From 904a19d11010a3aedb543a0a34f8d4768613b617 Mon Sep 17 00:00:00 2001 From: hrs Date: Thu, 30 Apr 2009 21:20:09 +0000 Subject: [PATCH] Revise entry for superpages. Suggested by: rwatson Approved by: re (implicit) git-svn-id: svn://svn.freebsd.org/base/releng/7.2@191705 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- .../doc/en_US.ISO8859-1/relnotes/article.sgml | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/release/doc/en_US.ISO8859-1/relnotes/article.sgml b/release/doc/en_US.ISO8859-1/relnotes/article.sgml index cde6e621..37aeb306 100644 --- a/release/doc/en_US.ISO8859-1/relnotes/article.sgml +++ b/release/doc/en_US.ISO8859-1/relnotes/article.sgml @@ -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. -- 2.45.0