linux-kernel - Re: [3/4] kevent: AIO, aio

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Message-Id: <1154071610.13577.2.camel@frecb000686>
Date:	Fri, 28 Jul 2006 09:26:50 +0200
From:	Sébastien Dugué <sebastien.dugue@...l.net>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	Ulrich Drepper <drepper@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Suparna Bhattacharya <suparna@...ibm.com>
Subject: Re: [3/4] kevent: AIO, aio_sendfile() implementation.

On Thu, 2006-07-27 at 08:28 -0700, Badari Pulavarty wrote:
> Sébastien Dugué wrote:
> > 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.
> >
> >   
> Sebastien,
> 
> Suparna mentioned at Ulrich wants us to concentrate on kernel-side 
> support, so that he
> can look at glibc side of things (along with other work he is already 
> doing). So, if we
> can get an agreement on what kind of kernel support is needed - we can 
> focus our
> efforts on kernel side first and leave glibc enablement to capable hands 
> of Uli :)
> 

  That's fine with me. 

  Sébastien.

-- 
-----------------------------------------------------

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

  mailto:sebastien.dugue@...l.net

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

-----------------------------------------------------

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