linux-kernel - [PATCH -mm] slab: document kmalloc

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Date:	Fri, 11 Apr 2014 16:52:16 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	<akpm@...ux-foundation.org>
CC:	<cl@...ux-foundation.org>, <penberg@...nel.org>,
	<gthelen@...gle.com>, <hannes@...xchg.org>, <mhocko@...e.cz>,
	<glommer@...il.com>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <devel@...nvz.org>
Subject: [PATCH -mm] slab: document kmalloc_order

Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>
---
 mm/slab_common.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index cab4c49b3e8c..3ffd2e76b5d2 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -573,6 +573,11 @@ void __init create_kmalloc_caches(unsigned long flags)
 }
 #endif /* !CONFIG_SLOB */
 
+/*
+ * To avoid unnecessary overhead, we pass through large allocation requests
+ * directly to the page allocator. We use __GFP_COMP, because we will need to
+ * know the allocation order to free the pages properly in kfree.
+ */
 void *kmalloc_order(size_t size, gfp_t flags, unsigned int order)
 {
 	void *ret;
-- 
1.7.10.4

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