From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
To: linux-mm <linux-mm@kvack.org>
Subject: [RFC:PATCH 06/07] For readahead, leave data in tail
Date: Wed, 29 Aug 2007 16:54:00 -0400 [thread overview]
Message-ID: <20070829205359.28328.89933.sendpatchset@norville.austin.ibm.com> (raw)
In-Reply-To: <20070829205325.28328.67953.sendpatchset@norville.austin.ibm.com>
For readahead, leave data in tail
Don't unpack it until it's actually read.
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
---
mm/readahead.c | 5 +++++
1 file changed, 5 insertions(+)
diff -Nurp linux005/mm/readahead.c linux006/mm/readahead.c
--- linux005/mm/readahead.c 2007-08-28 09:57:20.000000000 -0500
+++ linux006/mm/readahead.c 2007-08-29 13:27:46.000000000 -0500
@@ -15,6 +15,7 @@
#include <linux/backing-dev.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/pagevec.h>
+#include <linux/vm_file_tail.h>
void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
@@ -163,6 +164,10 @@ __do_page_cache_readahead(struct address
if (page_offset > end_index)
break;
+ if ((page_offset == end_index) && vm_file_tail_packed(mapping))
+ /* Tail page is already packed */
+ break;
+
page = radix_tree_lookup(&mapping->page_tree, page_offset);
if (page)
continue;
--
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next prev parent reply other threads:[~2007-08-29 20:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-29 20:53 [RFC:PATCH 00/07] VM File Tails Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 01/07] Add tail to address space Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 02/07] Core function for packing, unpacking, and freeing file tails Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 03/07] Release tail when inode is freed Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 04/07] Unpack or remove file tail when inode is resized Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 05/07] find_get_page() and find_lock_page() need to unpack the tail Dave Kleikamp
2007-08-29 20:54 ` Dave Kleikamp [this message]
2007-08-29 20:54 ` [RFC:PATCH 07/07] shrink_active_list: pack file tails rather than move to inactive list Dave Kleikamp
2007-08-29 21:31 ` [RFC:PATCH 00/07] VM File Tails Jörn Engel
2007-08-29 21:45 ` Dave Kleikamp
2007-08-29 23:38 ` Jörn Engel
2007-08-30 2:15 ` Dave Kleikamp
2007-08-30 10:11 ` Jörn Engel
2007-08-31 21:00 ` Luiz Fernando N. Capitulino
2007-08-31 21:47 ` Dave Kleikamp
2007-09-03 21:09 ` Luiz Fernando N. Capitulino
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