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view test/jprt.config @ 1973:631f79e71e90
6974966: G1: unnecessary direct-to-old allocations
Summary: This change revamps the slow allocation path of G1. Improvements include the following: a) Allocations directly to old regions are now totally banned. G1 now only allows allocations out of young regions (with the only exception being humongous regions). b) The thread that allocates a new region (which is now guaranteed to be young) does not dirty all its cards. Each thread that successfully allocates out of a young region is now responsible for dirtying the cards that corresponding to the "block" that just got allocated. c) allocate_new_tlab() and mem_allocate() are now implemented differently and TLAB allocations are only done by allocate_new_tlab(). d) If a thread schedules an evacuation pause in order to satisfy an allocation request, it will perform the allocation at the end of the safepoint so that the thread that initiated the GC also gets "first pick" of any space made available by the GC. e) If a thread is unable to allocate a humongous object it will schedule an evacuation pause in case it reclaims enough regions so that the humongous allocation can be satisfied aftewards. f) The G1 policy is more careful to set the young list target length to be the survivor number +1. g) Lots of code tidy up, removal, refactoring to make future changes easier.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Tue, 24 Aug 2010 17:24:33 -0400 |
parents | c18cbe5936b8 |
children | f08d439fab8c |
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#!echo "This is not a shell script" ############################################################################# # # Copyright (c) 2006, 2007, Oracle and/or its affiliates. All rights reserved. # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. # # This code is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License version 2 only, as # published by the Free Software Foundation. # # This code is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License # version 2 for more details (a copy is included in the LICENSE file that # accompanied this code). # # You should have received a copy of the GNU General Public License version # 2 along with this work; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. # # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA # or visit www.oracle.com if you need additional information or have any # questions. # ############################################################################# ############################################################################# # # JPRT shell configuration for testing. # # Input environment variables: # Windows Only: # PATH # ROOTDIR # # Output variable settings: # make Full path to GNU make # # Output environment variables: # PATH # ############################################################################# ############################################################################# # Error error() # message { echo "ERROR: $1" exit 6 } # Directory must exist dirMustExist() # dir name { if [ ! -d "$1" ] ; then error "Directory for $2 does not exist: $1" fi } # File must exist fileMustExist() # dir name { if [ ! -f "$1" ] ; then error "File for $2 does not exist: $1" fi } ############################################################################# # Should be set by JPRT as the 3 basic inputs slashjava="${ALT_SLASH_JAVA}" if [ "${slashjava}" = "" ] ; then slashjava=/java fi # Check input dirMustExist "${slashjava}" ALT_SLASH_JAVA # Uses 'uname -s', but only expect SunOS or Linux, assume Windows otherwise. osname=`uname -s` if [ "${osname}" = SunOS ] ; then # SOLARIS: Sparc or X86 osarch=`uname -p` if [ "${osarch}" = sparc ] ; then solaris_arch=sparc else solaris_arch=i386 fi # Add basic solaris system paths path4sdk=/usr/ccs/bin:/usr/ccs/lib:/usr/bin:/bin:/usr/sfw/bin # Find GNU make make=/usr/sfw/bin/gmake if [ ! -f ${make} ] ; then make=/opt/sfw/bin/gmake if [ ! -f ${make} ] ; then make=${slashjava}/devtools/${solaris_arch}/bin/gnumake fi fi fileMustExist "${make}" make # File creation mask umask 002 elif [ "${osname}" = Linux ] ; then # Add basic paths path4sdk=/usr/bin:/bin:/usr/sbin:/sbin # Find GNU make make=/usr/bin/make fileMustExist "${make}" make umask 002 else # Windows: Differs on CYGWIN vs. MKS. # We need to determine if we are running a CYGWIN shell or an MKS shell # (if uname isn't available, then it will be unix_toolset=unknown) unix_toolset=unknown if [ "`uname -a | fgrep Cygwin`" = "" -a -d "${ROOTDIR}" ] ; then # We kind of assume ROOTDIR is where MKS is and it's ok unix_toolset=MKS mkshome=`dosname -s "${ROOTDIR}"` # Most unix utilities are in the mksnt directory of ROOTDIR unixcommand_path="${mkshome}/mksnt" path4sdk="${unixcommand_path}" devtools_path="${slashjava}/devtools/win32/bin" path4sdk="${devtools_path};${path4sdk}" # Find GNU make make="${devtools_path}/gnumake.exe" fileMustExist "${make}" make elif [ "`uname -a | fgrep Cygwin`" != "" -a -f /bin/cygpath ] ; then # For CYGWIN, uname will have "Cygwin" in it, and /bin/cygpath should exist unix_toolset=CYGWIN # Most unix utilities are in the /usr/bin unixcommand_path="/usr/bin" path4sdk="${unixcommand_path}" # Find GNU make make="${unixcommand_path}/make.exe" fileMustExist "${make}" make else echo "WARNING: Cannot figure out if this is MKS or CYGWIN" fi # For windows, it's hard to know where the system is, so we just add this # to PATH. slash_path="`echo ${path4sdk} | sed -e 's@\\\\@/@g' -e 's@//@/@g' -e 's@/$@@' -e 's@/;@;@g'`" path4sdk="${slash_path};${PATH}" # Convert path4sdk to cygwin style if [ "${unix_toolset}" = CYGWIN ] ; then path4sdk="`/usr/bin/cygpath -p ${path4sdk}`" fi fi # Export PATH setting PATH="${path4sdk}" export PATH