linux-kernel - Re: [PATCH 2 of 4] Introduce i386 fibril scheduling

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Message-ID: <Pine.LNX.4.64.0702051121420.14453@alien.or.mcafeemobile.com>
Date:	Mon, 5 Feb 2007 11:26:23 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Zach Brown <zach.brown@...cle.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-aio@...ck.org, Suparna Bhattacharya <suparna@...ibm.com>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH 2 of 4] Introduce i386 fibril scheduling

On Mon, 5 Feb 2007, Zach Brown wrote:

> > The normal and most optimal workflow should be a user-space ring-buffer
> > of these constant-size struct async_syscall entries:
> > 
> >  struct async_syscall ringbuffer[1024];
> > 
> >  LIST_HEAD(submitted);
> >  LIST_HEAD(pending);
> >  LIST_HEAD(completed);
> 
> I strongly disagree here, and I'm hoping you're not as keen on this now --
> your reply to Matt gives me hope.
> 
> As mentioned, that they complete out-of-order leads, at least, to having
> separate submission and completion rings.  I'm not sure a submission ring
> makes any sense given the goal of processing the calls in submission and only
> creating threads if it blocks.  A simple copy of an array of these input
> structs sounds fine to me.

The "result" of one async operation is basically a cookie and a result 
code. Eight or sixteen bytes at most. IMO, before going wacko designing 
complex shared userspace-kernel result buffers, I think it'd be better 
measuring the worth-value of the thing ;)



- Davide


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