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Date: Mon, 29 Aug 2011 09:48:48 -0700
From: Dan Magenheimer <dan.magenheimer@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org,
hughd@...gle.com, ngupta@...are.org, konrad.wilk@...cle.com,
JBeulich@...ell.com, kurt.hackel@...cle.com, npiggin@...nel.dk,
akpm@...ux-foundation.org, riel@...hat.com, hannes@...xchg.org,
matthew@....cx, chris.mason@...cle.com, dan.magenheimer@...cle.com,
sjenning@...ux.vnet.ibm.com, kamezawa.hiroyu@...fujitsu.com,
jackdachef@...il.com, cyclonusj@...il.com, levinsasha928@...il.com
Subject: [PATCH V8 1/4] mm: frontswap: swap data structure changes
From: Dan Magenheimer <dan.magenheimer@...cle.com>
Subject: [PATCH V8 1/4] mm: frontswap: swap data structure changes
This first patch of four in the frontswap series makes available core
swap data structures (swap_lock, swap_list and swap_info) that are
needed by frontswap.c but we don't need to expose them to the dozens
of files that include swap.h so we create a new swapfile.h just to
extern-ify these.
Also add frontswap-related elements to swap_info_struct. Frontswap_map
points to vzalloc'ed one-bit-per-swap-page metadata that indicates
whether the swap page is in frontswap or in the device and frontswap_pages
counts how many pages are in frontswap.
[v8: rebase to 3.0-rc4]
[v8: kamezawa.hiroyu@...fujitsu.com: frontswap_pages should be atomic_t]
[v8: kamezawa.hiroyu@...fujitsu.com: comment to clarify informational counters]
[v7: rebase to 3.0-rc3]
[v7: JBeulich@...ell.com: add new swap struct elements only if config'd]
[v6: rebase to 3.0-rc1]
[v5: no change from v4]
[v4: rebase to 2.6.39]
Signed-off-by: Dan Magenheimer <dan.magenheimer@...cle.com>
Reviewed-by: Konrad Wilk <konrad.wilk@...cle.com>
Reviewed-by: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Acked-by: Jan Beulich <JBeulich@...ell.com>
Acked-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Nitin Gupta <ngupta@...are.org>
Cc: Matthew Wilcox <matthew@....cx>
Cc: Chris Mason <chris.mason@...cle.com>
Cc: Rik Riel <riel@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
--- linux/include/linux/swapfile.h 1969-12-31 17:00:00.000000000 -0700
+++ frontswap/include/linux/swapfile.h 2011-08-29 09:52:14.305755924 -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/include/linux/swap.h 2011-08-08 08:19:25.880690134 -0600
+++ frontswap/include/linux/swap.h 2011-08-29 10:02:53.152685666 -0600
@@ -194,6 +194,10 @@ 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 */
+#ifdef CONFIG_FRONTSWAP
+ unsigned long *frontswap_map; /* frontswap in-use, one bit per page */
+ atomic_t frontswap_pages; /* frontswap pages in-use counter */
+#endif
};
struct swap_list_t {
--
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