Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/g1/g1MMUTracker.cpp @ 1594:b9bc732be7c0
Merge
author | jmasa |
---|---|
date | Thu, 10 Jun 2010 08:27:35 -0700 |
parents | c18cbe5936b8 f16f1d7893de |
children | f95d63e2154a |
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--- a/src/share/vm/gc_implementation/g1/g1MMUTracker.cpp Wed Jun 09 13:53:58 2010 -0400 +++ b/src/share/vm/gc_implementation/g1/g1MMUTracker.cpp Thu Jun 10 08:27:35 2010 -0700 @@ -81,20 +81,24 @@ remove_expired_entries(end); if (_no_entries == QueueLength) { - // OK, right now when we fill up we bomb out - // there are a few ways of dealing with this "gracefully" + // OK, we've filled up the queue. There are a few ways + // of dealing with this "gracefully" // increase the array size (:-) // remove the oldest entry (this might allow more GC time for - // the time slice than what's allowed) + // the time slice than what's allowed) - this is what we + // currently do // consolidate the two entries with the minimum gap between them // (this might allow less GC time than what's allowed) - guarantee(NOT_PRODUCT(ScavengeALot ||) G1UseFixedWindowMMUTracker, - "array full, currently we can't recover unless +G1UseFixedWindowMMUTracker"); + // In the case where ScavengeALot is true, such overflow is not // uncommon; in such cases, we can, without much loss of precision // or performance (we are GC'ing most of the time anyway!), - // simply overwrite the oldest entry in the tracker: this - // is also the behaviour when G1UseFixedWindowMMUTracker is enabled. + // simply overwrite the oldest entry in the tracker. + + if (G1PolicyVerbose > 1) { + warning("MMU Tracker Queue overflow. Replacing earliest entry."); + } + _head_index = trim_index(_head_index + 1); assert(_head_index == _tail_index, "Because we have a full circular buffer"); _tail_index = trim_index(_tail_index + 1);