linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ

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Message-ID: <20200407025913.GB137081@google.com>
Date:   Mon, 6 Apr 2020 19:59:13 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach
 REQ_META/FUA

On 04/07, Chao Yu wrote:
> On 2020/4/4 0:12, Jaegeuk Kim wrote:
> > This patch introduces a way to attach REQ_META/FUA explicitly
> > to all the data writes given temperature.
> > 
> > -> attach REQ_FUA to Hot Data writes
> > 
> > -> attach REQ_FUA to Hot|Warm Data writes
> > 
> > -> attach REQ_FUA to Hot|Warm|Cold Data writes
> > 
> > -> attach REQ_FUA to Hot|Warm|Cold Data writes as well as
> >           REQ_META to Hot Data writes
> 
> Out of curiosity, what scenario it is used for?

It's testing purpose to compare the bandwidths per different IO flags.

> 
> Thanks,