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Commit e64cd51d authored by Sergey Senozhatsky's avatar Sergey Senozhatsky Committed by Linus Torvalds
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zram: move zram size warning to documentation 



Move zram warning about disksize and size of memory correlation to zram
documentation.

Signed-off-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 59fc86a4

Documentation/blockdev/zram.txt

+5 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ Following shows a typical sequence of steps for using zram. 
            echo 512M > /sys/block/zram0/disksize

            echo 1G > /sys/block/zram0/disksize



Note:

There is little point creating a zram of greater than twice the size of memory

since we expect a 2:1 compression ratio. Note that zram uses about 0.1% of the

size of the disk when not in use so a huge zram is wasteful.



3) Activate:

	mkswap /dev/zram0

	swapon /dev/zram0

drivers/block/zram/zram_drv.c

+0 −15
Original line number Diff line number Diff line
@@ -535,23 +535,8 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity) 


static void zram_init_device(struct zram *zram, struct zram_meta *meta)

{

	if (zram->disksize > 2 * (totalram_pages << PAGE_SHIFT)) {

		pr_info(

		"There is little point creating a zram of greater than "

		"twice the size of memory since we expect a 2:1 compression "

		"ratio. Note that zram uses about 0.1%% of the size of "

		"the disk when not in use so a huge zram is "

		"wasteful.\n"

		"\tMemory Size: %lu kB\n"

		"\tSize you selected: %llu kB\n"

		"Continuing anyway ...\n",

		(totalram_pages << PAGE_SHIFT) >> 10, zram->disksize >> 10

		);

	}



	/* zram devices sort of resembles non-rotational disks */

	queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);



	zram->meta = meta;

	pr_debug("Initialization done!\n");

}