linux-kernel - Re: [RFC 0/2] new kfifo API

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Message-ID: <4A77132A.4080005@cs.wisc.edu>
Date:	Mon, 03 Aug 2009 11:41:14 -0500
From:	Mike Christie <michaelc@...wisc.edu>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Stefani Seibold <stefani@...bold.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	open-iscsi@...glegroups.com
Subject: Re: [RFC 0/2] new kfifo API

On 08/03/2009 09:42 AM, Arnd Bergmann wrote:
> On Monday 03 August 2009, Stefani Seibold wrote:
>> This is a proposal of a new generic kernel FIFO implementation.
>>
>> The current kernel fifo API is not very widely used, because it has to many
>> constrains. Only 13 files in the current 2.6.30 used it. FIFO's are
>> like list are a very basic thing and a kfifo API which handles the most use
>> case would save a lot of time and memory resources.
>>
>> I think there are the following reasons why kfifo is not in use.
>>
>> - There is a need of a spinlock despite you need it or not
>> - A fifo can only allocated dynamically
>> - There is no support for data records inside a fifo
>> - The FIFO size can only a power of two


For iscsi, the only thing we have not liked with the current code is 
having to have the fifo a power of 2. It has not been that big a deal 
though.
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