linux-kernel - [PATCH 1/6] perf lock: Convert lockhash

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Date:   Tue,  4 Jan 2022 10:20:49 -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 1/6] 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@...nel.org>
---
 tools/perf/builtin-lock.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index d70131b7b1b1..43139166f02e 100644
--- a/tools/perf/builtin-lock.c
+++ b/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);
-- 
2.34.1.448.ga2b2bfdf31-goog