diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/disk.c | 20 | ||||
| -rw-r--r-- | kernel/power/power.h | 7 | ||||
| -rw-r--r-- | kernel/power/swsusp.c | 10 |
3 files changed, 31 insertions, 6 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c index 9e51cdf7b78..e24446f8d8c 100644 --- a/kernel/power/disk.c +++ b/kernel/power/disk.c @@ -365,9 +365,29 @@ out: power_attr(resume); +static ssize_t image_size_show(struct subsystem * subsys, char *buf) +{ + return sprintf(buf, "%u\n", image_size); +} + +static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n) +{ + unsigned int size; + + if (sscanf(buf, "%u", &size) == 1) { + image_size = size; + return n; + } + + return -EINVAL; +} + +power_attr(image_size); + static struct attribute * g[] = { &disk_attr.attr, &resume_attr.attr, + &image_size_attr.attr, NULL, }; diff --git a/kernel/power/power.h b/kernel/power/power.h index 9b045990361..273a5b1d70b 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -52,11 +52,8 @@ extern const void __nosave_begin, __nosave_end; extern unsigned int nr_copy_pages; extern struct pbe *pagedir_nosave; -/* - * Preferred image size in MB (set it to zero to get the smallest - * image possible) - */ -#define IMAGE_SIZE 500 +/* Preferred image size in MB (default 500) */ +extern unsigned int image_size; extern asmlinkage int swsusp_arch_suspend(void); extern asmlinkage int swsusp_arch_resume(void); diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c index 6d5ceaf4c36..d760a6a719f 100644 --- a/kernel/power/swsusp.c +++ b/kernel/power/swsusp.c @@ -69,6 +69,14 @@ #include "power.h" +/* + * Preferred image size in MB (tunable via /sys/power/image_size). + * When it is set to N, swsusp will do its best to ensure the image + * size will not exceed N MB, but if that is impossible, it will + * try to create the smallest image possible. + */ +unsigned int image_size = 500; + #ifdef CONFIG_HIGHMEM unsigned int count_highmem_pages(void); int save_highmem(void); @@ -647,7 +655,7 @@ int swsusp_shrink_memory(void) if (!tmp) return -ENOMEM; pages += tmp; - } else if (size > (IMAGE_SIZE * 1024 * 1024) / PAGE_SIZE) { + } else if (size > (image_size * 1024 * 1024) / PAGE_SIZE) { tmp = shrink_all_memory(SHRINK_BITE); pages += tmp; } |