[PATCH v3] lib/idr.c rewrite, percpu ida/tag allocator

[Kent Overstreet]

Previous posting: http://thread.gmane.org/gmane.linux.kernel/1511216

The only real change since the last version is that I've reworked the
new ida implementation to not use one giant allocation - it's still
logically one big arary, but it's implemented as an array of arrays.

With that, it scales up to INT_MAX allocated ids just fine. Benchmarks
are included in that patch.

Patch series is available in my git repo:
git://evilpiepirate.org/~kent/linux-bcache.git idr

Andrew, want to pick this up for 3.12?

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