From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Stephen C. Tweedie" MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14329.390.453805.801086@dukat.scot.redhat.com> Date: Mon, 4 Oct 1999 20:35:34 +0100 (BST) Subject: Re: MMIO regions In-Reply-To: References: <14328.53659.36975.874284@dukat.scot.redhat.com> Sender: owner-linux-mm@kvack.org Return-Path: To: James Simmons Cc: "Stephen C. Tweedie" , Linux MM List-ID: Hi, On Mon, 4 Oct 1999 14:29:14 -0400 (EDT), James Simmons said: > Okay. But none of this prevents a rogue app from hosing your system. Such > a process doesn't have to bother with locks or semaphores. And we talked about this before. You _can_ make such a guarantee, but it is hideously expensive especially on SMP. You either protect the memory or the CPU against access by the other app, and that requires either scheduler or VM interrupts between CPUs. --Stephen -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://humbolt.geo.uu.nl/Linux-MM/