RFR: 8191471: Elastic TLABs for G1
stefan.johansson at oracle.com
Mon Apr 23 12:57:24 UTC 2018
Please review these changes to lower the waste in G1 mutator regions.
G1 might waste excessive amount of memory due to allocations that would
span region boundaries. To lower this waste this patch addresses this
problem in two ways. TLAB allocations are now more flexible allowing the
size to be less then the desired amount as long as the allocation will
fit in the TLAB (defined by min_word_size in the call).
The G1 allocation code also tries to minimize the waste by keeping two
active allocation regions so that a single large allocation won't cause
waste that could have been used for other allocations.
Functional testing through mach5 with hs-tier 1-3 and jdk-tier 1-3.
Performance testing locally and through aurora without seeing any
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