linux-kernel - [PATCH 3/6] perf lock: Sort map info based on class name

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Date:   Tue,  4 Jan 2022 10:20:51 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH 3/6] perf lock: Sort map info based on class name

Instead of the random order, sort it by lock class name.

Before:
  # perf lock info -m
  Address of instance: name of class
   0xffffa0d940ac5310: &dentry->d_lockref.lock
   0xffffa0c20b0e1cb0: &dentry->d_lockref.lock
   0xffffa0d8e051cc48: &base->lock
   0xffffa0d94f992110: &anon_vma->rwsem
   0xffffa0d947a4f278: (null)
   0xffffa0c208f6e108: &map->lock
   0xffffa0c213ad32c8: &cfs_rq->removed.lock
   0xffffa0c20d695888: &parent->list_lock
   0xffffa0c278775278: (null)
   0xffffa0c212ad4690: &dentry->d_lockref.lock

After:
  # perf lock info -m
  Address of instance: name of class
   0xffffa0c20d538800: &(&sig->stats_lock)->lock
   0xffffa0c216d4ec40: &(&sig->stats_lock)->lock
   0xffffa1fe4cb04610: &(__futex_data.queues)[i].lock
   0xffffa1fe4cb07750: &(__futex_data.queues)[i].lock
   0xffffa1fe4cb07b50: &(__futex_data.queues)[i].lock
   0xffffa1fe4cb0b850: &(__futex_data.queues)[i].lock
   0xffffa1fe4cb0bcd0: &(__futex_data.queues)[i].lock
   0xffffa1fe4cb0e5d0: &(__futex_data.queues)[i].lock
   0xffffa1fe4cb11ad0: &(__futex_data.queues)[i].lock

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-lock.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index c4b5c3d71ae3..8078f7ca826d 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -757,6 +757,21 @@ static void dump_threads(void)
 	}
 }
 
+static int compare_maps(struct lock_stat *a, struct lock_stat *b)
+{
+	int ret;
+
+	if (a->name && b->name)
+		ret = strcmp(a->name, b->name);
+	else
+		ret = !!a->name - !!b->name;
+
+	if (!ret)
+		return a->addr < b->addr;
+	else
+		return ret < 0;
+}
+
 static void dump_map(void)
 {
 	unsigned int i;
@@ -765,9 +780,12 @@ static void dump_map(void)
 	pr_info("Address of instance: name of class\n");
 	for (i = 0; i < LOCKHASH_SIZE; i++) {
 		hlist_for_each_entry(st, &lockhash_table[i], hash_entry) {
-			pr_info(" %#llx: %s\n", (unsigned long long)st->addr, st->name);
+			insert_to_result(st, compare_maps);
 		}
 	}
+
+	while ((st = pop_from_result()))
+		pr_info(" %#llx: %s\n", (unsigned long long)st->addr, st->name);
 }
 
 static int dump_info(void)
-- 
2.34.1.448.ga2b2bfdf31-goog