linux-kernel - Re: [PATCH v3 4/9] slab: factor out initialization of arracy cache

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Message-ID: <20140702004615.GC9972@js1304-P5Q-DELUXE>
Date:	Wed, 2 Jul 2014 09:46:15 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: [PATCH v3 4/9] slab: factor out initialization of arracy cache

On Tue, Jul 01, 2014 at 03:26:26PM -0700, David Rientjes wrote:
> On Tue, 1 Jul 2014, Joonsoo Kim wrote:
> 
> > Factor out initialization of array cache to use it in following patch.
> > 
> > Acked-by: Christoph Lameter <cl@...ux.com>
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> Not sure what happened to my
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 
> from http://marc.info/?l=linux-mm&m=139951195724487 and my comment still 
> stands about s/arracy/array/ in the patch title.

This is new one with applying your comment.

Thanks.

--------------8<--------------
>From 5d4f47d839ae4fc0796b633d41858d9c87fd235d Mon Sep 17 00:00:00 2001
From: Joonsoo Kim <iamjoonsoo.kim@....com>
Date: Fri, 30 Aug 2013 14:34:38 +0900
Subject: [PATCH v4 4/9] slab: factor out initialization of array cache

Factor out initialization of array cache to use it in following patch.

Acked-by: Christoph Lameter <cl@...ux.com>
Acked-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/slab.c |   33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 8f9e176..6fa3fdf 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -791,13 +791,8 @@ static void start_cpu_timer(int cpu)
 	}
 }
 
-static struct array_cache *alloc_arraycache(int node, int entries,
-					    int batchcount, gfp_t gfp)
+static void init_arraycache(struct array_cache *ac, int limit, int batch)
 {
-	int memsize = sizeof(void *) * entries + sizeof(struct array_cache);
-	struct array_cache *nc = NULL;
-
-	nc = kmalloc_node(memsize, gfp, node);
 	/*
 	 * The array_cache structures contain pointers to free object.
 	 * However, when such objects are allocated or transferred to another
@@ -805,15 +800,25 @@ static struct array_cache *alloc_arraycache(int node, int entries,
 	 * valid references during a kmemleak scan. Therefore, kmemleak must
 	 * not scan such objects.
 	 */
-	kmemleak_no_scan(nc);
-	if (nc) {
-		nc->avail = 0;
-		nc->limit = entries;
-		nc->batchcount = batchcount;
-		nc->touched = 0;
-		spin_lock_init(&nc->lock);
+	kmemleak_no_scan(ac);
+	if (ac) {
+		ac->avail = 0;
+		ac->limit = limit;
+		ac->batchcount = batch;
+		ac->touched = 0;
+		spin_lock_init(&ac->lock);
 	}
-	return nc;
+}
+
+static struct array_cache *alloc_arraycache(int node, int entries,
+					    int batchcount, gfp_t gfp)
+{
+	int memsize = sizeof(void *) * entries + sizeof(struct array_cache);
+	struct array_cache *ac = NULL;
+
+	ac = kmalloc_node(memsize, gfp, node);
+	init_arraycache(ac, entries, batchcount);
+	return ac;
 }
 
 static inline bool is_slab_pfmemalloc(struct page *page)
-- 
1.7.9.5

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