Rafael J. Wysocki b788db7989 [PATCH] swsusp: Introduce memory bitmaps ... Introduce the memory bitmap data structure and make swsusp use in the suspend phase. The current swsusp's internal data structure is not very efficient from the memory usage point of view, so it seems reasonable to replace it with a data structure that will require less memory, such as a pair of bitmaps. The idea is to use bitmaps that may be allocated as sets of individual pages, so that we can avoid making allocations of order greater than 0. For this reason the memory bitmap structure consists of several linked lists of objects that contain pointers to memory pages with the actual bitmap data. Still, for a typical system all of these lists fit in a single page, so it's reasonable to introduce an additional mechanism allowing us to allocate all of them efficiently without sacrificing the generality of the design. This is done with the help of the chain_allocator structure and associated functions. We need to use two memory bitmaps during the suspend phase of the suspend-resume cycle. One of them is necessary for marking the saveable pages, and the second is used to mark the pages in which to store the copies of them (aka image pages). First, the bitmaps are created and we allocate as many image pages as needed (the corresponding bits in the second bitmap are set as soon as the pages are allocated). Second, the bits corresponding to the saveable pages are set in the first bitmap and the saveable pages are copied to the image pages. Finally, the first bitmap is used to save the kernel virtual addresses of the saveable pages and the second one is used to save the contents of the image pages. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-09-26 08:49:02 -07:00
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console.c	[PATCH] Fix build failure in recent pm_prepare_* changes.	2006-02-07 16:12:33 -08:00
disk.c	[PATCH] Disable CPU hotplug during suspend	2006-09-26 08:48:59 -07:00
Kconfig	[PATCH] prevent swsusp with PAE	2006-09-06 11:00:02 -07:00
main.c	[PATCH] Disable CPU hotplug during suspend	2006-09-26 08:48:59 -07:00
Makefile	[PATCH] Disable CPU hotplug during suspend	2006-09-26 08:48:59 -07:00
pm.c	[PATCH] remove kernel/power/pm.c:pm_unregister_all()	2006-07-12 16:09:08 -07:00
power.h	[PATCH] swsusp: Introduce memory bitmaps	2006-09-26 08:49:02 -07:00
poweroff.c	[PATCH] Use kernel_power_off in sysrq-o	2005-07-26 14:35:43 -07:00
process.c	[PATCH] Make suspend possible with a traced process at a breakpoint	2006-08-06 08:57:45 -07:00
snapshot.c	[PATCH] swsusp: Introduce memory bitmaps	2006-09-26 08:49:02 -07:00
swap.c	[PATCH] swsusp: read speedup	2006-09-26 08:48:58 -07:00
swsusp.c	[PATCH] swsusp: Introduce memory bitmaps	2006-09-26 08:49:02 -07:00
user.c	[PATCH] Disable CPU hotplug during suspend	2006-09-26 08:48:59 -07:00