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

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/20170720184539.31609-7-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Tested-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2017-09-08 16:14:07 -07:00 committed by Linus Torvalds
parent 92ce4c3ea7
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)