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Date:      Fri, 27 Apr 2001 10:10:13 -0600 (MDT)
From:      Nate Williams <nate@yogotech.com>
To:        Matt Dillon <dillon@earth.backplane.com>
Cc:        "David O'Brien" <obrien@FreeBSD.ORG>, Julian Elischer <julian@elischer.org>, Arch@FreeBSD.ORG, Daniel Eischen <eischen@vigrid.com>
Subject:   Re: KSE threading support (first parts)
Message-ID:  <15081.39397.944224.776391@nomad.yogotech.com>
In-Reply-To: <200104270015.f3R0FAi62512@earth.backplane.com>
References:  <3AE71067.FF4BD029@elischer.org> <20010425110940.L1790@fw.wintelcom.net> <3AE85776.92D6BD90@elischer.org> <20010426120630.A92915@dragon.nuxi.com> <200104270015.f3R0FAi62512@earth.backplane.com>

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> :Uh people.  
> :
> :We really, really NEED to agree on the design here.  Jason's paper
> :(http://people.freebsd.org/~jasone/refs/freebsd_kse/freebsd_kse.html) is
> :explains all this.
> :
> :Before any more work is done on KSE's I really feel people should either
> :agree fully with the paper, or debate its contents first.
> :
> :I really doubt a single person will develop KSE, so it is imperative
> :there is a common sheet of music.
> :
> :-- 
> :-- David  (obrien@FreeBSD.org)
> 
>     I've read it.  I was under the impression from prior discussions that
>     KSEs belonging to the same process had to be serialized... that you
>     couldn't run them concurrently with each other.

What's the point of SMP then?  This would give us essentially a
'single-threaded' process, since only one thread/process can be running
at any one point in time.  Arguable, this is still better than the
current situation where if a thread blocks, the entire process blocks,
but if we've got an idle CPU, why not allow another thread run in a
second KSE on the idle processor?

>     I can't imagine how 
>     we could possibly run KSEs belonging to the same process concurrently
>     anyway.

Think 'multi-threaded' applications.  It's trivial to design a program
where multiple threads are independant of one another.




Nate

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