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comparison src/share/vm/memory/generation.hpp @ 1145:e018e6884bd8

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6631166: CMS: better heuristics when combatting fragmentation Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking. Reviewed-by: jmasa
author ysr
date Wed, 23 Dec 2009 09:23:54 -0800
parents 0fbdb4381b99
children c18cbe5936b8
comparison
equal deleted inserted replaced
1111:44f61c24ddab 1145:e018e6884bd8
179 // is true if the younger generation handles a promotion 179 // is true if the younger generation handles a promotion
180 // failure. 180 // failure.
181 virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes, 181 virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes,
182 bool younger_handles_promotion_failure) const; 182 bool younger_handles_promotion_failure) const;
183 183
184 // For a non-young generation, this interface can be used to inform a
185 // generation that a promotion attempt into that generation failed.
186 // Typically used to enable diagnostic output for post-mortem analysis,
187 // but other uses of the interface are not ruled out.
188 virtual void promotion_failure_occurred() { /* does nothing */ }
189
184 // Return an estimate of the maximum allocation that could be performed 190 // Return an estimate of the maximum allocation that could be performed
185 // in the generation without triggering any collection or expansion 191 // in the generation without triggering any collection or expansion
186 // activity. It is "unsafe" because no locks are taken; the result 192 // activity. It is "unsafe" because no locks are taken; the result
187 // should be treated as an approximation, not a guarantee, for use in 193 // should be treated as an approximation, not a guarantee, for use in
188 // heuristic resizing decisions. 194 // heuristic resizing decisions.