linux-kernel - Re: [PATCH 5/6] syslets: add generic syslets infrastructure

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Message-Id: <200801100904.46842.rusty@rustcorp.com.au>
Date:	Thu, 10 Jan 2008 09:04:45 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Zach Brown <zach.brown@...cle.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...il.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Simon Holm Thogersen <odie@...aau.dk>,
	suresh.b.siddha@...el.com
Subject: Re: [PATCH 5/6] syslets: add generic syslets infrastructure

On Thursday 10 January 2008 05:16:57 Zach Brown wrote:
> > The latter.  A ring is optimal for processing a huge number of requests,
> > but if you're really going to be firing off syslet threads all over the
> > place you're not going to be optimal anyway.  And being able to point the
> > return value to the stack or into some datastructure is way nicer to code
> > (zero setup == easy to understand and easy to convert).
>
> One of Linus' rhetorical requirements for the syslets work is that we be
> able to wait for the result without spending overhead building up state
> in some completion context.  The userland rings in the current syslet
> patches achieve that and don't seem outrageously complicated.

I'd have to read his original statement, but eventfd doesn't build up state, 
so I think it qualifies.

YA incompatible userspace notification system just doesn't excite me though.

Cheers,
Rusty.
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