I went ahead and implemented both of these pieces. See
https://github.com/ceph/ceph/pull/5534
My benchmark numbers are highly suspect, but the approximate takeaway
is that it's 2x faster for the simple microbenchmarks and does 1/3rd the
allocations. But there is some weird interaction with the allocator going
on for 16k allocations that I saw, so it needs some more careful
benchmarking.
The other interesting thing is that either of these pieces in isolation
seems to have a pretty decent benefit, but when combined the benefits are
fully additive.
It seems to be reasonably stable, though!
sage
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