << 31)
 #define LCD_F_SIGHAND_LOCK	(1U << 30)
 
+#define LCB_F_MAX_FLAGS		(1U << 7)
+
 struct contention_data {
 	u64 total_time;
 	u64 min_time;
-- 
2.40.0.rc1.284.g88254d51c5-goog