Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA

[Chao Yu]

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,
> .
>