Re: [PATCH 2 of 9] block: Export I/O topology for block devices and partitions

[Jeff Garzik <jeff@garzik.org>]

Kay Sievers wrote:
> On Fri, Apr 24, 2009 at 07:32, Martin K. Petersen
> <martin.petersen@oracle.com> wrote:
>> +What:          /sys/block/<disk>/alignment
>> +What:          /sys/block/<disk>/<partition>/alignment
>> +What:          /sys/block/<disk>/queue/minimum_io_size
>> +What:          /sys/block/<disk>/queue/optimal_io_size
> 
> Wouldn't it be good to include "sector", like the queue files do? The
> alignment of a partition could mean many things.
>   /sys/block/<disk>/sector_alignment
>   /sys/block/<disk>/<partition>/sector_alignment
> 
> And prefixing the io values might be easier to read when they show up
> in a group?
>   /sys/block/<disk>/queue/io_minimum_size
>   /sys/block/<disk>/queue/io_optimal_size
>   /sys/block/<disk>/queue/io_...

Why do we need all this syscall overhead just to read individual data items?

Isn't it dumb to require 30 userland syscalls simply to input a 
10-member data structure?

netlink looks more and more attractive for anything non-trivial.

	Jeff