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

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aoe

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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

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zram

zram: reduce load operation in page_same_filled

2017-05-03 15:52:11 -07:00

amiflop.c

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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_cmd.h

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cciss_scsi.c

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cciss_scsi.h

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cciss.c

scsi: introduce a result field in struct scsi_request

2017-04-20 12:16:10 -06:00

cciss.h

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cryptoloop.c

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DAC960.c

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DAC960.h

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floppy.c

floppy: switch from req->errors to req->error_count

2017-04-20 12:16:10 -06:00

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

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

Makefile

block: remove the osdblk driver

2017-04-19 09:10:51 -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

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ps3vram.c

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rbd_types.h

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rbd.c

rbd: remove the discard_zeroes_data flag

2017-04-08 11:25:38 -06:00

skd_main.c

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skd_s1120.h

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smart1,2.h

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sunvdc.c

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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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swim.c

swim: stop sharing request queue across multiple gendisks

2017-03-28 15:06:58 -06:00

sx8.c

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umem.c

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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

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z2ram.c

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