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comparison src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp @ 17753:191174b49bec

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8035406: Improve data structure for Code Cache remembered sets Summary: Change the code cache remembered sets data structure from a GrowableArray to a chunked list of nmethods. This makes the data structure more amenable to parallelization, and decreases freeing time. Reviewed-by: mgerdin, brutisso
author tschatzl
date Mon, 24 Mar 2014 15:30:14 +0100
parents b7e42ada4898
children 96b1c2e06e25
comparison
equal deleted inserted replaced
17750:f53edbc2b728 17753:191174b49bec
5932 // the collection set. Ideally we would like to do this 5932 // the collection set. Ideally we would like to do this
5933 // after we have finished the scanning/evacuation of the 5933 // after we have finished the scanning/evacuation of the
5934 // strong code roots for a particular heap region. 5934 // strong code roots for a particular heap region.
5935 migrate_strong_code_roots(); 5935 migrate_strong_code_roots();
5936 5936
5937 purge_code_root_memory();
5938
5937 if (g1_policy()->during_initial_mark_pause()) { 5939 if (g1_policy()->during_initial_mark_pause()) {
5938 // Reset the claim values set during marking the strong code roots 5940 // Reset the claim values set during marking the strong code roots
5939 reset_heap_region_claim_values(); 5941 reset_heap_region_claim_values();
5940 } 5942 }
5941 5943
6808 collection_set_iterate(&cl); 6810 collection_set_iterate(&cl);
6809 double migration_time_ms = (os::elapsedTime() - migrate_start) * 1000.0; 6811 double migration_time_ms = (os::elapsedTime() - migrate_start) * 1000.0;
6810 g1_policy()->phase_times()->record_strong_code_root_migration_time(migration_time_ms); 6812 g1_policy()->phase_times()->record_strong_code_root_migration_time(migration_time_ms);
6811 } 6813 }
6812 6814
6815 void G1CollectedHeap::purge_code_root_memory() {
6816 double purge_start = os::elapsedTime();
6817 G1CodeRootSet::purge_chunks(G1CodeRootsChunkCacheKeepPercent);
6818 double purge_time_ms = (os::elapsedTime() - purge_start) * 1000.0;
6819 g1_policy()->phase_times()->record_strong_code_root_purge_time(purge_time_ms);
6820 }
6821
6813 // Mark all the code roots that point into regions *not* in the 6822 // Mark all the code roots that point into regions *not* in the
6814 // collection set. 6823 // collection set.
6815 // 6824 //
6816 // Note we do not want to use a "marking" CodeBlobToOopClosure while 6825 // Note we do not want to use a "marking" CodeBlobToOopClosure while
6817 // walking the the code roots lists of regions not in the collection 6826 // walking the the code roots lists of regions not in the collection
6878 HeapRegionRemSet* hrrs = hr->rem_set(); 6887 HeapRegionRemSet* hrrs = hr->rem_set();
6879 if (hr->continuesHumongous()) { 6888 if (hr->continuesHumongous()) {
6880 // Code roots should never be attached to a continuation of a humongous region 6889 // Code roots should never be attached to a continuation of a humongous region
6881 assert(hrrs->strong_code_roots_list_length() == 0, 6890 assert(hrrs->strong_code_roots_list_length() == 0,
6882 err_msg("code roots should never be attached to continuations of humongous region "HR_FORMAT 6891 err_msg("code roots should never be attached to continuations of humongous region "HR_FORMAT
6883 " starting at "HR_FORMAT", but has "INT32_FORMAT, 6892 " starting at "HR_FORMAT", but has "SIZE_FORMAT,
6884 HR_FORMAT_PARAMS(hr), HR_FORMAT_PARAMS(hr->humongous_start_region()), 6893 HR_FORMAT_PARAMS(hr), HR_FORMAT_PARAMS(hr->humongous_start_region()),
6885 hrrs->strong_code_roots_list_length())); 6894 hrrs->strong_code_roots_list_length()));
6886 return false; 6895 return false;
6887 } 6896 }
6888 6897