RFR(L): 8046809: vm/mlvm/meth/stress/compiler/deoptimize CodeCache is full.
nils.eliasson at oracle.com
Fri Oct 10 09:01:53 UTC 2014
Overall a very welcome change to move the sweeper into a separate thread.
On 2014-10-09 10:24, Albert Noll wrote:
> The patch also removes CodeCacheMinimumFreeSpace and 'critical' code
> cache allocations. Due to a bug in
> heap.cpp, the CodeCacheMinimumFreeSpace was in fact not reserved for
> 'critical' allocations. The following
> lines produce an underflow if heap_unallocated_capacity() <
> segments_to_size(number_of_segments) > (heap_unallocated_capacity() -
> Since the critical part in the code cache was never used for its
> intended purpose and we did not have problems
> due to that, we can remove it.
Are you sure? The reasons for the CodeCacheMinimumFreeSpace and critical
allocations where problems with code cache fragmentation in long running
applications, where small compilations would starve out the adaptors and
cause VM shutdown. You won't see this other than in the really long
running tests. It might be broken - but then we should open a bug and
fix it. (And in the long run we should handle the fragmentation with
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