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authorSangwoo Park <sangwoo2.park@lge.com>2017-05-03 23:55:56 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-04 00:52:11 +0200
commitf0fe9984656604ea8effd5ff82709ff8ce1f954b (patch)
tree8b2998a6041eb33b592ed10abd551a7a29fc43b6 /mm/sparse-vmemmap.c
parentzram: use zram_free_page instead of open-coded (diff)
downloadlinux-f0fe9984656604ea8effd5ff82709ff8ce1f954b.tar.xz
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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>
Diffstat (limited to 'mm/sparse-vmemmap.c')
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