Re: [PATCH] block_dev: implement readpages() to optimize sequential read

[Jeff Moyer]

Akinobu Mita <akinobu.mita@xxxxxxxxx> writes:

> Sequential read from a block device is expected to be equal or faster
> than from the file on a filesystem.  But it is not correct due to the
> lack of effective readpages() in the address space operations for
> block device.

Ah, a trip down memory lane.  ;-)  Here's a thread showing issues with
the last time this was proposed (by me, incidentally):

https://lkml.org/lkml/2009/6/2/480

At the very least, we need to see numbers on a real device, and see it
booted on something with >4k page size before taking this back in.

Cheers,
Jeff
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