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SubjectRe: [RFC PATCH 0/2] apply write hints to select the type of segments

Next time please coordinate this with the block list and Jens, who
actually wrote the patch.

> hints segment type
> ----- ------------
> WRITE_LIFE_SHORT CURSEG_COLD_DATA
> WRITE_LIFE_EXTREME CURSEG_HOT_DATA
> others CURSEG_WARM_DATA

Normally cold data is data with a long lifetime, and extreme is colder
than cold, so there seems to be some mismatch here.

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