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Realizing that long-lived objects will eventually float to the bottom
of the heap, I added a simple hack to the collector that 'remembers'
the top of the heap the last time a full collect was run and then runs
incremental collects looking to shift only objects above that
boundary. That doesn't perfectly capture the bounds of transient
objects, but does manage to reduce the amount of time spent not moving
persistent objects each time through the collector.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Track freed cons cells and stack items from the eval process where
possible so that they can be re-used without needing to collect.
This dramatically reduces the number of collect calls.
Signed-off-by: Keith Packard <keithp@keithp.com>
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The CRC is actually of the ROM bits, so we can tell if the restored
image relates to the currently running code.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This sticks a few globals past the end of the heap and then asks the
OS to save the heap. On restore, the heap is re-populated by the OS
and then various global variables reset.
Signed-off-by: Keith Packard <keithp@keithp.com>
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