PM / Hibernate: Reduce autotuned default image size (bea3864f) · Commits · 戴 / test

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

+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

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