From owner-svn-src-all@FreeBSD.ORG Thu Apr 30 21:20:10 2009 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 186431065672; Thu, 30 Apr 2009 21:20:10 +0000 (UTC) (envelope-from hrs@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 064DC8FC0C; Thu, 30 Apr 2009 21:20:10 +0000 (UTC) (envelope-from hrs@FreeBSD.org) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id n3ULK9ut023131; Thu, 30 Apr 2009 21:20:09 GMT (envelope-from hrs@svn.freebsd.org) Received: (from hrs@localhost) by svn.freebsd.org (8.14.3/8.14.3/Submit) id n3ULK9m2023130; Thu, 30 Apr 2009 21:20:09 GMT (envelope-from hrs@svn.freebsd.org) Message-Id: <200904302120.n3ULK9m2023130@svn.freebsd.org> From: Hiroki Sato Date: Thu, 30 Apr 2009 21:20:09 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org X-SVN-Group: releng MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r191705 - releng/7.2/release/doc/en_US.ISO8859-1/relnotes X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 30 Apr 2009 21:20:10 -0000 Author: hrs Date: Thu Apr 30 21:20:09 2009 New Revision: 191705 URL: http://svn.freebsd.org/changeset/base/191705 Log: Revise entry for superpages. Suggested by: rwatson Approved by: re (implicit) Modified: releng/7.2/release/doc/en_US.ISO8859-1/relnotes/article.sgml Modified: releng/7.2/release/doc/en_US.ISO8859-1/relnotes/article.sgml ============================================================================== --- releng/7.2/release/doc/en_US.ISO8859-1/relnotes/article.sgml Thu Apr 30 19:25:44 2009 (r191704) +++ releng/7.2/release/doc/en_US.ISO8859-1/relnotes/article.sgml Thu Apr 30 21:20:09 2009 (r191705) @@ -296,15 +296,16 @@ VFS_AIO. The &os; virtual memory subsystem now - supports Superpages. The - Superpages is a feature that - enables each entry in the TLB (translation lookaside buffer) - to map a large physical memory region into a virtual address - space in modern CPUs. This provides possible memory savings - for applications that share large amounts of memory between - the address spaces and performance improvements due to fewer - TLB misses. This is disabled by default and can be enabled by - setting a loader tunable + supports fully transparent use of + superpages for application memory; + application memory pages are dynamically promoted to or + demoted from superpages without any modification to + application code. This change offers the benefit of large + page sizes such as improved virtual memory efficiency and + reduced TLB (translation lookaside buffer) misses without + downsides like application changes and virtual memory + inflexibility. This is disabled by default and can be enabled + by setting a loader tunable vm.pmap.pg_ps_enabled to 1.