linux-kernel - Re: [PATCH 2/2] x86: get more exact nr

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Message-ID: <4B4241E2.1020008@zytor.com>
Date:	Mon, 04 Jan 2010 11:30:42 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	NetDEV list <netdev@...r.kernel.org>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>
Subject: Re: [PATCH 2/2] x86: get more exact nr_irqs

On 01/04/2010 11:16 AM, Eric W. Biederman wrote:
> 
> If we care about memory use efficiency let's replace irq_desc_ptrs
> with a rbtree or a radix_tree.  Something that moves the memory use
> penalty onto those machines that have a lot of irqs.
> 

rbtree doesn't make much sense for something that is addressed by index,
and doesn't need to answer questions of the form "give me the highest
member <= X".  A hash table or radix tree makes sense, depending on the
expected sparseness of the index.

	-hpa

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