ca0aec0f7a
Make the suspend image size limit tunable via /sys/power/image_size. It is necessary for systems on which there is a limited amount of swap available for suspend. It can also be useful for optimizing performance of swsusp on systems with 1 GB of RAM or more. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
#include <linux/suspend.h>
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#include <linux/utsname.h>
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/* With SUSPEND_CONSOLE defined suspend looks *really* cool, but
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we probably do not take enough locks for switching consoles, etc,
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so bad things might happen.
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*/
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#if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
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#define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
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#endif
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struct swsusp_info {
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struct new_utsname uts;
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u32 version_code;
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unsigned long num_physpages;
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int cpus;
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unsigned long image_pages;
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unsigned long pages;
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swp_entry_t start;
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} __attribute__((aligned(PAGE_SIZE)));
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#ifdef CONFIG_SOFTWARE_SUSPEND
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extern int pm_suspend_disk(void);
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#else
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static inline int pm_suspend_disk(void)
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{
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return -EPERM;
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}
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#endif
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extern struct semaphore pm_sem;
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#define power_attr(_name) \
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static struct subsys_attribute _name##_attr = { \
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.attr = { \
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.name = __stringify(_name), \
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.mode = 0644, \
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}, \
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.show = _name##_show, \
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.store = _name##_store, \
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}
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extern struct subsystem power_subsys;
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extern int pm_prepare_console(void);
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extern void pm_restore_console(void);
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/* References to section boundaries */
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extern const void __nosave_begin, __nosave_end;
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extern unsigned int nr_copy_pages;
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extern struct pbe *pagedir_nosave;
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/* Preferred image size in MB (default 500) */
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extern unsigned int image_size;
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extern asmlinkage int swsusp_arch_suspend(void);
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extern asmlinkage int swsusp_arch_resume(void);
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extern unsigned int count_data_pages(void);
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extern void free_pagedir(struct pbe *pblist);
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extern void release_eaten_pages(void);
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extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed);
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extern void swsusp_free(void);
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extern int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed);
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extern unsigned int snapshot_nr_pages(void);
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extern struct pbe *snapshot_pblist(void);
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extern void snapshot_pblist_set(struct pbe *pblist);
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