Messages in this thread |  | | Date | Wed, 8 Apr 2020 19:28:02 -0700 | From | Jaegeuk Kim <> | Subject | Re: [f2fs-dev] [PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA |
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On 04/09, Chao Yu wrote: > On 2020/4/9 10:20, Jaegeuk Kim wrote: > > 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. :) > > I doubt it may has diff on non-ufs/emmc device? just guess.
I don't have any data on emmc, so maybe. Which case do we send REQ_PREFLUSH?
> > Thanks, > > > > >> > >> Thanks, > >> > >>> > >>>> > >>>> Thanks, > >>> . > >>> > > . > >
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