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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 | 7aff5786cc02 |
children | 0a8e0d4345b3 |
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# # Copyright (c) 1995, 2009, 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. # # # # Makefile to run various jdk tests # # Get OS/ARCH specifics OSNAME = $(shell uname -s) ifeq ($(OSNAME), SunOS) PLATFORM = solaris SLASH_JAVA = /java ARCH = $(shell uname -p) ifeq ($(ARCH), i386) ARCH=i586 endif endif ifeq ($(OSNAME), Linux) PLATFORM = linux SLASH_JAVA = /java ARCH = $(shell uname -m) ifeq ($(ARCH), i386) ARCH = i586 endif endif ifeq ($(OSNAME), Windows_NT) PLATFORM = windows SLASH_JAVA = J: ifeq ($(word 1, $(PROCESSOR_IDENTIFIER)),ia64) ARCH = ia64 else ifeq ($(word 1, $(PROCESSOR_IDENTIFIER)),AMD64) ARCH = x64 else ifeq ($(word 1, $(PROCESSOR_IDENTIFIER)),EM64T) ARCH = x64 else ARCH = i586 endif endif endif EXESUFFIX = .exe endif ifdef ALT_SLASH_JAVA SLASH_JAVA = $(ALT_SLASH_JAVA) endif # Utilities used CD = cd CP = cp ECHO = echo MKDIR = mkdir ZIP = zip # Root of this test area (important to use full paths in some places) TEST_ROOT := $(shell pwd) # Root of all test results ifdef ALT_OUTPUTDIR ABS_BUILD_ROOT = $(ALT_OUTPUTDIR)/$(PLATFORM)-$(ARCH) else ABS_BUILD_ROOT = $(TEST_ROOT)/../build/$(PLATFORM)-$(ARCH) endif ABS_TEST_OUTPUT_DIR = $(ABS_BUILD_ROOT)/testoutput # Expect JPRT to set PRODUCT_HOME (the product or jdk in this case to test) ifndef PRODUCT_HOME # Try to use j2sdk-image if it exists ABS_JDK_IMAGE = $(ABS_BUILD_ROOT)/j2sdk-image PRODUCT_HOME := \ $(shell \ if [ -d $(ABS_JDK_IMAGE) ] ; then \ $(ECHO) "$(ABS_JDK_IMAGE)"; \ else \ $(ECHO) "$(ABS_BUILD_ROOT)" ; \ fi) endif # Expect JPRT to set JAVA_ARGS (e.g. -server etc.) JAVA_OPTIONS = ifdef JAVA_ARGS JAVA_OPTIONS = $(JAVA_ARGS) endif # Expect JPRT to set JPRT_ARCHIVE_BUNDLE (path to zip bundle for results) ARCHIVE_BUNDLE = $(ABS_TEST_OUTPUT_DIR)/ARCHIVE_BUNDLE.zip ifdef JPRT_ARCHIVE_BUNDLE ARCHIVE_BUNDLE = $(JPRT_ARCHIVE_BUNDLE) endif # How to create the test bundle (pass or fail, we want to create this) BUNDLE_UP = ( $(MKDIR) -p `dirname $(ARCHIVE_BUNDLE)` \ && $(CD) $(ABS_TEST_OUTPUT_DIR) \ && $(ZIP) -q -r $(ARCHIVE_BUNDLE) . ) BUNDLE_UP_FAILED = ( exitCode=$$? && $(BUNDLE_UP) && exit $${exitCode} ) ################################################################ # Default make rule (runs jtreg_tests) all: jtreg_tests @$(ECHO) "Testing completed successfully" # Prep for output prep: clean @$(MKDIR) -p $(ABS_TEST_OUTPUT_DIR) @$(MKDIR) -p `dirname $(ARCHIVE_BUNDLE)` # Cleanup clean: $(RM) -r $(ABS_TEST_OUTPUT_DIR) $(RM) $(ARCHIVE_BUNDLE) ################################################################ # jtreg tests # Expect JT_HOME to be set for jtreg tests. (home for jtreg) JT_HOME = $(SLASH_JAVA)/re/jtreg/4.0/promoted/latest/binaries/jtreg ifdef JPRT_JTREG_HOME JT_HOME = $(JPRT_JTREG_HOME) endif # Expect JPRT to set TESTDIRS to the jtreg test dirs JTREG_TESTDIRS = demo/jvmti/gctest demo/jvmti/hprof ifdef TESTDIRS JTREG_TESTDIRS = $(TESTDIRS) endif # Default JTREG to run (win32 script works for everybody) JTREG = $(JT_HOME)/win32/bin/jtreg # Option to tell jtreg to not run tests marked with "ignore" ifeq ($(PLATFORM), windows) JTREG_KEY_OPTION = -k:!ignore else JTREG_KEY_OPTION = -k:\!ignore endif #EXTRA_JTREG_OPTIONS = jtreg_tests: prep $(JT_HOME) $(PRODUCT_HOME) $(JTREG) $(JTREG) -a -v:fail,error \ $(JTREG_KEY_OPTION) \ $(EXTRA_JTREG_OPTIONS) \ -r:$(ABS_TEST_OUTPUT_DIR)/JTreport \ -w:$(ABS_TEST_OUTPUT_DIR)/JTwork \ -jdk:$(PRODUCT_HOME) \ $(JAVA_OPTIONS:%=-vmoption:%) \ $(JTREG_TESTDIRS) \ || $(BUNDLE_UP_FAILED) $(BUNDLE_UP) PHONY_LIST += jtreg_tests ################################################################ # clienttest (make sure various basic java client options work) clienttest: prep $(PRODUCT_HOME) $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -version $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -help $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -X $(RM) $(PRODUCT_HOME)/jre/lib/*/client/classes.jsa $(RM) $(PRODUCT_HOME)/jre/lib/*/client/classes_g.jsa $(RM) $(PRODUCT_HOME)/jre/bin/client/classes.jsa $(RM) $(PRODUCT_HOME)/jre/bin/client/classes_g.jsa $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -Xshare:dump PHONY_LIST += clienttest ################################################################ # servertest (make sure various basic java server options work) servertest: prep $(PRODUCT_HOME) $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -version $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -help $(PRODUCT_HOME)/bin/java $(JAVA_OPTIONS) -X PHONY_LIST += servertest ################################################################ # packtest # Expect JPRT to set JPRT_PACKTEST_HOME. PACKTEST_HOME = /net/jprt-web.sfbay.sun.com/jprt/allproducts/packtest ifdef JPRT_PACKTEST_HOME PACKTEST_HOME = $(JPRT_PACKTEST_HOME) endif #EXTRA_PACKTEST_OPTIONS = packtest: prep $(PACKTEST_HOME)/ptest $(PRODUCT_HOME) ( $(CD) $(PACKTEST_HOME) && \ $(PACKTEST_HOME)/ptest \ -t "$(PRODUCT_HOME)" \ $(PACKTEST_STRESS_OPTION) \ $(EXTRA_PACKTEST_OPTIONS) \ -W $(ABS_TEST_OUTPUT_DIR) \ $(JAVA_OPTIONS:%=-J %) \ ) || $(BUNDLE_UP_FAILED) $(BUNDLE_UP) packtest_stress: PACKTEST_STRESS_OPTION=-s packtest_stress: packtest PHONY_LIST += packtest packtest_stress ################################################################ # Phony targets (e.g. these are not filenames) .PHONY: all clean prep $(PHONY_LIST) ################################################################