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zram: count same page write as page_stored 

Regardless of whether it is same page or not, it's surely write and
stored to zram so we should increase pages_stored stat.  Otherwise, user
can see zero value via mm_stats although he writes a lot of pages to
zram.

Link: http://lkml.kernel.org/r/1494834068-27004-1-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2017-07-06 15:37:12 -07:00 committed by Linus Torvalds
parent 80b18dfa53
commit 51f9f82c85
1 changed files with 2 additions and 0 deletions
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2
drivers/block/zram/zram_drv.c
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@ -469,6 +469,7 @@ static bool zram_same_page_write(struct zram *zram, u32 index,
zram_slot_unlock(zram, index);
atomic64_inc(&zram->stats.same_pages);
atomic64_inc(&zram->stats.pages_stored);
return true;
}
kunmap_atomic(mem);
@ -524,6 +525,7 @@ static void zram_free_page(struct zram *zram, size_t index)
zram_clear_flag(zram, index, ZRAM_SAME);
zram_set_element(zram, index, 0);
atomic64_dec(&zram->stats.same_pages);
atomic64_dec(&zram->stats.pages_stored);
return;
}