Mercurial > hg > truffle

comparison src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 1387:0bfd3fb24150

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit. Summary: Ensure a full GC that clears SoftReferences before throwing an out-of-memory Reviewed-by: ysr, jcoomes
author jmasa
date Tue, 13 Apr 2010 13:52:10 -0700
parents bda703475ded
children 7666957bc44d
comparison
equal deleted inserted replaced
1361:6b73e879f1c2 1387:0bfd3fb24150
1 /* 1 /*
2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. 2 * Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
918 } 918 }
919 919
920 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); 920 assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint");
921 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread"); 921 assert(Thread::current() == VMThread::vm_thread(), "should be in vm thread");
922 922
923 const bool do_clear_all_soft_refs = clear_all_soft_refs ||
924 collector_policy()->should_clear_all_soft_refs();
925
926 ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy());
927
923 { 928 {
924 IsGCActiveMark x; 929 IsGCActiveMark x;
925 930
926 // Timing 931 // Timing
927 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); 932 gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
928 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); 933 TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
929 TraceTime t(full ? "Full GC (System.gc())" : "Full GC", PrintGC, true, gclog_or_tty); 934 TraceTime t(full ? "Full GC (System.gc())" : "Full GC",
935 PrintGC, true, gclog_or_tty);
930 936
931 TraceMemoryManagerStats tms(true /* fullGC */); 937 TraceMemoryManagerStats tms(true /* fullGC */);
932 938
933 double start = os::elapsedTime(); 939 double start = os::elapsedTime();
934 g1_policy()->record_full_collection_start(); 940 g1_policy()->record_full_collection_start();
983 989
984 // Temporarily clear _is_alive_non_header 990 // Temporarily clear _is_alive_non_header
985 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL); 991 ReferenceProcessorIsAliveMutator rp_is_alive_null(ref_processor(), NULL);
986 992
987 ref_processor()->enable_discovery(); 993 ref_processor()->enable_discovery();
988 ref_processor()->setup_policy(clear_all_soft_refs); 994 ref_processor()->setup_policy(do_clear_all_soft_refs);
989 995
990 // Do collection work 996 // Do collection work
991 { 997 {
992 HandleMark hm; // Discard invalid handles created during gc 998 HandleMark hm; // Discard invalid handles created during gc
993 G1MarkSweep::invoke_at_safepoint(ref_processor(), clear_all_soft_refs); 999 G1MarkSweep::invoke_at_safepoint(ref_processor(), do_clear_all_soft_refs);
994 } 1000 }
995 // Because freeing humongous regions may have added some unclean 1001 // Because freeing humongous regions may have added some unclean
996 // regions, it is necessary to tear down again before rebuilding. 1002 // regions, it is necessary to tear down again before rebuilding.
997 tear_down_region_lists(); 1003 tear_down_region_lists();
998 rebuild_region_lists(); 1004 rebuild_region_lists();
1205 result = attempt_allocation(word_size, /*permit_collection_pause*/false); 1211 result = attempt_allocation(word_size, /*permit_collection_pause*/false);
1206 if (result != NULL) { 1212 if (result != NULL) {
1207 assert(is_in(result), "result not in heap"); 1213 assert(is_in(result), "result not in heap");
1208 return result; 1214 return result;
1209 } 1215 }
1216
1217 assert(!collector_policy()->should_clear_all_soft_refs(),
1218 "Flag should have been handled and cleared prior to this point");
1210 1219
1211 // What else? We might try synchronous finalization later. If the total 1220 // What else? We might try synchronous finalization later. If the total
1212 // space available is large enough for the allocation, then a more 1221 // space available is large enough for the allocation, then a more
1213 // complete compaction phase than we've tried so far might be 1222 // complete compaction phase than we've tried so far might be
1214 // appropriate. 1223 // appropriate.