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Date: Wed, 25 Mar 2015 13:54:09 +0300
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Hans Petter Selasky <hselasky@FreeBSD.org>
Subject: Re: svn commit: r280495 - head/sys/kern
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On Wed, Mar 25, 2015 at 08:55:35AM +0000, Hans Petter Selasky wrote:
H> Author: hselasky
H> Date: Wed Mar 25 08:55:34 2015
H> New Revision: 280495
H> URL: https://svnweb.freebsd.org/changeset/base/280495
H> 
H> Log:
H>   Implement a simple OID number garbage collector. Given the increasing
H>   number of dynamically created and destroyed SYSCTLs during runtime it
H>   is very likely that the current new OID number limit of 0x7fffffff can
H>   be reached. Especially if dynamic OID creation and destruction results
H>   from automatic tests. Additional changes:
H>   
H>   - Optimize the typical use case by decrementing the next automatic OID
H>   sequence number instead of incrementing it. This saves searching time
H>   when inserting new OIDs into a fresh parent OID node.
H>   
H>   - Add simple check for duplicate non-automatic OID numbers.

Why didn't you use alloc_unr(9) for that?

-- 
Totus tuus, Glebius.