Mercurial > hg > truffle
diff src/share/vm/memory/genCollectedHeap.cpp @ 263:12eea04c8b06
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
Summary: Maintain a high water mark for the allocations in a space and mangle only up to that high water mark.
Reviewed-by: ysr, apetrusenko
author | jmasa |
---|---|
date | Wed, 09 Jul 2008 15:08:55 -0700 |
parents | ba764ed4b6f2 |
children | 850fdf70db2b |
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--- a/src/share/vm/memory/genCollectedHeap.cpp Fri Jun 27 19:12:11 2008 -0700 +++ b/src/share/vm/memory/genCollectedHeap.cpp Wed Jul 09 15:08:55 2008 -0700 @@ -465,6 +465,11 @@ _gens[i]->stat_record()->invocations++; _gens[i]->stat_record()->accumulated_time.start(); + // Must be done anew before each collection because + // a previous collection will do mangling and will + // change top of some spaces. + record_gen_tops_before_GC(); + if (PrintGC && Verbose) { gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, i, @@ -1058,6 +1063,12 @@ return res; } +void GenCollectedHeap::release_scratch() { + for (int i = 0; i < _n_gens; i++) { + _gens[i]->reset_scratch(); + } +} + size_t GenCollectedHeap::large_typearray_limit() { return gen_policy()->large_typearray_limit(); } @@ -1285,6 +1296,24 @@ always_do_update_barrier = UseConcMarkSweepGC; }; +#ifndef PRODUCT +class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { + private: + public: + void do_generation(Generation* gen) { + gen->record_spaces_top(); + } +}; + +void GenCollectedHeap::record_gen_tops_before_GC() { + if (ZapUnusedHeapArea) { + GenGCSaveTopsBeforeGCClosure blk; + generation_iterate(&blk, false); // not old-to-young. + perm_gen()->record_spaces_top(); + } +} +#endif // not PRODUCT + class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { public: void do_generation(Generation* gen) {