Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262001AbVBQA6K (ORCPT ); Wed, 16 Feb 2005 19:58:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262067AbVBQA6K (ORCPT ); Wed, 16 Feb 2005 19:58:10 -0500 Received: from omx1-ext.sgi.com ([192.48.179.11]:65173 "EHLO omx1.americas.sgi.com") by vger.kernel.org with ESMTP id S262001AbVBQA6B (ORCPT ); Wed, 16 Feb 2005 19:58:01 -0500 Date: Wed, 16 Feb 2005 16:57:47 -0800 (PST) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: torvalds@osdl.org, Andrew Morton cc: Nick Piggin , Andi Kleen , hugh@veritas.com, linux-mm@kvack.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, benh@kernel.crashing.org Subject: page fault scalability patchsets update: prezeroing, prefaulting and atomic operations In-Reply-To: <1107304296.5131.13.camel@npiggin-nld.site> Message-ID: References: <41E5B7AD.40304@yahoo.com.au> <41E5BC60.3090309@yahoo.com.au> <20050113031807.GA97340@muc.de> <20050113180205.GA17600@muc.de> <20050114043944.GB41559@muc.de> <20050114170140.GB4634@muc.de> <41FF00CE.8060904@yahoo.com.au> <1107304296.5131.13.camel@npiggin-nld.site> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1588 Lines: 44 I thought I save myself the constant crossposting of large amounts of patches. Patches, documentation, test results etc are available at http://oss.sgi.com/projects/page_fault_performance/ Changes: - Performance tests for all patchsets (i386 single processor, Altix 8 processors and Altix 128 processors) - Archives of patches so far - Some docs (still needs work) - Patches against 2.6.11-rc4-bk4 Patch specific: atomic operations for page faults (V17) - Avoid incrementing page count for page in do_wp_page (see discussion with Nick Piggin on last patchset) prezeroing (V7) - set /proc/sys/vm/scrub_load to 1 by default to avoid slight performance loss during kernel compile on i386 - Scrubd needs to be configured in kernel configuration as an experimental feature. - Patch still follows kswapd's method to bind node specific scrubd daemons to each NUMA node. Cannot find any new infrastructure to assign tasks to certain nodes. kthread_bind() binds to single cpu and not to a NUMA node. Guess other API work would have to be first done to realize Andrews proposed approach. prefaulting (V5) - Set default for /proc/sys/vm/max_prealloc_order to 1 to avoid overallocating pages which led to a performance loss in some situations. This is pretty complex thing to manage so please tell me if I missed anything ... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/