linux-kernel - [PATCH 2/5] add buffer cache information to show_free

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Message-Id: <20090705182337.08F9.A69D9226@jp.fujitsu.com>
Date:	Sun,  5 Jul 2009 18:24:07 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com
Subject: [PATCH 2/5] add buffer cache information to show_free_areas()

Subject: [PATCH] add buffer cache information to show_free_areas()

When administrator analysis memory shortage reason from OOM log, They
often need to know rest number of cache like pages.

Then, show_free_areas() shouldn't only display page cache, but also it
should display buffer cache.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 mm/page_alloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: b/mm/page_alloc.c
===================================================================
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2118,7 +2118,7 @@ void show_free_areas(void)
 	printk("Active_anon:%lu active_file:%lu inactive_anon:%lu\n"
 		" inactive_file:%lu"
 		" unevictable:%lu"
-		" dirty:%lu writeback:%lu unstable:%lu\n"
+		" dirty:%lu writeback:%lu buffer:%lu unstable:%lu\n"
 		" free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
 		" mapped:%lu pagetables:%lu bounce:%lu\n",
 		global_page_state(NR_ACTIVE_ANON),
@@ -2128,6 +2128,7 @@ void show_free_areas(void)
 		global_page_state(NR_UNEVICTABLE),
 		global_page_state(NR_FILE_DIRTY),
 		global_page_state(NR_WRITEBACK),
+		K(nr_blockdev_pages()),
 		global_page_state(NR_UNSTABLE_NFS),
 		global_page_state(NR_FREE_PAGES),
 		global_page_state(NR_SLAB_RECLAIMABLE),


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