linux-kernel - Re: [PATCH] [0/6] kfifo fixes/improvements

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Date:	Tue, 29 Dec 2009 20:18:50 -0500
From:	Vikram Dhillon <dhillonv10@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Stefani Seibold <stefani@...bold.net>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...l.org" <akpm@...l.org>
Subject: Re: [PATCH] [0/6] kfifo fixes/improvements

IMHO you can process elements rather than bytes, which is a good
improvement, but then again its my opinion, if others don't like it
then we can always change it :D

Regards,
Vikram Dhillon

~~~
There are lots of Linux users who don't care how the kernel works, but
only want to use it. That is a tribute to how good Linux is.
-- Linus Torvalds



On Tue, Dec 29, 2009 at 5:27 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On Dec 29, 2009, at 12:40 AM, Stefani Seibold <stefani@...bold.net> wrote:
>
>> Am Montag, den 28.12.2009, 21:40 +0100 schrieb Andi Kleen:
>>
>>
>>> OK i checked and they all use power-of-two currently so by sheer
>>> luck (I doubt it is by design) they work. Still I think that
>>> open deathtrap should be fixed.
>>>
>>
>> It is fixed, and i hope it will be included in 2.6.34.
>>
>>> I also don't understand how that patch "breaks your future work"
>>> Please elaborate on that.
>>>
>>
>> Very difficult to explain in a email, but i will try it:
>>
>> The new macro based kfifo API handles everything as elements of a given
>> type. So you can have the old "unsigned char"-fifo, but also fifo of
>> every other type like int's, struct's and so on. The kfifo_in() and
>> kfifo_out() len parameter is than in the meaning of elements not bytes.
>> So you are able to process more than one value at a time and the macros
>> will return the number of processed elements (not bytes).
>
> Does anyone want this kind of functionality though? Why can't we keep the
> old interface as is (and maybe deprecate it) and use the new record API you
> mentioned below for record-oriented kfifos.
>
> Thanks.
>
> --
> Dmitry
>
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