Kristian Høgsberg 1103a1a484 window: Use a persistent, big shm pool during resize
The biggest performance bottleneck while resizing is the continous
setting up and tearing down of mmaps and faulting in pages.  This commit
introduces a per-window pool that we'll allocate buffers out of if it's
available.  Then we set initialize it to a big shm pool when we start
resizing and free it when resizing is done.
2012-04-03 12:00:48 -04:00
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