From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e4.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id l7TMIGZk031083 for ; Wed, 29 Aug 2007 18:18:16 -0400 Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v8.5) with ESMTP id l7TMIGdg477010 for ; Wed, 29 Aug 2007 18:18:16 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l7TMIFvf008724 for ; Wed, 29 Aug 2007 18:18:15 -0400 Subject: Re: [-mm PATCH] Memory controller improve user interface From: Dave Hansen In-Reply-To: <46D5ED5C.9030405@linux.vnet.ibm.com> References: <20070829111030.9987.8104.sendpatchset@balbir-laptop> <1188413148.28903.113.camel@localhost> <46D5ED5C.9030405@linux.vnet.ibm.com> Content-Type: text/plain Date: Wed, 29 Aug 2007 15:18:14 -0700 Message-Id: <1188425894.28903.140.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: balbir@linux.vnet.ibm.com Cc: Andrew Morton , Linux Kernel Mailing List , Linux MM Mailing List , David Rientjes , Linux Containers , Paul Menage List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org