Re: [PATCH 0 of 3] [RFC] I/O Hints

["Martin K. Petersen" <martin.petersen@xxxxxxxxxx>]

>>>>> "Jamie" == Jamie Lokier <jamie@xxxxxxxxxxxxx> writes:

Jamie> Where it is due to specific values being not exactly right -
Jamie> like the subdevice offset (or modulo-offset) in MD because it
Jamie> doesn't represent all subdevices - it would be good for the
Jamie> info to have flags saying which _specific_ values are not
Jamie> exactly right.

You get that traversing the sysfs tree.


Jamie> So that programs can choose their heuristics appropriately.
Jamie> After all, users will use suboptimal layouts, and still want
Jamie> the best performance it can do.

I'd like to keep a clear distinction between normal applications and
programs like mkfs.  I'm targeting the latter.

Given that filesystems can lay out files at will, I/O characteristics
for normal applications is really FIEMAP territory.

-- 
Martin K. Petersen	Oracle Linux Engineering

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