linux-kernel - Re: [patch 05/11] syslets: core code

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Date:	Wed, 14 Feb 2007 22:35:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 05/11] syslets: core code


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> But the whole point is that the notion of a "register" is wrong in the 
> first place. [...]

forget about it then. The thing we "register" is dead-simple:

 struct async_head_user {
         struct syslet_uatom __user              **completion_ring;
         unsigned long                           ring_size_bytes;
         unsigned long                           max_nr_threads;
 };

this can be passed in to sys_async_exec() as a second pointer, and the 
kernel can put the expected-completion pointer (and the user ring idx 
pointer) into its struct atom. It's just a few instructions, and only in 
the cachemiss case.

that would make completions arbitrarily split-up-able. No registration 
whatsoever. A waiter could specify which ring's events it is interested 
in. A 'ring' could be a single-entry thing as well, for a single 
instance of pending IO.

	Ingo
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