From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 25 Jul 2011 06:55:42 +0000 (+0200)
Subject: slab: remove one NR_CPUS dependency
X-Git-Tag: firefly_0821_release~3680^2~4796^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=acfe7d74484d6ccb25a80b8ff259fceceac0473e;p=firefly-linux-kernel-4.4.55.git

slab: remove one NR_CPUS dependency

Reduce high order allocations in do_tune_cpucache() for some setups.
(NR_CPUS=4096 -> we need 64KB)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
---

diff --git a/mm/slab.c b/mm/slab.c
index 1e523ed47c61..b80282aef73b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3934,7 +3934,7 @@ fail:
 
 struct ccupdate_struct {
 	struct kmem_cache *cachep;
-	struct array_cache *new[NR_CPUS];
+	struct array_cache *new[0];
 };
 
 static void do_ccupdate_local(void *info)
@@ -3956,7 +3956,8 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
 	struct ccupdate_struct *new;
 	int i;
 
-	new = kzalloc(sizeof(*new), gfp);
+	new = kzalloc(sizeof(*new) + nr_cpu_ids * sizeof(struct array_cache *),
+		      gfp);
 	if (!new)
 		return -ENOMEM;