From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933004AbXCOHbW (ORCPT ); Thu, 15 Mar 2007 03:31:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932975AbXCOHbW (ORCPT ); Thu, 15 Mar 2007 03:31:22 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:41117 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S932231AbXCOHbV (ORCPT ); Thu, 15 Mar 2007 03:31:21 -0400 Date: Thu, 15 Mar 2007 00:31:18 -0700 (PDT) Message-Id: <20070315.003118.41650094.davem@davemloft.net> To: akpm@linux-foundation.org Cc: paulus@samba.org, clameter@sgi.com, linux-kernel@vger.kernel.org, ak@suse.com, holt@sgi.com, linux-ia64@vger.kernel.org, mpm@selenic.com Subject: Re: [QUICKLIST 0/6] Arch independent quicklists V1 From: David Miller In-Reply-To: <20070315002249.9e531578.akpm@linux-foundation.org> References: <20070312.192616.63128242.davem@davemloft.net> <20070312.193211.30184040.davem@davemloft.net> <20070315002249.9e531578.akpm@linux-foundation.org> X-Mailer: Mew version 5.1.52 on Emacs 21.4 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Andrew Morton Date: Thu, 15 Mar 2007 00:22:49 -0800 > So... what would happen if sparc64 were to use neither quicklists nor > slab? Just grab these pages from the page allocator and clear them? The page table allocator is heavier weight than the quicklists, although obviously not as heavy weight as SLAB. I know special purpose allocation lists suck, but they really help in this case in my opinion. And for the x86 cases it's not going to help to have GFP_ZERO stuff via the page allocator for page tables, they have to have specific bits in the pre-initialized areas for the kernel PGDs, not just zero.