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[PATCH] swsusp: read speedup

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Implement async reads for swsusp resuming.

Crufty old PIII testbox:
	15.7 MB/s -> 20.3 MB/s

Sony Vaio:
	14.6 MB/s -> 33.3 MB/s

I didn't implement the post-resume bio_set_pages_dirty().  I don't really
understand why resume needs to run set_page_dirty() against these pages.

It might be a worry that this code modifies PG_Uptodate, PG_Error and
PG_Locked against the image pages.  Can this possibly affect the resumed-into
kernel?  Hopefully not, if we're atomically restoring its mem_map?

Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Jens Axboe <axboe@suse.de>
Cc: Laurent Riffard <laurent.riffard@free.fr>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton
2006-09-25 23:32:44 -07:00
committed by Linus Torvalds
parent 8c002494b5
commit 546e0d2719
5 changed files with 81 additions and 72 deletions
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1
include/linux/swap.h
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@@ -220,6 +220,7 @@ extern int swap_readpage(struct file *, struct page *);
extern int swap_writepage(struct page *page, struct writeback_control *wbc);
extern int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
struct bio **bio_chain);
extern int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err);
/* linux/mm/swap_state.c */
extern struct address_space swapper_space;