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PM / Hibernate: Make default image size depend on total RAM size 

The default hibernation image size is currently hard coded and euqal
to 500 MB, which is not a reasonable default on many contemporary
systems.  Make it equal 2/5 of the total RAM size (this is slightly
below the maximum, i.e. 1/2 of the total RAM size, and seems to be
generally suitable).

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: M. Vefa Bicakci <bicave@superonline.com>
This commit is contained in:
Rafael J. Wysocki 2010-09-20 19:44:56 +02:00
parent 266f1a25ef
commit ac5c24ec1e
4 changed files with 16 additions and 3 deletions
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2
Documentation/power/interface.txt
View File

@ -57,7 +57,7 @@ smallest image possible. In particular, if "0" is written to this file, the
suspend image will be as small as possible.
Reading from this file will display the current image size limit, which
is set to 500 MB by default.
is set to 2/5 of available RAM by default.
/sys/power/pm_trace controls the code which saves the last PM event point in
the RTC across reboots, so that you can debug a machine that just hangs

1
kernel/power/main.c
View File

@ -321,6 +321,7 @@ static int __init pm_init(void)
int error = pm_start_workqueue();
if (error)
return error;
hibernate_image_size_init();
power_kobj = kobject_create_and_add("power", NULL);
if (!power_kobj)
return -ENOMEM;

9
kernel/power/power.h
View File

@ -14,6 +14,9 @@ struct swsusp_info {
} __attribute__((aligned(PAGE_SIZE)));
#ifdef CONFIG_HIBERNATION
/* kernel/power/snapshot.c */
extern void __init hibernate_image_size_init(void);
#ifdef CONFIG_ARCH_HIBERNATION_HEADER
/* Maximum size of architecture specific data in a hibernation header */
#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
@ -49,7 +52,11 @@ static inline char *check_image_kernel(struct swsusp_info *info)
extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);
#endif
#else /* !CONFIG_HIBERNATION */
static inline void hibernate_image_size_init(void) {}
#endif /* !CONFIG_HIBERNATION */
extern int pfn_is_nosave(unsigned long);

7
kernel/power/snapshot.c
View File

@ -46,7 +46,12 @@ static void swsusp_unset_page_forbidden(struct page *);
* size will not exceed N bytes, but if that is impossible, it will
* try to create the smallest image possible.
*/
unsigned long image_size = 500 * 1024 * 1024;
unsigned long image_size;
void __init hibernate_image_size_init(void)
{
image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
}
/* List of PBEs needed for restoring the pages that were allocated before
* the suspend and included in the suspend image, but have also been