linux-kernel - [RFC 8/8] Add some debug output

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Message-Id: <20070419163545.11948.60373.sendpatchset@schroedinger.engr.sgi.com>
Date:	Thu, 19 Apr 2007 09:35:45 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <nickpiggin@...oo.com.au>, Andi Kleen <ak@...e.de>,
	Paul Jackson <pj@....com>, Dave Chinner <dgc@....com>,
	Christoph Lameter <clameter@....com>
Subject: [RFC 8/8] Add some debug output

Debugging patch

Show some output as to what is going on.

Signed-off-by: Christoph Lameter <clameter@....com>

---
 fs/ramfs/inode.c |    1 +
 mm/filemap.c     |    8 ++++++++
 2 files changed, 9 insertions(+)

Index: linux-2.6.21-rc7/fs/ramfs/inode.c
===================================================================
--- linux-2.6.21-rc7.orig/fs/ramfs/inode.c	2007-04-19 09:14:35.000000000 -0700
+++ linux-2.6.21-rc7/fs/ramfs/inode.c	2007-04-19 09:14:42.000000000 -0700
@@ -174,6 +174,7 @@ static int ramfs_fill_super(struct super
 	if (options && *options)
 		order = simple_strtoul(options, NULL, 10);
 
+	printk(KERN_ERR "ramfs_fill_super: '%s' order=%d\n", options, order);
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	sb->s_blocksize = PAGE_CACHE_SIZE << order;
 	sb->s_blocksize_bits = order + PAGE_CACHE_SHIFT;
Index: linux-2.6.21-rc7/mm/filemap.c
===================================================================
--- linux-2.6.21-rc7.orig/mm/filemap.c	2007-04-19 09:14:16.000000000 -0700
+++ linux-2.6.21-rc7/mm/filemap.c	2007-04-19 09:16:45.000000000 -0700
@@ -121,6 +121,10 @@ void __remove_from_page_cache(struct pag
 	mapping->nrpages--;
 	__mod_zone_page_state(page_zone(page), NR_FILE_PAGES,
 			-(1 << mapping->order));
+
+	if (mapping->order)
+		printk(KERN_ERR "Removing page %p order %d from pagecache\n",
+				page, mapping->order);
 }
 
 void remove_from_page_cache(struct page *page)
@@ -451,6 +455,10 @@ int add_to_page_cache(struct page *page,
 			mapping->nrpages++;
 			__mod_zone_page_state(page_zone(page), NR_FILE_PAGES,
 					1 << mappig->order);
+
+			if (mapping->order)
+				printk(KERN_ERR "add_to_page_cache page %p order=%d\n",
+						page, mapping->order);
 		}
 		write_unlock_irq(&mapping->tree_lock);
 		radix_tree_preload_end();
-
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