Commit 081a9d04 authored by Bojan Smojver's avatar Bojan Smojver Committed by Rafael J. Wysocki
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PM / Hibernate: Improve performance of LZO/plain hibernation, checksum image 



Use threads for LZO compression/decompression on hibernate/thaw.
Improve buffering on hibernate/thaw.
Calculate/verify CRC32 of the image pages on hibernate/thaw.

In my testing, this improved write/read speed by a factor of about two.

Signed-off-by: default avatarBojan Smojver <bojan@rexursive.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent d231ff1a

kernel/power/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ config HIBERNATION 
	select HIBERNATE_CALLBACKS

	select LZO_COMPRESS

	select LZO_DECOMPRESS

	select CRC32

	---help---

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

	  called "hibernation" in user interfaces.  STD checkpoints the

kernel/power/hibernate.c

+3 −0
Original line number Diff line number Diff line
@@ -657,6 +657,9 @@ int hibernate(void) 
			flags |= SF_PLATFORM_MODE;

		if (nocompress)

			flags |= SF_NOCOMPRESS_MODE;

		else

		        flags |= SF_CRC32_MODE;



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

		error = swsusp_write(flags);

		swsusp_free();

kernel/power/power.h

+1 −0
Original line number Diff line number Diff line
@@ -146,6 +146,7 @@ extern int swsusp_swap_in_use(void); 
 */

#define SF_PLATFORM_MODE	1

#define SF_NOCOMPRESS_MODE	2

#define SF_CRC32_MODE	        4



/* kernel/power/hibernate.c */

extern int swsusp_check(void);

kernel/power/swap.c

+640 −178

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