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6672698: mangle_unused_area() should not remangle the entire heap at each collection

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Maintain a high water mark for the allocations in a space and mangle only up to that high water mark.

Reviewed-by: ysr, apetrusenko
This commit is contained in:
Jon Masamitsu 2008-07-09 15:08:55 -07:00
parent 0d9452401c
commit 18dbebd143
43 changed files with 1299 additions and 206 deletions
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15
hotspot/src/share/vm/memory/defNewGeneration.hpp
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@ -279,6 +279,9 @@ protected:
virtual void gc_prologue(bool full);
virtual void gc_epilogue(bool full);
// Save the tops for eden, from, and to
virtual void record_spaces_top();
// Doesn't require additional work during GC prologue and epilogue
virtual bool performs_in_place_marking() const { return false; }
@ -299,9 +302,12 @@ protected:
// For non-youngest collection, the DefNewGeneration can contribute
// "to-space".
void contribute_scratch(ScratchBlock*& list, Generation* requestor,
virtual void contribute_scratch(ScratchBlock*& list, Generation* requestor,
size_t max_alloc_words);
// Reset for contribution of "to-space".
virtual void reset_scratch();
// GC support
virtual void compute_new_size();
virtual void collect(bool full,
@ -331,7 +337,12 @@ protected:
void verify(bool allow_dirty);
protected:
void compute_space_boundaries(uintx minimum_eden_size);
// If clear_space is true, clear the survivor spaces. Eden is
// cleared if the minimum size of eden is 0. If mangle_space
// is true, also mangle the space in debug mode.
void compute_space_boundaries(uintx minimum_eden_size,
bool clear_space,
bool mangle_space);
// Scavenge support
void swap_spaces();
};