linux-ext4 - RE: ext4 out of order when use cfq scheduler

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Message-ID: <ac387f41e9604a229d680a94930b74d9@SGPMBX1004.APAC.bosch.com>
Date:	Thu, 24 Mar 2016 10:16:05 +0000
From:	"HUANG Weller (CM/ESW12-CN)" <Weller.Huang@...bosch.com>
To:	Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>
CC:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"Li, Michael" <huayil@....qualcomm.com>
Subject: RE: ext4 out of order when use cfq scheduler

> 
> OK, I have something - Huang, can you check whether the attached patches also
> fix your data exposure issues please? The first patch is the original fix, patch two
> is a cleanup, patches 3 and 4 implement the speedup suggested by Ted. Patches
> are only lightly tested so far.  I'll run more comprehensive tests later and in
> particular I want to check whether the additional complexity actually brings us
> some advantage at least for workloads which redirty pages in addition to writing
> some new ones using delayed allocation.
> 

Test done.
Both targets(kernel 3.10.63) PASS the power loss test with 10,000 cycles. Test with io-scheduler CFQ.
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