Re: ext3 allocate-with-reservation latencies

[Arjan van de Ven]

>  And rw locking is much better for concurrency, so
> we might be able to hold it over the whole bitmap search rather than
> taking it and dropping it at each window advance.

rw locks only help if readers are 10x more common than writers generally
speaking. They are quite expensive locks, so they really should be used
with the utmost care. 
(if you have really long hold times the dynamics are different, but if
you have really long hold times your latency sucks too and wasn't that
what this thread was trying to fix?)

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