Commit ddeb6487 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / Hibernate: Add sysfs knob to control size of memory for drivers 

Martin reports that on his system hibernation occasionally fails due
to the lack of memory, because the radeon driver apparently allocates
too much of it during the device freeze stage.  It turns out that the
amount of memory allocated by radeon during hibernation (and
presumably during system suspend too) depends on the utilization of
the GPU (e.g. hibernating while there are two KDE 4 sessions with
compositing enabled causes radeon to allocate more memory than for
one KDE 4 session).

In principle it should be possible to use image_size to make the
memory preallocation mechanism free enough memory for the radeon
driver, but in practice it is not easy to guess the right value
because of the way the preallocation code uses image_size.  For this
reason, it seems reasonable to allow users to control the amount of
memory reserved for driver allocations made after the hibernate
preallocation, which currently is constant and amounts to 1 MB.

Introduce a new sysfs file, /sys/power/reserved_size, whose value
will be used as the amount of memory to reserve for the
post-preallocation reservations made by device drivers, in bytes.
For backwards compatibility, set its default (and initial) value to
the currently used number (1 MB).

References: https://bugzilla.kernel.org/show_bug.cgi?id=34102


Reported-and-tested-by: default avatarMartin Steigerwald <Martin@Lichtvoll.de>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 13e38136

Documentation/ABI/testing/sysfs-power

+14 −0
Original line number Diff line number Diff line
@@ -158,3 +158,17 @@ Description: 
		successful, will make the kernel abort a subsequent transition

		to a sleep state if any wakeup events are reported after the

		write has returned.



What:		/sys/power/reserved_size

Date:		May 2011

Contact:	Rafael J. Wysocki <rjw@sisk.pl>

Description:

		The /sys/power/reserved_size file allows user space to control

		the amount of memory reserved for allocations made by device

		drivers during the "device freeze" stage of hibernation.  It can

		be written a string representing a non-negative integer that

		will be used as the amount of memory to reserve for allocations

		made by device drivers' "freeze" callbacks, in bytes.



		Reading from this file will display the current value, which is

		set to 1 MB by default.

kernel/power/hibernate.c

+23 −0
Original line number Diff line number Diff line
@@ -982,10 +982,33 @@ static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *att 


power_attr(image_size);



static ssize_t reserved_size_show(struct kobject *kobj,

				  struct kobj_attribute *attr, char *buf)

{

	return sprintf(buf, "%lu\n", reserved_size);

}



static ssize_t reserved_size_store(struct kobject *kobj,

				   struct kobj_attribute *attr,

				   const char *buf, size_t n)

{

	unsigned long size;



	if (sscanf(buf, "%lu", &size) == 1) {

		reserved_size = size;

		return n;

	}



	return -EINVAL;

}



power_attr(reserved_size);



static struct attribute * g[] = {

	&disk_attr.attr,

	&resume_attr.attr,

	&image_size_attr.attr,

	&reserved_size_attr.attr,

	NULL,

};

kernel/power/main.c

+1 −0
Original line number Diff line number Diff line
@@ -337,6 +337,7 @@ static int __init pm_init(void) 
	if (error)

		return error;

	hibernate_image_size_init();

	hibernate_reserved_size_init();

	power_kobj = kobject_create_and_add("power", NULL);

	if (!power_kobj)

		return -ENOMEM;

kernel/power/power.h

+4 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ struct swsusp_info { 


#ifdef CONFIG_HIBERNATION

/* kernel/power/snapshot.c */

extern void __init hibernate_reserved_size_init(void);

extern void __init hibernate_image_size_init(void);



#ifdef CONFIG_ARCH_HIBERNATION_HEADER
@@ -55,6 +56,7 @@ extern int hibernation_platform_enter(void); 


#else /* !CONFIG_HIBERNATION */



static inline void hibernate_reserved_size_init(void) {}

static inline void hibernate_image_size_init(void) {}

#endif /* !CONFIG_HIBERNATION */
@@ -72,6 +74,8 @@ static struct kobj_attribute _name##_attr = { \ 


/* Preferred image size in bytes (default 500 MB) */

extern unsigned long image_size;

/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */

extern unsigned long reserved_size;

extern int in_suspend;

extern dev_t swsusp_resume_device;

extern sector_t swsusp_resume_block;

kernel/power/snapshot.c

+20 −5
Original line number Diff line number Diff line
@@ -40,6 +40,18 @@ static int swsusp_page_is_free(struct page *); 
static void swsusp_set_page_forbidden(struct page *);

static void swsusp_unset_page_forbidden(struct page *);



/*

 * Number of bytes to reserve for memory allocations made by device drivers

 * from their ->freeze() and ->freeze_noirq() callbacks so that they don't

 * cause image creation to fail (tunable via /sys/power/reserved_size).

 */

unsigned long reserved_size;



void __init hibernate_reserved_size_init(void)

{

	reserved_size = SPARE_PAGES * PAGE_SIZE;

}



/*

 * Preferred image size in bytes (tunable via /sys/power/image_size).

 * When it is set to N, the image creating code will do its best to
@@ -1263,11 +1275,13 @@ static unsigned long minimum_image_size(unsigned long saveable) 
 * frame in use.  We also need a number of page frames to be free during

 * hibernation for allocations made while saving the image and for device

 * drivers, in case they need to allocate memory from their hibernation

 * callbacks (these two numbers are given by PAGES_FOR_IO and SPARE_PAGES,

 * respectively, both of which are rough estimates).  To make this happen, we

 * compute the total number of available page frames and allocate at least

 * callbacks (these two numbers are given by PAGES_FOR_IO (which is a rough

 * estimate) and reserverd_size divided by PAGE_SIZE (which is tunable through

 * /sys/power/reserved_size, respectively).  To make this happen, we compute the

 * total number of available page frames and allocate at least

 *

 * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2 + 2 * SPARE_PAGES

 * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2

 *  + 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE)

 *

 * of them, which corresponds to the maximum size of a hibernation image.

 *
@@ -1322,7 +1336,8 @@ int hibernate_preallocate_memory(void) 
	count -= totalreserve_pages;



	/* Compute the maximum number of saveable pages to leave in memory. */

	max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;

	max_size = (count - (size + PAGES_FOR_IO)) / 2

			- 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE);

	/* Compute the desired number of image pages specified by image_size. */

	size = DIV_ROUND_UP(image_size, PAGE_SIZE);

	if (size > max_size)

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