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

From: Davide Libenzi
Date: Tue Jun 23 2009 - 18:56:19 EST

On Tue, 23 Jun 2009, Andrew Morton wrote:

> On Tue, 23 Jun 2009 14:25:05 -0700 (PDT)
> Davide Libenzi <davidel@xxxxxxxxxxxxxxx> 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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