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

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Message-ID: <2ca452cd-073a-29fa-1884-99ad1199bb97@huawei.com>
Date:   Tue, 7 Apr 2020 11:40:51 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
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 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?

Thanks,

> 
>>
>> Thanks,
> .
>