linux-kernel - Re: v6: faster tree-based sysctl implementation

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Message-ID: <CAJL_dMtvgnZHH0uLE3j7Mg2Xqwt2rd90Uy0pUxm6muPmjFbkQg@mail.gmail.com>
Date:	Wed, 7 Dec 2011 01:42:58 +0200
From:	Anca Emanuel <anca.emanuel@...il.com>
To:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Cc:	"Eric W . Biederman" <ebiederm@...ssion.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org, Octavian Purdila <tavi@...pub.ro>,
	"David S . Miller" <davem@...emloft.net>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Damien Millescamps <damien.millescamps@...nd.com>
Subject: Re: v6: faster tree-based sysctl implementation

On Tue, Dec 6, 2011 at 4:33 PM, Lucian Adrian Grijincu
<lucian.grijincu@...il.com> wrote:
> Sysctl uses a slow algorithm: O(N^2) for insertions, O(N) for lookup,
> with a relatively big constant.
> The performance is acceptable when N is small, but sometimes it can
> grow to bigger values.
> One case where N can grow to very large values is when you add network
> interfaces.
>
[snip]
>
> This algorithm is O(N * logN) for insert and O(logN) for lookup.
>
>
>> You add more code. This is not good. If you reduce the code, then it
>> will be interesting.
>
> Thank you. I know that, but it's easier said than done. I'd welcome
> some feedback in what could be simplified in my patches :)

>From an "airplane view" you can make the algorithms generic, and find
other places in kernel that can use them.
If you do that, I am sure you will get the attention.
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