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comparison src/share/vm/gc_interface/collectedHeap.hpp @ 14518:d8041d695d19

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Merged with jdk9/dev/hotspot changeset 3812c088b945
author twisti
date Tue, 11 Mar 2014 18:45:59 -0700
parents 096c224171c4 1e1c8d358b52
children 4ca6dc0799b6
comparison
equal deleted inserted replaced
14141:f97c5ec83832 14518:d8041d695d19
387 // The argument "retire_tlabs" controls whether existing TLABs 387 // The argument "retire_tlabs" controls whether existing TLABs
388 // are merely filled or also retired, thus preventing further 388 // are merely filled or also retired, thus preventing further
389 // allocation from them and necessitating allocation of new TLABs. 389 // allocation from them and necessitating allocation of new TLABs.
390 virtual void ensure_parsability(bool retire_tlabs); 390 virtual void ensure_parsability(bool retire_tlabs);
391 391
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) 392 // Section on thread-local allocation buffers (TLABs)
402 // If the heap supports thread-local allocation buffers, it should override 393 // If the heap supports thread-local allocation buffers, it should override
403 // the following methods: 394 // the following methods:
404 // Returns "true" iff the heap supports thread-local allocation buffers. 395 // Returns "true" iff the heap supports thread-local allocation buffers.
405 // The default is "no". 396 // The default is "no".
406 virtual bool supports_tlab_allocation() const { 397 virtual bool supports_tlab_allocation() const = 0;
407 return false; 398
408 }
409 // The amount of space available for thread-local allocation buffers. 399 // The amount of space available for thread-local allocation buffers.
410 virtual size_t tlab_capacity(Thread *thr) const { 400 virtual size_t tlab_capacity(Thread *thr) const = 0;
411 guarantee(false, "thread-local allocation buffers not supported"); 401
412 return 0; 402 // The amount of used space for thread-local allocation buffers for the given thread.
413 } 403 virtual size_t tlab_used(Thread *thr) const = 0;
404
405 virtual size_t max_tlab_size() const;
406
414 // An estimate of the maximum allocation that could be performed 407 // An estimate of the maximum allocation that could be performed
415 // for thread-local allocation buffers without triggering any 408 // for thread-local allocation buffers without triggering any
416 // collection or expansion activity. 409 // collection or expansion activity.
417 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const { 410 virtual size_t unsafe_max_tlab_alloc(Thread *thr) const {
418 guarantee(false, "thread-local allocation buffers not supported"); 411 guarantee(false, "thread-local allocation buffers not supported");