Re: [PATCHSET] idr: implement idr_alloc() and convert existing users

[Tejun Heo]

On Tue, Mar 26, 2013 at 09:33:51AM -0700, Tejun Heo wrote:
> not be too bad.  The optimal would be bitmap + hashtable, I suppose.

Oops, with more restricted (or at least dynamically adjusted) ID
space, that is.

The problem with idr is that it can get pretty wasteful if the IDs
become very scattered - the worst case being one ID per each idr_layer
(the internal allocation block).  That said, even cyclic allocation
should yield somewhat clustered IDs, so I don't think it'd be too bad.

Thanks.

-- 
tejun
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