linux-kernel - Re: How to document dimension units for virtual files?

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Message-Id: <200610242213.56149.arnd@arndb.de>
Date:	Tue, 24 Oct 2006 22:13:55 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Michael Holzheu <HOLZHEU@...ibm.com>
Cc:	Ingo Oeser <ioe-lkml@...eria.de>, linux-kernel@...r.kernel.org,
	mschwid2@...ibm.com
Subject: Re: How to document dimension units for virtual files?

On Tuesday 24 October 2006 16:15, Michael Holzheu wrote:
> If you want to export data to userspace via virtual filesystems
> like procfs, sysfs, debugfs etc., the following rules are recommended:
>
> - Export only one value in one virtual file.
> - Data format should be as simple as possible.
> - Use ASCII formated strings, no binary data if possible.
> - If data has dimension units, encode that in the filename.
>   Please use the following suffixes:
>   * kb: Kilobytes
>   * mb: Megabytes
>   * ms: Milliseconds
>   * us: Microseconds
>   * ns: Nanoseconds
>   * ...

For larger units like kb or mb, why bother at all?
You can just make that a 64 bit number and give an exact value.
You should also be sure to use a correct unit, i.e.
KiB for 1024 bytes and kB for 1000 bytes.

	Arnd <><
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