perf lock: Convert lockhash_table to use hlist

The hlist_head has a single entry so we can save some memory.
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/20220127000050.3011493-2-namhyung@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-lock.c

@@ -38,13 +38,13 @@ static struct perf_session *session;
 #define LOCKHASH_BITS		12
 #define LOCKHASH_SIZE		(1UL << LOCKHASH_BITS)
 
-static struct list_head lockhash_table[LOCKHASH_SIZE];
+static struct hlist_head lockhash_table[LOCKHASH_SIZE];
 
 #define __lockhashfn(key)	hash_long((unsigned long)key, LOCKHASH_BITS)
 #define lockhashentry(key)	(lockhash_table + __lockhashfn((key)))
 
 struct lock_stat {
-	struct list_head	hash_entry;
+	struct hlist_node	hash_entry;
 	struct rb_node		rb;		/* used for sorting */
 
 	/*
@@ -317,10 +317,10 @@ static struct lock_stat *pop_from_result(void)
 
 static struct lock_stat *lock_stat_findnew(void *addr, const char *name)
 {
-	struct list_head *entry = lockhashentry(addr);
+	struct hlist_head *entry = lockhashentry(addr);
 	struct lock_stat *ret, *new;
 
-	list_for_each_entry(ret, entry, hash_entry) {
+	hlist_for_each_entry(ret, entry, hash_entry) {
 		if (ret->addr == addr)
 			return ret;
 	}
@@ -339,7 +339,7 @@ static struct lock_stat *lock_stat_findnew(void *addr, const char *name)
 	strcpy(new->name, name);
 	new->wait_time_min = ULLONG_MAX;
 
-	list_add(&new->hash_entry, entry);
+	hlist_add_head(&new->hash_entry, entry);
 	return new;
 
 alloc_failed:
@@ -781,7 +781,7 @@ static void dump_map(void)
 
 	pr_info("Address of instance: name of class\n");
 	for (i = 0; i < LOCKHASH_SIZE; i++) {
-		list_for_each_entry(st, &lockhash_table[i], hash_entry) {
+		hlist_for_each_entry(st, &lockhash_table[i], hash_entry) {
 			pr_info(" %p: %s\n", st->addr, st->name);
 		}
 	}
@@ -838,7 +838,7 @@ static void sort_result(void)
 	struct lock_stat *st;
 
 	for (i = 0; i < LOCKHASH_SIZE; i++) {
-		list_for_each_entry(st, &lockhash_table[i], hash_entry) {
+		hlist_for_each_entry(st, &lockhash_table[i], hash_entry) {
 			insert_to_result(st, compare);
 		}
 	}
@@ -990,7 +990,7 @@ int cmd_lock(int argc, const char **argv)
 	int rc = 0;
 
 	for (i = 0; i < LOCKHASH_SIZE; i++)
-		INIT_LIST_HEAD(lockhash_table + i);
+		INIT_HLIST_HEAD(lockhash_table + i);
 
 	argc = parse_options_subcommand(argc, argv, lock_options, lock_subcommands,
 					lock_usage, PARSE_OPT_STOP_AT_NON_OPTION);