Re: [PATCH 00/13] Pass data temperature information to zoned UFS devices

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Hi Bart!

> Zoned UFS vendors need the data temperature information. Hence this
> patch series that restores write hint information in F2FS and in the
> block layer. The SCSI disk (sd) driver is modified such that it passes
> write hint information to SCSI devices via the GROUP NUMBER field.

I don't have any particular problems with your implementation, although
I'm still trying to wrap my head around how to make this coexist with my
I/O hinting series. But I guess there's probably not going to be a big
overlap between devices that support both features.

However, it still pains me greatly to see the SBC proposal being
intertwined with the travesty that is streams. Why not define everything
in the IO advice hints group descriptor? I/O hints already use GROUP
NUMBER as an index. Why not just define a few permanent hint
descriptors? What's the point of the additional level of indirection to
tie this new feature into streams? RSCS basically says "ignore the
streams-specific bits and bobs and do this other stuff instead". What
does the streams infrastructure provide that can't be solved trivially
in the IO advise mode page alone?

For existing UFS devices which predate RSCS and streams but which
support getting data temperature from GROUP NUMBER, what is the
mechanism for detecting and enabling the feature?

-- 
Martin K. Petersen	Oracle Linux Engineering



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