linux-kernel - Re: [patch 13/13] signal/timer/event fds v9

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Date:	Sun, 01 Apr 2007 21:42:23 +0300
From:	Avi Kivity <avi@...o.co.il>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Zach Brown <zach.brown@...cle.com>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [patch 13/13] signal/timer/event fds v9 - KAIO eventfd support
 example ...

Davide Libenzi wrote:
> On Sun, 1 Apr 2007, Avi Kivity wrote:
>
>   
>> What is the motivation for adding aio_resfd to an individual iocb instead of
>> the entire io context?  It seems redundant, as you can already create multiple
>> io contexts to wait on.
>>     
>
> To add it to the context, you need to either change the context create API 
> (I think no-go here), or add a new syscall just to handle that.
> Doing it in the iocb gives finer grained setup, but can be more work for 
> the user that wants to use it for all the iocbs.
>   

I think it's a bit too fine grained, and a new system call 
(io_bindfd()?) would be easier to use.  In addition, you would move the 
eventfd_fget() out of the submission path.

For the users that want fine grained control, they can already call 
io_setup() multiple times and submit iocbs to different completion rings.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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