aha/kernel/power
Nick Piggin b5810039a5 [PATCH] core remove PageReserved
Remove PageReserved() calls from core code by tightening VM_RESERVED
handling in mm/ to cover PageReserved functionality.

PageReserved special casing is removed from get_page and put_page.

All setting and clearing of PageReserved is retained, and it is now flagged
in the page_alloc checks to help ensure we don't introduce any refcount
based freeing of Reserved pages.

MAP_PRIVATE, PROT_WRITE of VM_RESERVED regions is tentatively being
deprecated.  We never completely handled it correctly anyway, and is be
reintroduced in future if required (Hugh has a proof of concept).

Once PageReserved() calls are removed from kernel/power/swsusp.c, and all
arch/ and driver code, the Set and Clear calls, and the PG_reserved bit can
be trivially removed.

Last real user of PageReserved is swsusp, which uses PageReserved to
determine whether a struct page points to valid memory or not.  This still
needs to be addressed (a generic page_is_ram() should work).

A last caveat: the ZERO_PAGE is now refcounted and managed with rmap (and
thus mapcounted and count towards shared rss).  These writes to the struct
page could cause excessive cacheline bouncing on big systems.  There are a
number of ways this could be addressed if it is an issue.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Refcount bug fix for filemap_xip.c

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29 21:40:39 -07:00
..
console.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
disk.c [PATCH] suspend: cleanup calling of power off methods. 2005-09-22 22:17:33 -07:00
Kconfig [PATCH] SOFTWARE_SUSPEND needs HOTPLUG_CPU on SMP 2005-09-22 22:17:34 -07:00
main.c [PATCH] pm: clean up /sys/power/disk 2005-09-05 00:06:18 -07:00
Makefile [PATCH] suspend/resume SMP support 2005-06-25 16:24:32 -07:00
pm.c [PATCH] introduce and use kzalloc 2005-09-07 16:57:45 -07:00
power.h [PATCH] swsusp: avoid problems if there are too many pages to save 2005-09-28 07:46:41 -07:00
poweroff.c [PATCH] Use kernel_power_off in sysrq-o 2005-07-26 14:35:43 -07:00
process.c [PATCH] pm: fix process freezing 2005-09-05 00:06:17 -07:00
smp.c [PATCH] Address BUG: using smp_processor_id() in preemptible [00000001] code 2005-07-27 16:25:50 -07:00
swsusp.c [PATCH] core remove PageReserved 2005-10-29 21:40:39 -07:00