linux-kernel - [PATCH v2 0/3] zram: add rw_page implementation for zram and clean up unnecessary parameter

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Date:	Mon, 13 Oct 2014 17:55:39 +0900
From:	karam.lee@....com
To:	minchan@...nel.org, ngupta@...are.org, linux-kernel@...r.kernel.org
Cc:	matthew.r.wilcox@...el.com, jmarchan@...hat.com,
	seungho1.park@....com, "karam.lee" <karam.lee@....com>
Subject: [PATCH v2 0/3] zram: add rw_page implementation for zram and clean up unnecessary parameter

From: "karam.lee" <karam.lee@....com>

Recently rw_page block device operation has been added.
This patchset implements rw_page operation for zram block device
and does some clean-up .

I implemented the feature in zram and tested it.
Test bed was the G2, LG electronic mobile device, whtich has msm8974
processor and 2GB memory.
With a memory allocation test program consuming memory, the system
generates swap.
And operating time of swap_write_page() was measured.

--------------------------------------------------
|             |   operating time   | improvement |
|             |  (20 runs average) |             |
--------------------------------------------------
|with patch   |    1087.35 us      |             |
--------------------------------------------------
|without patch|    1061.15 us      |    +2.4%    |
--------------------------------------------------

Each test(with paged_io,with BIO)  result set shows normal distribution
and has equal variance.
I mean the two values are valid result to compare.
I can say operation with paged I/O(without BIO)  is faster 2.4% with
confidence level 95%.

Patches 1~2 are for clean-up.
Patch 3 is for implementation of rw_page operation.
With the rw_page operation, zram can do I/O without allocating a BIO.
It make zram can save time and memory.

karam.lee (3):
  zram: remove bio parameter from zram_bvec_rw().
  zram: change parameter from vaild_io_request()
  zram: implement rw_page operation of zram

 drivers/block/zram/zram_drv.c |   69 +++++++++++++++++++++++++++++++----------
 1 file changed, 53 insertions(+), 16 deletions(-)

-- 
1.7.9.5

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