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drivers/block/zram/zram_drv.c: convert to using memset_l

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zram was the motivation for creating memset_l().  Minchan Kim sees a 7%
performance improvement on x86 with 100MB of non-zero deduplicatable
data:

        perf stat -r 10 dd if=/dev/zram0 of=/dev/null

vanilla:        0.232050465 seconds time elapsed ( +-  0.51% )
memset_l:	0.217219387 seconds time elapsed ( +-  0.07% )

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox <[email protected]>
Tested-by: Minchan Kim <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: "James E.J. Bottomley" <[email protected]>
Cc: "Martin K. Petersen" <[email protected]>
Cc: David Miller <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: Matt Turner <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Russell King <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Matthew Wilcox 2017-09-08 16:14:07 -07:00 • committed by Linus Torvalds
commit 48ad1abef4
1 changed files with 2 additions and 11 deletions
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13
drivers/block/zram/zram_drv.c
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@ -175,20 +175,11 @@ static inline void update_used_max(struct zram *zram,
} while (old_max != cur_max);
}
static inline void zram_fill_page(char *ptr, unsigned long len,
static inline void zram_fill_page(void *ptr, unsigned long len,
unsigned long value)
{
int i;
unsigned long *page = (unsigned long *)ptr;
WARN_ON_ONCE(!IS_ALIGNED(len, sizeof(unsigned long)));
if (likely(value == 0)) {
memset(ptr, 0, len);
} else {
for (i = 0; i < len / sizeof(*page); i++)
page[i] = value;
}
memset_l(ptr, value, len / sizeof(unsigned long));
}
static bool page_same_filled(void *ptr, unsigned long *element)