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comparison src/share/vm/gc_interface/collectedHeap.hpp @ 20804:7848fc12602b

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Merge with jdk8u40-b25
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Tue, 07 Apr 2015 14:58:49 +0200
parents 8f2fb6bec986 ef9eda2c1abe
children
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20184:84105dcdb05b 20804:7848fc12602b
349 } 349 }
350 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) { 350 static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) {
351 fill_with_object(start, pointer_delta(end, start), zap); 351 fill_with_object(start, pointer_delta(end, start), zap);
352 } 352 }
353 353
354 // Return the address "addr" aligned by "alignment_in_bytes" if such
355 // an address is below "end". Return NULL otherwise.
356 inline static HeapWord* align_allocation_or_fail(HeapWord* addr,
357 HeapWord* end,
358 unsigned short alignment_in_bytes);
359
354 // Some heaps may offer a contiguous region for shared non-blocking 360 // Some heaps may offer a contiguous region for shared non-blocking
355 // allocation, via inlined code (by exporting the address of the top and 361 // allocation, via inlined code (by exporting the address of the top and
356 // end fields defining the extent of the contiguous allocation region.) 362 // end fields defining the extent of the contiguous allocation region.)
357 363
358 // This function returns "true" iff the heap supports this kind of 364 // This function returns "true" iff the heap supports this kind of
387 // The argument "retire_tlabs" controls whether existing TLABs 393 // The argument "retire_tlabs" controls whether existing TLABs
388 // are merely filled or also retired, thus preventing further 394 // are merely filled or also retired, thus preventing further
389 // allocation from them and necessitating allocation of new TLABs. 395 // allocation from them and necessitating allocation of new TLABs.
390 virtual void ensure_parsability(bool retire_tlabs); 396 virtual void ensure_parsability(bool retire_tlabs);
391 397
392 // Return an estimate of the maximum allocation that could be performed
393 // without triggering any collection or expansion activity. In a
394 // generational collector, for example, this is probably the largest
395 // allocation that could be supported (without expansion) in the youngest
396 // generation. It is "unsafe" because no locks are taken; the result
397 // should be treated as an approximation, not a guarantee, for use in
398 // heuristic resizing decisions.
399 virtual size_t unsafe_max_alloc() = 0;
400
401 // Section on thread-local allocation buffers (TLABs) 398 // Section on thread-local allocation buffers (TLABs)
402 // If the heap supports thread-local allocation buffers, it should override 399 // If the heap supports thread-local allocation buffers, it should override
403 // the following methods: 400 // the following methods:
404 // Returns "true" iff the heap supports thread-local allocation buffers. 401 // Returns "true" iff the heap supports thread-local allocation buffers.
405 // The default is "no". 402 // The default is "no".
638 // only whether there more than 0. Use of this method helps 635 // only whether there more than 0. Use of this method helps
639 // reduce the occurrence of ParallelGCThreads to uses where the 636 // reduce the occurrence of ParallelGCThreads to uses where the
640 // actual number may be germane. 637 // actual number may be germane.
641 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; } 638 static bool use_parallel_gc_threads() { return ParallelGCThreads > 0; }
642 639
640 // Copy the current allocation context statistics for the specified contexts.
641 // For each context in contexts, set the corresponding entries in the totals
642 // and accuracy arrays to the current values held by the statistics. Each
643 // array should be of length len.
644 // Returns true if there are more stats available.
645 virtual bool copy_allocation_context_stats(const jint* contexts,
646 jlong* totals,
647 jbyte* accuracy,
648 jint len) {
649 return false;
650 }
651
643 /////////////// Unit tests /////////////// 652 /////////////// Unit tests ///////////////
644 653
645 NOT_PRODUCT(static void test_is_in();) 654 NOT_PRODUCT(static void test_is_in();)
646 }; 655 };
647 656