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

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Message-ID: <20200409022005.GA110440@google.com>
Date:   Wed, 8 Apr 2020 19:20:05 -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 2020/4/7 10:59, Jaegeuk Kim wrote:
> > 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 for the hint. :)
> 
> As nobarrier was set in Android, so REQ_PREFLUSH will not be considered in
> this sysfs interface?

I don't see any diff on performance, so not interesting. :)

> 
> Thanks,
> 
> > 
> >>
> >> Thanks,
> > .
> >