Mercurial > hg > truffle
diff src/share/vm/memory/generation.hpp @ 1145:e018e6884bd8
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 |
line wrap: on
line diff
--- a/src/share/vm/memory/generation.hpp Wed Dec 16 15:12:51 2009 -0800 +++ b/src/share/vm/memory/generation.hpp Wed Dec 23 09:23:54 2009 -0800 @@ -181,6 +181,12 @@ virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes, bool younger_handles_promotion_failure) const; + // For a non-young generation, this interface can be used to inform a + // generation that a promotion attempt into that generation failed. + // Typically used to enable diagnostic output for post-mortem analysis, + // but other uses of the interface are not ruled out. + virtual void promotion_failure_occurred() { /* does nothing */ } + // Return an estimate of the maximum allocation that could be performed // in the generation without triggering any collection or expansion // activity. It is "unsafe" because no locks are taken; the result