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

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Date:	Wed, 29 Aug 2007 15:25:52 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	balbir@...ux.vnet.ibm.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

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? ;)

Imagine a careful application setting and accounting for limits on a
long-running system.  Might its internal accounting get sufficiently
misaligned from the kernel's after a while to cause a problem?
Truncating values like that would appear reserve significantly less
memory than desired over a long period of time.

-- Dave

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