linux-kernel - [PATCH 2/2] mm/slob: Use free_page instead of put

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Message-Id: <1350907471-2236-1-git-send-email-elezegarcia@gmail.com>
Date:	Mon, 22 Oct 2012 09:04:31 -0300
From:	Ezequiel Garcia <elezegarcia@...il.com>
To:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Cc:	Tim Bird <tim.bird@...sony.com>,
	Ezequiel Garcia <elezegarcia@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Glauber Costa <glommer@...allels.com>
Subject: [PATCH 2/2] mm/slob: Use free_page instead of put_page for page-size kmalloc allocations

When freeing objects, the slob allocator currently free empty pages
calling __free_pages(). However, page-size kmallocs are disposed
using put_page() instead.

It makes no sense to call put_page() for kernel pages that are provided
by the object allocator, so we shouldn't be doing this ourselves.

This is based on:
commit d9b7f22623b5fa9cc189581dcdfb2ac605933bf4
Author: Glauber Costa <glommer@...allels.com>
slub: use free_page instead of put_page for freeing kmalloc allocation

Cc: Christoph Lameter <cl@...ux-foundation.org>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: Matt Mackall <mpm@...enic.com>
Cc: Glauber Costa <glommer@...allels.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@...il.com>
---
 mm/slob.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/slob.c b/mm/slob.c
index a65e802..362632d 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -506,7 +506,7 @@ void kfree(const void *block)
 		unsigned int *m = (unsigned int *)(block - align);
 		slob_free(m, *m + align);
 	} else
-		put_page(sp);
+		__free_pages(sp, compound_order(sp));
 }
 EXPORT_SYMBOL(kfree);
 
-- 
1.7.8.6

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