linux-kernel - Re: [PATCH 3/7] barrier: a scalable synchonisation barrier

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Message-ID: <20070128143941.GA16552@infradead.org>
Date:	Sun, 28 Jan 2007 14:39:41 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 3/7] barrier: a scalable synchonisation barrier

On Sun, Jan 28, 2007 at 12:51:21PM +0100, Peter Zijlstra wrote:
> This barrier thing is constructed so that it will not write in the sync()
> condition (the hot path) when there are no active lock sections; thus avoiding
> cacheline bouncing. -- I'm just not sure how this will work out in relation to
> PI. We might track those in the barrier scope and boost those by the max prio
> of the blockers.

Is this really needed?  We seem to grow new funky locking algorithms
exponentially, while people already have a hard time understanding
the existing ones.

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