From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sun, 30 Dec 2007 17:33:15 +0100 From: Ingo Molnar Subject: Re: [patch] mm: fix PageUptodate memory ordering bug Message-ID: <20071230163315.GA1384@elte.hu> References: <20071218012632.GA23110@wotan.suse.de> <20071222005737.2675c33b.akpm@linux-foundation.org> <20071223055730.GA29288@wotan.suse.de> <20071222223234.7f0fbd8a.akpm@linux-foundation.org> <20071223071529.GC29288@wotan.suse.de> <20071222232932.590e2b6c.akpm@linux-foundation.org> <20071223091405.GA15631@wotan.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071223091405.GA15631@wotan.suse.de> Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: Andrew Morton , Hugh Dickins , Linux Memory Management List , Benjamin Herrenschmidt , Linus Torvalds , Andi Kleen , Alan Cox List-ID: * Nick Piggin wrote: > > Sounds worthwhile, if we can't do it via altinstructions. > > Altinstructions means we still have code bloat, and sometimes extra > branches etc (an extra 900 bytes of icache in mm/ alone, even before > my fix). I'll let Linus or one of the x86 guys weigh in, though. It's > a really sad cost for distro kernels to carry. hm, we should at minimum display a warning if the workaround is not enabled and such a kernel is booted on a true PPro that is affected by this. Ingo -- 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