linux-kernel - Re: [PATCH] Replace completions with semaphores

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Message-ID: <alpine.LFD.1.00.0804150907080.2879@woody.linux-foundation.org>
Date:	Tue, 15 Apr 2008 09:09:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Bart Van Assche <bart.vanassche@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland Dreier <rdreier@...co.com>, Ingo Molnar <mingo@...e.hu>,
	Matthew Wilcox <matthew@....cx>,
	Ingo Oeser <ioe-lkml@...eria.de>,
	Daniel Walker <dwalker@...sta.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Replace completions with semaphores



On Tue, 15 Apr 2008, Peter Zijlstra wrote:
> 
> That sounds horrible; I really prefer targeted replacements like
> completions that make it clear what they're supposed to be used for.

I agree. I'd rather _keep_ the completions, and get rid of the semaphores, 
so I think the whole fundamental patch here under discussion is broken.

We should do:
 - continue replacing semaphores that are used purely for mutual exclusion 
   with mutexes.
 - probably add support for completions to do counting
 - and then eventually just do the _reverse_ of what the current patch 
   does, namely replace the existing counting semaphore usage with 
   completions.

Hmm?

		Linus
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