ia64/linux-2.6.18-xen.hg

view kernel/power/Kconfig @ 562:66faefe721eb

pvSCSI backend driver

Signed-off-by: Tomonari Horikoshi <t.horikoshi@jp.fujitsu.com>
Signed-off-by: Jun Kamada <kama@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Jun 02 09:58:27 2008 +0100 (2008-06-02)
parents 831230e53067
children
line source
1 config PM
2 bool "Power Management support"
3 depends on !IA64_HP_SIM
4 ---help---
5 "Power Management" means that parts of your computer are shut
6 off or put into a power conserving "sleep" mode if they are not
7 being used. There are two competing standards for doing this: APM
8 and ACPI. If you want to use either one, say Y here and then also
9 to the requisite support below.
11 Power Management is most important for battery powered laptop
12 computers; if you have a laptop, check out the Linux Laptop home
13 page on the WWW at <http://www.linux-on-laptops.com/> or
14 Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/>
15 and the Battery Powered Linux mini-HOWTO, available from
16 <http://www.tldp.org/docs.html#howto>.
18 Note that, even if you say N here, Linux on the x86 architecture
19 will issue the hlt instruction if nothing is to be done, thereby
20 sending the processor to sleep and saving power.
22 config PM_LEGACY
23 bool "Legacy Power Management API"
24 depends on PM
25 default y
26 ---help---
27 Support for pm_register() and friends.
29 If unsure, say Y.
31 config PM_DEBUG
32 bool "Power Management Debug Support"
33 depends on PM
34 ---help---
35 This option enables verbose debugging support in the Power Management
36 code. This is helpful when debugging and reporting various PM bugs,
37 like suspend support.
39 config PM_TRACE
40 bool "Suspend/resume event tracing"
41 depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL
42 default n
43 ---help---
44 This enables some cheesy code to save the last PM event point in the
45 RTC across reboots, so that you can debug a machine that just hangs
46 during suspend (or more commonly, during resume).
48 To use this debugging feature you should attempt to suspend the machine,
49 then reboot it, then run
51 dmesg -s 1000000 | grep 'hash matches'
53 CAUTION: this option will cause your machine's real-time clock to be
54 set to an invalid time after a resume.
57 config SOFTWARE_SUSPEND
58 bool "Software Suspend"
59 depends on PM && SWAP && ((X86 && (!SMP || SUSPEND_SMP) && !X86_PAE) || ((FRV || PPC32) && !SMP))
60 ---help---
61 Enable the possibility of suspending the machine.
62 It doesn't need ACPI or APM.
63 You may suspend your machine by 'swsusp' or 'shutdown -z <time>'
64 (patch for sysvinit needed).
66 It creates an image which is saved in your active swap. Upon next
67 boot, pass the 'resume=/dev/swappartition' argument to the kernel to
68 have it detect the saved image, restore memory state from it, and
69 continue to run as before. If you do not want the previous state to
70 be reloaded, then use the 'noresume' kernel argument. However, note
71 that your partitions will be fsck'd and you must re-mkswap your swap
72 partitions. It does not work with swap files.
74 Right now you may boot without resuming and then later resume but
75 in meantime you cannot use those swap partitions/files which were
76 involved in suspending. Also in this case there is a risk that buffers
77 on disk won't match with saved ones.
79 For more information take a look at <file:Documentation/power/swsusp.txt>.
81 (For now, swsusp is incompatible with PAE aka HIGHMEM_64G on i386.
82 we need identity mapping for resume to work, and that is trivial
83 to get with 4MB pages, but less than trivial on PAE).
85 config PM_STD_PARTITION
86 string "Default resume partition"
87 depends on SOFTWARE_SUSPEND
88 default ""
89 ---help---
90 The default resume partition is the partition that the suspend-
91 to-disk implementation will look for a suspended disk image.
93 The partition specified here will be different for almost every user.
94 It should be a valid swap partition (at least for now) that is turned
95 on before suspending.
97 The partition specified can be overridden by specifying:
99 resume=/dev/<other device>
101 which will set the resume partition to the device specified.
103 Note there is currently not a way to specify which device to save the
104 suspended image to. It will simply pick the first available swap
105 device.
107 config SUSPEND_SMP
108 bool
109 depends on HOTPLUG_CPU && X86 && PM
110 default y