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

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Date:	Fri, 24 Apr 2009 08:54:37 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Kay Sievers <kay.sievers@...y.org>
CC:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	rwheeler@...hat.com, snitzer@...hat.com, neilb@...e.de,
	James.Bottomley@...senpartnership.com, dgilbert@...erlog.com,
	jens.axboe@...cle.com, matthew@....cx, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2 of 9] block: Export I/O topology for block devices and
 	partitions

Kay Sievers wrote:
> On Fri, Apr 24, 2009 at 07:32, Martin K. Petersen
> <martin.petersen@...cle.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



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