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At least FreeBSD has perl in /usr/local/bin/perl and no symlink by
default.
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slab freelists used to be malloc'ed arrays. then they were changed into a
freelist. now we pre-split newly assigned/moved pages into a slabs freelist
instead of lazily pulling pointers as needed.
The loop is pretty darn direct and I can't measure a performance impact of
this relatively rare event.
In doing this, slab reassign can move memory without having to wait for a
class to chew through its recently assigned page first.
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32bit pointers are smaller... need more items to fill the slabs, sigh.
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bad practice.
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Add human parseable strings to the errors for slabs ressign. Also prevent
reassigning memory to the same source and destination.
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Adds a "slabs reassign src dst" manual command, and a thread to safely process
slab moves in the background.
- slab freelist is now a linked list, reusing the item structure
- is -o slab_reassign is enabled, an extra background thread is started
- thread attempts to safely free up items when it's been told to move a page
from one slab to another.
-o slab_automove is stubbed.
There are some limitations. Most notable is that you cannot repeatedly move
pages around without first having items use up the memory. Slabs with newly
assigned memory work off of a pointer, handing out chunks individually. We
would need to change that to quickly split chunks for all newly assigned pages
into that slabs freelist.
Further testing is required to ensure such is possible without impacting
performance.
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