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PM / Hibernate: Reduce autotuned default image size 

The hibernate image size autotuning mechanism sets the default
image size to 5/2 of the total system RAM, but it is reported
that on some systems device drivers allocate substantial
amounts of memory during suspend and the creation of the image
fails as a result (too little memory is preallocated).

Modify the autotuning mechanism to use 1/3 instead of 2/5 of RAM
as the default image size, which is reported to be sufficient for
the affected systems.

References: https://bugzilla.kernel.org/show_bug.cgi?id=30482
Reported-and-tested-by: Martin Steigerwald <Martin@Lichtvoll.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2011-03-15 00:45:46 +01:00
parent 40dc166cb5
commit bea3864fb6
1 changed files with 4 additions and 4 deletions
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8
kernel/power/snapshot.c
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@ -42,15 +42,15 @@ static void swsusp_unset_page_forbidden(struct page *);
/*
* Preferred image size in bytes (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 bytes, but if that is impossible, it will
* try to create the smallest image possible.
* When it is set to N, the image creating code will do its best to
* ensure the image size will not exceed N bytes, but if that is
* impossible, it will try to create the smallest image possible.
*/
unsigned long image_size;
void __init hibernate_image_size_init(void)
{
image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
image_size = (totalram_pages / 3) * PAGE_SIZE;
}
/* List of PBEs needed for restoring the pages that were allocated before