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

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Message-Id: <1188425894.28903.140.camel@localhost>
Date:	Wed, 29 Aug 2007 15:18:14 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	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>,
	Paul Menage <menage@...gle.com>
Subject: Re: [-mm PATCH]  Memory controller improve user interface

On Thu, 2007-08-30 at 03:34 +0530, Balbir Singh wrote:
> I've thought about this before. The problem is that a user could
> set his limit to 10000 bytes, but would then see the usage and
> limit round to the closest page boundary. This can be confusing
> to a user. 

True, but we're lying if we allow a user to set their limit there,
because we can't actually enforce a limit at 8,192 bytes vs 10,000.
They're the same limit as far as the kernel is concerned.

Why not just -EINVAL if the value isn't page-aligned?  There are plenty
of interfaces in the kernel that require userspace to know the page
size, so this shouldn't be too difficult.

-- Dave

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