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

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Message-ID: <20070203092540.GH16722@waste.org>
Date:	Sat, 3 Feb 2007 03:25:40 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Zach Brown <zach.brown@...cle.com>,
	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 Sat, Feb 03, 2007 at 09:23:08AM +0100, Ingo Molnar 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);

It's wrong to call this a ring buffer as things won't be completed in
any particular order. So you'll need a fourth list head for which
buffer elements are free. At which point, you might as well leave it
entirely up to the application to manage the allocation of
async_syscall structs. It may know it only needs two, or ten thousand,
or five per client...

-- 
Mathematics is the supreme nostalgia of our time.
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