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UPSTREAM: zram: count same page write as page_stored

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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>

(cherry picked from commit 51f9f82c855d65ef14c2af10e0d2c86ec332a182)
Signed-off-by: Peter Kalauskas <peskal@google.com>
Bug: 112488418
Change-Id: I006d80df413a0fe0fd7dd58e535c6a2c03ab2c9d
This commit is contained in:
Minchan Kim 2017-07-06 15:37:12 -07:00 • committed by Peter Kalauskas
parent 69aa01aaee
commit c30307c479
1 changed files with 2 additions and 0 deletions
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2
drivers/block/zram/zram_drv.c
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@ -468,6 +468,7 @@ 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);
@ -523,6 +524,7 @@ 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;
}