linux-kernel - [PATCH v2 07/11] mm/migration: avoid unneeded nodemask

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Message-ID: <20220318111709.60311-8-linmiaohe@huawei.com>
Date:   Fri, 18 Mar 2022 19:17:05 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <ziy@...dia.com>, <baolin.wang@...ux.alibaba.com>,
        <ying.huang@...el.com>, <songmuchun@...edance.com>,
        <apopple@...dia.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v2 07/11] mm/migration: avoid unneeded nodemask_t initialization

Avoid unneeded next_pass and this_pass initialization as they're always
set before using to save possible cpu cycles when there are plenty of
nodes in the system.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/migrate.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 92068d090db8..bb36f6b40f18 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2379,8 +2379,8 @@ static int establish_migrate_target(int node, nodemask_t *used,
  */
 static void __set_migration_target_nodes(void)
 {
-	nodemask_t next_pass	= NODE_MASK_NONE;
-	nodemask_t this_pass	= NODE_MASK_NONE;
+	nodemask_t next_pass;
+	nodemask_t this_pass;
 	nodemask_t used_targets = NODE_MASK_NONE;
 	int node, best_distance;
 
-- 
2.23.0