Re: [PATCH] Use extents for recording what swap is allocated.

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> Switch from bitmaps to using extents to record what swap is allocated;
> they make more efficient use of memory, particularly where the allocated
> storage is small and the swap space is large.

> This is also part of the ground work for implementing support for
> supporting multiple swap devices.

bitmaps were more efficient and longer than original code... I did not
_like_ them, but they are in now. I'd hate to change the code again,
for what, 0.5% gain?

...and this is still longer than bitmaps.

And SNAPSHOT_GET_SWAP_PAGE seems to support multiple swap spaces
(cesky, pictures)
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