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Sangwoo Park f0fe998465 zram: reduce load operation in page_same_filled 
In page_same_filled function, all elements in the page is compared with
next index value.  The current comparison routine compares the (i)th and
(i+1)th values of the page.

In this case, two load operaions occur for each comparison.  But if we
store first value of the page stores at 'val' variable and using it to
compare with others, the load opearation is reduced.  It reduce load
operation per page by up to 64times.

Link: http://lkml.kernel.org/r/1488428104-7257-1-git-send-email-sangwoo2.park@lge.com
Signed-off-by: Sangwoo Park <sangwoo2.park@lge.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2017-05-03 15:52:11 -07:00
..
aoe block: Use pointer to backing_dev_info from request_queue 2017-02-02 08:20:48 -07:00
drbd Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-05-02 16:40:27 -07:00
mtip32xx Merge branch 'for-4.12/block' of git://git.kernel.dk/linux-block 2017-05-01 10:39:57 -07:00
paride pd: don't check blk_execute_rq return value. 2017-04-20 12:16:10 -06:00
rsxx rsxx: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
xen-blkback xen: modify xenstore watch event interface 2017-02-09 11:26:49 -05:00
zram zram: reduce load operation in page_same_filled 2017-05-03 15:52:11 -07:00
DAC960.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
DAC960.h
…
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-05-02 19:09:35 -07:00
Makefile block: remove the osdblk driver 2017-04-19 09:10:51 -06:00
amiflop.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ataflop.c ataflop: switch from req->errors to req->error_count 2017-04-20 12:16:10 -06:00
brd.c brd: remove discard support 2017-04-08 11:25:38 -06:00
cciss.c scsi: introduce a result field in struct scsi_request 2017-04-20 12:16:10 -06:00
cciss.h SCSI misc on 20170220 2017-02-21 11:51:42 -08:00
cciss_cmd.h
…
cciss_scsi.c cciss: Remove kmalloc cast 2017-02-22 11:54:49 -07:00
cciss_scsi.h
…
cryptoloop.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
floppy.c floppy: switch from req->errors to req->error_count 2017-04-20 12:16:10 -06:00
loop.c blk-mq: remove the error argument to blk_mq_complete_request 2017-04-20 12:16:10 -06:00
loop.h loop: zero-fill bio on the submitting cpu 2017-04-20 12:16:10 -06:00
nbd.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2017-05-02 16:40:27 -07:00
null_blk.c blk-mq: remove the error argument to blk_mq_complete_request 2017-04-20 12:16:10 -06:00
pktcdvd.c scsi: introduce a result field in struct scsi_request 2017-04-20 12:16:10 -06:00
ps3disk.c block: fold cmd_type into the REQ_OP_ space 2017-01-31 14:00:44 -07:00
ps3vram.c block: convert to device_add_disk() 2016-06-27 12:26:08 -07:00
rbd.c rbd: remove the discard_zeroes_data flag 2017-04-08 11:25:38 -06:00
rbd_types.h rbd: RBD_V{1,2}_DATA_FORMAT macros 2017-02-20 12:16:15 +01:00
skd_main.c skd: implement trivial scsi ioctls directly 2017-01-31 10:53:03 -07:00
skd_s1120.h skd: fix formatting in skd_s1120.h 2013-11-08 09:10:30 -07:00
smart1,2.h
…
sunvdc.c sunvdc: Add support for setting physical sector size 2017-02-23 08:24:08 -08:00
swim.c swim: stop sharing request queue across multiple gendisks 2017-03-28 15:06:58 -06:00
swim3.c swim3: remove (commented out) printing of req->errors 2017-04-20 12:16:10 -06:00
swim_asm.S
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sx8.c block: fold cmd_type into the REQ_OP_ space 2017-01-31 14:00:44 -07:00
umem.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
umem.h
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virtio_blk.c blk-mq: remove the error argument to blk_mq_complete_request 2017-04-20 12:16:10 -06:00
xen-blkfront.c blk-mq: remove the error argument to blk_mq_complete_request 2017-04-20 12:16:10 -06:00
xsysace.c block: fold cmd_type into the REQ_OP_ space 2017-01-31 14:00:44 -07:00
z2ram.c block: remove struct request buffer member 2014-04-15 14:03:02 -06:00