linux-kernel - Re: idr_get_new

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Message-ID: <4C9B3E15.5080002@gmail.com>
Date:	Thu, 23 Sep 2010 13:46:29 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
CC:	Roland Dreier <rdreier@...co.com>,
	Ohad Ben-Cohen <ohad@...ery.com>, linux-kernel@...r.kernel.org,
	"Jean Delvare (PC drivers, core)" <khali@...ux-fr.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Roland Dreier <rolandd@...co.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Steve Wise <swise@...lsio.com>, Neil Brown <neilb@...e.de>,
	Paul Mackerras <paulus@...ba.org>, linux-i2c@...r.kernel.org,
	linux-rdma@...r.kernel.org, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, linux-ppp@...r.kernel.org,
	netdev@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Alasdair G Kergon <agk@...hat.com>
Subject: Re: idr_get_new_exact ?

Hello,

On 09/23/2010 01:42 PM, Paul Mundt wrote:
> On Mon, Sep 20, 2010 at 11:26:47PM +0200, Tejun Heo wrote:
>> Hello,
>>
>> On 09/20/2010 10:35 PM, Roland Dreier wrote:
>>> Looks fine to me as an improvement over the status quo, but I wonder how
>>> many of these places could use the radix_tree stuff instead?  If you're
>>> not using the ability of the idr code to assign an id for you, then it
>>> seems the radix_tree API is a better fit.
>>
>> I agree.  Wouldn't those users better off simply using radix tree?
>>
> It could go either way. I was about to write the same function when
> playing with it for IRQ mapping, the idea being to propagate the initial
> tree with sparse static vectors and then switch over to dynamic IDs for
> virtual IRQ creation. I ended up going with a radix tree for other
> reasons, though.

I see.  If there are use cases where fixed and dynamic IDs need to be
mixed, no objection from me.

Thanks.

-- 
tejun
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