From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15928.2469.865487.687367@napali.hpl.hp.com> Date: Wed, 29 Jan 2003 09:04:37 -0800 Subject: Re: Linus rollup In-Reply-To: <20030129095949.A24161@flint.arm.linux.org.uk> References: <20030128220729.1f61edfe.akpm@digeo.com> <20030129095949.A24161@flint.arm.linux.org.uk> Reply-To: davidm@hpl.hp.com Sender: owner-linux-mm@kvack.org Return-Path: To: Russell King Cc: Andrew Morton , Andi Kleen , "David S. Miller" , David Mosberger , Anton Blanchard , linux-mm@kvack.org List-ID: >>>>> On Wed, 29 Jan 2003 09:59:49 +0000, Russell King said: Russell> On Tue, Jan 28, 2003 at 10:07:29PM -0800, Andrew Morton Russell> wrote: >> The frlock code is showing nice speedups, but I think the main >> reason we want this is to fix the problem wherein an application >> spinning on gettimeofday() can make time stop. Russell> I'm slightly concerned about this. With this patch, we Russell> generally seem to do: Russell> [snip...] Russell> The same is true for other architectures; their Russell> gettimeoffset implementations need to be audited by the Russell> architecture maintainers to ensure that they are safe to Russell> run with (local) interrupts enabled. Should be fine as far as ia64 is concerned, since gettimeoffset() currently simply reads the cycle-counter (and I think even HPET-based interpolation would be lock-free). --david -- 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/