G1gc compaction algorithm

[Martin Makundi]

Hi!

Humongous allocation fails when there is not enough contiguous free space
in memory.

How does g1gc compaction algorithm work, does it compact only within a
region or does it attempt to compact in a whole-heap-defragmentation way?
The latter would reduce the probability of "humongous allocation failure".
And if this is possible, is there a parameter/s that can be changed to tune
this?

**
Martin
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