android_kernel_motorola_sm6225/Documentation/power
Rafael J. Wysocki 8314418629 Freezer: make kernel threads nonfreezable by default
Currently, the freezer treats all tasks as freezable, except for the kernel
threads that explicitly set the PF_NOFREEZE flag for themselves.  This
approach is problematic, since it requires every kernel thread to either
set PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn't
care for the freezing of tasks at all.

It seems better to only require the kernel threads that want to or need to
be frozen to use some freezer-related code and to remove any
freezer-related code from the other (nonfreezable) kernel threads, which is
done in this patch.

The patch causes all kernel threads to be nonfreezable by default (ie.  to
have PF_NOFREEZE set by default) and introduces the set_freezable()
function that should be called by the freezable kernel threads in order to
unset PF_NOFREEZE.  It also makes all of the currently freezable kernel
threads call set_freezable(), so it shouldn't cause any (intentional)
change of behaviour to appear.  Additionally, it updates documentation to
describe the freezing of tasks more accurately.

[akpm@linux-foundation.org: build fixes]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00
..
basic-pm-debugging.txt Documentation: Ask driver writers to provide PM support 2007-05-08 11:14:59 -07:00
devices.txt updated Documentation/power/devices.txt 2006-09-25 21:08:37 -07:00
drivers-testing.txt Documentation: Ask driver writers to provide PM support 2007-05-08 11:14:59 -07:00
freezing-of-tasks.txt Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
interface.txt power management: change /sys/power/disk display 2007-05-07 12:12:59 -07:00
pci.txt PCI: remove useless pci driver method 2007-07-11 16:02:08 -07:00
s2ram.txt [PATCH] s2ram debugging documentation 2006-12-07 08:39:28 -08:00
states.txt power management: remove firmware disk mode 2007-04-30 16:40:40 -07:00
swsusp-and-swap-files.txt [PATCH] swsusp: update userland interface documentation 2006-12-07 08:39:27 -08:00
swsusp-dmcrypt.txt [PATCH] swsusup with dm-crypt mini howto 2005-09-05 00:06:17 -07:00
swsusp.txt Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
tricks.txt Fix typos in Documentation/: 'S' 2006-10-03 22:55:17 +02:00
userland-swsusp.txt PM: Separate hibernation code from suspend code 2007-05-09 12:30:48 -07:00
video.txt Fix typos in Documentation/: 'N'-'P' 2006-10-03 22:52:05 +02:00
video_extension.txt [PATCH] acpi: fix video docs 2005-06-25 16:24:32 -07:00