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PM / Hibernate: Compress hibernation image with LZO

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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: Bojan Smojver <bojan@rexursive.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Bojan Smojver
2010-09-09 23:06:23 +02:00
committed by Rafael J. Wysocki
parent 05aa55dddb
commit f996fc9671
6 changed files with 306 additions and 8 deletions
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13
kernel/power/hibernate.c
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@@ -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);