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From: Chao Yu <yuchao0@huawei.com>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: <linux-kernel@vger.kernel.org>,
	<linux-f2fs-devel@lists.sourceforge.net>,
	<kernel-team@android.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA
Date: Tue, 7 Apr 2020 11:40:51 +0800	[thread overview]
Message-ID: <2ca452cd-073a-29fa-1884-99ad1199bb97@huawei.com> (raw)
In-Reply-To: <20200407025913.GB137081@google.com>

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,
> .
> 

  reply	other threads:[~2020-04-07  3:40 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-03 16:12 [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA Jaegeuk Kim
2020-04-07  2:16 ` [f2fs-dev] " Chao Yu
2020-04-07  2:59   ` Jaegeuk Kim
2020-04-07  3:40     ` Chao Yu [this message]
2020-04-09  2:20       ` Jaegeuk Kim
2020-04-09  2:23         ` Chao Yu
2020-04-09  2:28           ` Jaegeuk Kim
2020-04-09  2:31             ` Chao Yu
2020-04-16  7:18 ` Chao Yu

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