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Commit bea3864f authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

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: default avatarMartin Steigerwald <Martin@Lichtvoll.de>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 40dc166c

kernel/power/snapshot.c

+4 −4
Original line number Diff line number Diff line
@@ -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