linux-kernel - Frontswap [PATCH 1/4] (was Transcendent Memory): swap data structure changes

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Message-ID: <20100422134309.GA2994@ca-server1.us.oracle.com>
Date:	Thu, 22 Apr 2010 06:43:09 -0700
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org,
	hugh.dickins@...cali.co.uk, ngupta@...are.org, JBeulich@...ell.com,
	chris.mason@...cle.com, kurt.hackel@...cle.com,
	dave.mccracken@...cle.com, npiggin@...e.de,
	akpm@...ux-foundation.org, riel@...hat.com
Subject: Frontswap [PATCH 1/4] (was Transcendent Memory): swap data
	structure changes

Frontswap [PATCH 1/4] (was Transcendent Memory): swap data structure changes

Core swap data structures are needed by frontswap.c but we don't
need to expose them to the dozens of files that include swap.h
so create a new swapfile.h just to extern-ify these.

Add frontswap-related elements to swap_info_struct.  Don't tie
these to CONFIG_FRONTSWAP to avoid unnecessary clutter around
various frontswap hooks.

Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>

Diffstat:
 swap.h                                   |    2 ++
 swapfile.h                               |   13 +++++++++++++
 2 files changed, 15 insertions(+)

--- linux-2.6.34-rc5/include/linux/swapfile.h	1969-12-31 17:00:00.000000000 -0700
+++ linux-2.6.34-rc5-frontswap/include/linux/swapfile.h	2010-04-21 08:59:36.000000000 -0600
@@ -0,0 +1,13 @@
+#ifndef _LINUX_SWAPFILE_H
+#define _LINUX_SWAPFILE_H
+
+/*
+ * these were static in swapfile.c but frontswap.c needs them and we don't
+ * want to expose them to the dozens of source files that include swap.h
+ */
+extern spinlock_t swap_lock;
+extern struct swap_list_t swap_list;
+extern struct swap_info_struct *swap_info[];
+extern int try_to_unuse(unsigned int, bool, unsigned long);
+
+#endif /* _LINUX_SWAPFILE_H */
--- linux-2.6.34-rc5/include/linux/swap.h	2010-04-19 17:29:56.000000000 -0600
+++ linux-2.6.34-rc5-frontswap/include/linux/swap.h	2010-04-21 08:59:36.000000000 -0600
@@ -182,6 +182,8 @@ struct swap_info_struct {
 	struct block_device *bdev;	/* swap device or bdev of swap file */
 	struct file *swap_file;		/* seldom referenced */
 	unsigned int old_block_size;	/* seldom referenced */
+	unsigned long *frontswap_map;	/* frontswap in-use, one bit per page */
+	unsigned int frontswap_pages;	/* frontswap pages in-use counter */
 };
 
 struct swap_list_t {
--
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