Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [PATCH] PM / Hibernate: Reduce autotuned default image size | Date | Tue, 15 Mar 2011 00:42:23 +0100 |
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From: Rafael J. Wysocki <rjw@sisk.pl>
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> --- kernel/power/snapshot.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
Index: linux-2.6/kernel/power/snapshot.c =================================================================== --- linux-2.6.orig/kernel/power/snapshot.c +++ linux-2.6/kernel/power/snapshot.c @@ -42,15 +42,15 @@ static void swsusp_unset_page_forbidden( /* * 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
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