linux-kernel - [PATCH] zram: clear disk io accounting when reset zram device

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Date:	Fri, 29 May 2015 11:23:24 +0800
From:	Weijie Yang <weijie.yang@...sung.com>
To:	'Minchan Kim' <minchan@...nel.org>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	sergey.senozhatsky.work@...il.com, ngupta@...are.org,
	'Weijie Yang' <weijie.yang.kh@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] zram: clear disk io accounting when reset zram device

This patch clears zram disk io accounting when reset the zram device,
if don't do this, the residual io accounting stat will affect the
diskstat in the next zram active cycle.

Signed-off-by: Weijie Yang <weijie.yang@...sung.com>
---
 drivers/block/zram/zram_drv.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 8dcbced..6e134f4 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -805,7 +805,9 @@ static void zram_reset_device(struct zram *zram)
 	memset(&zram->stats, 0, sizeof(zram->stats));
 	zram->disksize = 0;
 	zram->max_comp_streams = 1;
+
 	set_capacity(zram->disk, 0);
+	part_stat_set_all(&zram->disk->part0, 0);
 
 	up_write(&zram->init_lock);
 	/* I/O operation under all of CPU are done so let's free */
-- 
1.7.10.4


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