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SubjectRe: per-bdi-throttling: synchronous writepage doesn't work correctly
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> The page not having PG_writeback set on return is a hint, but not fool
> proof, it could be the device is just blazing fast.

Hmm, does it actually has to be foolproof though? What will happen if
bdi_writeout_inc() is called twice for the page? The device will get
twice the number of pages it deserves? That's not all that bad,
especially since that is a really really fast device.

Miklos
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