linux-kernel - [PATCH 1/5] mm/vmalloc.c: change purge

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Message-ID: <20250415023952.27850-2-bhe@redhat.com>
Date: Tue, 15 Apr 2025 10:39:48 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org,
	urezki@...il.com,
	linux-kernel@...r.kernel.org,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH 1/5] mm/vmalloc.c: change purge_ndoes as local static variable

Static variable 'purge_ndoes' is defined in global scope, while it's
only used in function __purge_vmap_area_lazy(). It mainly serves to
avoid memory allocation repeatedly, especially when NR_CPUS is big.

While a local static variable can also satisfy the demand, and can
improve code readibility. Hence move its definition into
__purge_vmap_area_lazy().

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 6ee7fc2ec986..aca1905d3397 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2128,7 +2128,6 @@ static DEFINE_MUTEX(vmap_purge_lock);
 
 /* for per-CPU blocks */
 static void purge_fragmented_blocks_allcpus(void);
-static cpumask_t purge_nodes;
 
 static void
 reclaim_list_global(struct list_head *head)
@@ -2261,6 +2260,7 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end,
 {
 	unsigned long nr_purged_areas = 0;
 	unsigned int nr_purge_helpers;
+	static cpumask_t purge_nodes;
 	unsigned int nr_purge_nodes;
 	struct vmap_node *vn;
 	int i;
-- 
2.41.0