Commit f996fc96 authored by Bojan Smojver's avatar Bojan Smojver Committed by Rafael J. Wysocki
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PM / Hibernate: Compress hibernation image with LZO 



Compress hibernation image with LZO in order to save on I/O and
therefore time to hibernate/thaw.

[rjw: Added hibernate=nocompress command line option instead of just
 nocompress which would be confusing, fixed a couple of compiler
 warnings, fixed kerneldoc comments, minor cleanups.]

Signed-off-by: default avatarBojan Smojver <bojan@rexursive.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 05aa55dd

Documentation/kernel-parameters.txt

+5 −0
Original line number Diff line number Diff line
@@ -2165,6 +2165,11 @@ and is between 256 and 4096 characters. It is defined in the file 
			in <PAGE_SIZE> units (needed only for swap files).

			See  Documentation/power/swsusp-and-swap-files.txt



	hibernate=	[HIBERNATION]

		noresume	Don't check if there's a hibernation image

				present during boot.

		nocompress	Don't compress/decompress hibernation images.



	retain_initrd	[RAM] Keep initrd memory after extraction



	rhash_entries=	[KNL,NET]

Documentation/power/swsusp.txt

+2 −1
Original line number Diff line number Diff line
@@ -66,7 +66,8 @@ swsusp saves the state of the machine into active swaps and then reboots or 
powerdowns.  You must explicitly specify the swap partition to resume from with

``resume='' kernel option. If signature is found it loads and restores saved

state. If the option ``noresume'' is specified as a boot parameter, it skips

the resuming.

the resuming.  If the option ``hibernate=nocompress'' is specified as a boot

parameter, it saves hibernation image without compression.



In the meantime while the system is suspended you should not add/remove any

of the hardware, write to the filesystems, etc.

kernel/power/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -137,6 +137,8 @@ config SUSPEND_FREEZER 
config HIBERNATION

	bool "Hibernation (aka 'suspend to disk')"

	depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE

	select LZO_COMPRESS

	select LZO_DECOMPRESS

	select SUSPEND_NVS if HAS_IOMEM

	---help---

	  Enable the suspend to disk (STD) functionality, which is usually

kernel/power/hibernate.c

+13 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
#include "power.h"





static int nocompress = 0;

static int noresume = 0;

static char resume_file[256] = CONFIG_PM_STD_PARTITION;

dev_t swsusp_resume_device;
@@ -638,6 +639,8 @@ int hibernate(void) 


		if (hibernation_mode == HIBERNATION_PLATFORM)

			flags |= SF_PLATFORM_MODE;

		if (nocompress)

			flags |= SF_NOCOMPRESS_MODE;

		pr_debug("PM: writing image.\n");

		error = swsusp_write(flags);

		swsusp_free();
@@ -1004,6 +1007,15 @@ static int __init resume_offset_setup(char *str) 
	return 1;

}



static int __init hibernate_setup(char *str)

{

	if (!strncmp(str, "noresume", 8))

		noresume = 1;

	else if (!strncmp(str, "nocompress", 10))

		nocompress = 1;

	return 1;

}



static int __init noresume_setup(char *str)

{

	noresume = 1;
@@ -1013,3 +1025,4 @@ static int __init noresume_setup(char *str) 
__setup("noresume", noresume_setup);

__setup("resume_offset=", resume_offset_setup);

__setup("resume=", resume_setup);

__setup("hibernate=", hibernate_setup);

kernel/power/power.h

+1 −0
Original line number Diff line number Diff line
@@ -134,6 +134,7 @@ extern int swsusp_swap_in_use(void); 
 * the image header.

 */

#define SF_PLATFORM_MODE	1

#define SF_NOCOMPRESS_MODE	2



/* kernel/power/hibernate.c */

extern int swsusp_check(void);

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