linux-kernel - Re: [PATCH] xen: make sysfs files behave as their names suggest

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Message-ID: <4981311D.9080205@goop.org>
Date:	Wed, 28 Jan 2009 20:31:25 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Simon Horman <horms@...ge.net.au>
CC:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stable Kernel <stable@...nel.org>,
	"dan.magenheimer@...cle.com" <dan.magenheimer@...cle.com>
Subject: Re: [PATCH] xen: make sysfs files behave as their names suggest

Simon Horman wrote:
> On Wed, Jan 28, 2009 at 04:50:20PM -0800, Jeremy Fitzhardinge wrote:
>   
>> 1: make "target_kb" only accept and produce a memory size in kilobytes.
>> 2: add a second "target" file which produces output in bytes, and will accept
>>   memparse input (scaled bytes)
>>
>> This fixes the rather irritating problem that writing the same value
>> read back into target_kb would end up shrinking the domain by a factor
>> of 1024, with generally bad results.
>>     
>
> Are there any compatibility issues that we should care about
> related to this change?
>   

Well, in theory, but not in practice I think.

It changes the behaviour of target_kb from accepting bytes into 
kilobytes, and it no longer parses a k/m/g suffix.  The old behaviour 
was a definite bug, given the name of the file, so I consider this to be 
pure bugfix.  The kernel introducing this interface has only been out 
for a week or two, so I don't think there's much chance anyone has 
started relying on the buggy behaviour.

    J
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