From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 125706003C1 for ; Tue, 26 Jan 2010 11:24:23 -0500 (EST) Date: Tue, 26 Jan 2010 17:24:19 +0100 From: Andi Kleen Subject: Re: [PATCH 00 of 30] Transparent Hugepage support #3 Message-ID: <20100126162419.GE6567@basil.fritz.box> References: <20100122151947.GA3690@random.random> <20100123175847.GC6494@random.random> <4B5E3CC0.2060006@redhat.com> <20100126161625.GO30452@random.random> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100126161625.GO30452@random.random> Sender: owner-linux-mm@kvack.org To: Andrea Arcangeli Cc: Christoph Lameter , Rik van Riel , linux-mm@kvack.org, Marcelo Tosatti , Adam Litke , Avi Kivity , Izik Eidus , Hugh Dickins , Nick Piggin , Mel Gorman , Andi Kleen , Dave Hansen , Benjamin Herrenschmidt , Ingo Molnar , Mike Travis , KAMEZAWA Hiroyuki , Chris Wright , Andrew Morton List-ID: On Tue, Jan 26, 2010 at 05:16:25PM +0100, Andrea Arcangeli wrote: > On Tue, Jan 26, 2010 at 09:54:59AM -0600, Christoph Lameter wrote: > > Huge pages are already in use through hugetlbs for such workloads. That > > works without swap. So why is this suddenly such a must have requirement? > > hugetlbfs is unusable when you're not doing a static alloc for 1 DBMS > in 1 machine with alloc size set in a config file that will then match > grub command line. AFAIK that's not true for 2MB pages after all the enhancements Andy/Mel/et.al. did to the defragmentation heuristics, assuming you have enough memory (or define movable zones) hugetlbfs also does the transparent fallback. It's not pretty, but it seems to work for a lot of people. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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