linux-kernel - Re: [patch] eventfd - revised interface and cleanups (2nd rev)

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Message-ID: <alpine.DEB.1.10.0906231538280.17001@makko.or.mcafeemobile.com>
Date:	Tue, 23 Jun 2009 15:49:53 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	avi@...hat.com, kvm@...r.kernel.org, ghaskins@...ell.com,
	Rusty Russell <rusty@...tcorp.com.au>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [patch] eventfd - revised interface and cleanups (2nd rev)

On Tue, 23 Jun 2009, Andrew Morton wrote:

> On Tue, 23 Jun 2009 14:25:05 -0700 (PDT)
> Davide Libenzi <davidel@...ilserver.org> wrote:
> 
> > On Tue, 23 Jun 2009, Andrew Morton wrote:
> > 
> > > That isn't for us to decide. Entire syscalls can be disabled in config.
> > 
> > That is not a well defined separate syscall though. It's a member/feature 
> > of the aiocb.
> 
> I don't know what this means, really.

This is the struct iocb:

struct iocb {
	...
	u_int32_t       aio_resfd;
};

And the only interface to access KAIO is io_submit().
IMO the end user perceives the KAIO functionality as the full deployment 
of the iocb struct and the io_submit() accessory.
Can code not using eventfd work in (AIO && !EVENTFD) mode? Sure.
It is a kinda confusing configuration from the end user POV IMO.



- Davide


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