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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: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Bojan Smojver 2011-10-13 23:58:07 +02:00 committed by Rafael J. Wysocki
parent d231ff1af7
commit 081a9d043c
4 changed files with 651 additions and 184 deletions
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1
kernel/power/Kconfig
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@ -27,6 +27,7 @@ config HIBERNATION
select HIBERNATE_CALLBACKS select HIBERNATE_CALLBACKS
select LZO_COMPRESS select LZO_COMPRESS
select LZO_DECOMPRESS select LZO_DECOMPRESS
select CRC32
---help--- ---help---
Enable the suspend to disk (STD) functionality, which is usually Enable the suspend to disk (STD) functionality, which is usually
called "hibernation" in user interfaces. STD checkpoints the called "hibernation" in user interfaces. STD checkpoints the

3
kernel/power/hibernate.c
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@ -657,6 +657,9 @@ int hibernate(void)
flags |= SF_PLATFORM_MODE; flags |= SF_PLATFORM_MODE;
if (nocompress) if (nocompress)
flags |= SF_NOCOMPRESS_MODE; flags |= SF_NOCOMPRESS_MODE;
else
flags |= SF_CRC32_MODE;
pr_debug("PM: writing image.\n"); pr_debug("PM: writing image.\n");
error = swsusp_write(flags); error = swsusp_write(flags);
swsusp_free(); swsusp_free();

1
kernel/power/power.h
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@ -146,6 +146,7 @@ extern int swsusp_swap_in_use(void);
*/ */
#define SF_PLATFORM_MODE 1 #define SF_PLATFORM_MODE 1
#define SF_NOCOMPRESS_MODE 2 #define SF_NOCOMPRESS_MODE 2
#define SF_CRC32_MODE 4
/* kernel/power/hibernate.c */ /* kernel/power/hibernate.c */
extern int swsusp_check(void); extern int swsusp_check(void);

830
kernel/power/swap.c
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