Messages in this thread |  | | Date | Wed, 8 Apr 2020 19:20:05 -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 04/07, 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, > > . > >
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