Re: [3/4] kevent: AIO, aio_sendfile() implementation.

Sébastien Dugué
2006-07-27T06:49:28Z

On Wed, 2006-07-26 at 09:22 -0700, Badari Pulavarty wrote:
> Ulrich Drepper wrote:
> > Christoph Hellwig wrote:
> >
> >>> My personal opinion on existing AIO is that it is not the right design.
> >>> Benjamin LaHaise agree with me (if I understood him right),
> >>>
> >> I completely agree with that aswell.
> >>
> >
> > I agree, too, but the current code is not the last of the line. Suparna
> > has a st of patches which make the current kernel aio code work much
> > better and especially make it really usable to implement POSIX AIO.
> >
> > In Ottawa we were talking about submitting it and Suparna will. We just
> > thought about a little longer timeframe. I guess it could be
> > accelerated since he mostly has the patch done. But I don't know her
> > schedule.
> >
> > Important here is, don't base any decision on the current aio
> > implementation.
> >
> Ulrich,
>
> Suparna mentioned your interest in making POSIX glibc aio work with
> kernel-aio at OLS.
> We thought taking a re-look at the (kernel side) work BULL did, would be
> a nice starting
> point. I re-based those patches to 2.6.18-rc2 and sent it to Zach Brown
> for review before
> sending them out to list.
>
> These patches does NOT make AIO any cleaner. All they do is add
> functionality to support
> POSIX AIO easier. These are
>
> [ PATCH 1/3 ] Adding signal notification for event completion
>
> [ PATCH 2/3 ] lio (listio) completion semantics
>
> [ PATCH 3/3 ] cancel_fd support

Badari,

Thanks for refreshing those patches, they have been sitting here
for quite some time now and collected dust.

I also think Suparna's patchset for doing buffered AIO would be
a real plus here.

>
> Suparna explained these in the following article:
>
> http://lwn.net/Articles/148755/
>
> If you think, this is a reasonable direction/approach for the kernel and
> you would take care
> of glibc side of things - I can spend time on these patches, getting
> them to reasonable shape
> and push for inclusion.

Ulrich, I you want to have a look at how those patches are put to
use in libposix-aio, have a look at http://sourceforge.net/projects/paiol.

It could be a starting point for glibc.

Thanks,

Sébastien.

--
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Sébastien Dugué BULL/FREC:B1-247
phone: (+33) 476 29 77 70 Bullcom: 229-7770

mailto:sebastien.dugue@bull.net

Linux POSIX AIO: http://www.bullopensource.org/posix
http://sourceforge.net/projects/paiol

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