linux-kernel - Re: [-mm PATCH] Memory controller improve user interface

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Message-ID: <46D5F517.1080809@linux.vnet.ibm.com>
Date:	Thu, 30 Aug 2007 04:07:11 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Dave Hansen <haveblue@...ibm.com>
CC:	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MM Mailing List <linux-mm@...ck.org>,
	David Rientjes <rientjes@...gle.com>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [-mm PATCH] Memory controller improve user interface

Dave Hansen wrote:
> On Wed, 2007-08-29 at 15:20 -0700, Paul Menage wrote:
>> I'd argue that having the user's specified limit be truncated to the
>> page size is less confusing than giving an EINVAL if it's not page
>> aligned.
> 
> Do we truncate mmap() values to the nearest page so to not confuse the
> user? ;)
> 

I think rounding to the closest page size is a better option, but
again it can be a bit confusing. I am all for using memparse() to
parse the user input as a specification of the memory limit.

The second question of how to store it internally without truncation/
rounding is something we need to agree upon. We also need to see
how to display the data back to the user.

I chose kilobytes for two reasons

1. Several people recommended it
2. Herbert mentioned that they've moved to that interface and it
   was working fine for them.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL

PS: I am going off to the web to search for some CUI/CLI guidelines.
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