linux-kernel - [PATCH] mm/page_alloc: clear node_load[] in function build

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Message-Id: <20220115230002.490-1-richard.weiyang@gmail.com>
Date:   Sat, 15 Jan 2022 23:00:02 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, mhocko@...e.com,
        Wei Yang <richard.weiyang@...il.com>
Subject: [PATCH] mm/page_alloc: clear node_load[] in function build_zonelists

static variable node_load[] is a helper variable during build zonelist.
On each turn for building zonelist, node_load[] is cleared. So this is
proper to do this in function build_zonelist.

Another side effect is,  #ifdef CONFIG_NUMA could be removed since
node_load[] is only defined when CONFIG_NUMA is set.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 mm/page_alloc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c5952749ad40..8245f5a24aad 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6255,6 +6255,7 @@ static void build_zonelists(pg_data_t *pgdat)
 	prev_node = local_node;
 
 	memset(node_order, 0, sizeof(node_order));
+	memset(node_load, 0, sizeof(node_load));
 	while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
 		/*
 		 * We don't want to pressure a particular node.
@@ -6371,10 +6372,6 @@ static void __build_all_zonelists(void *data)
 
 	spin_lock(&lock);
 
-#ifdef CONFIG_NUMA
-	memset(node_load, 0, sizeof(node_load));
-#endif
-
 	/*
 	 * This node is hotadded and no memory is yet present.   So just
 	 * building zonelists is fine - no need to touch other nodes.
-- 
2.33.1