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Message-ID: <20250418223653.243436-2-bhe@redhat.com>
Date: Sat, 19 Apr 2025 06:36:49 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org,
urezki@...il.com,
shivankg@....com,
vishal.moola@...il.com,
linux-kernel@...r.kernel.org,
Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 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>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@...il.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
Reviewed-by: Shivank Garg <shivankg@....com>
---
mm/vmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3ed720a787ec..38d8d8d60985 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2111,7 +2111,6 @@ 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)
@@ -2244,6 +2243,7 @@ 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
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