linux-kernel - Re: [PATCH 5/6] mm: stop ptlock enlarging struct page

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Message-ID: <Pine.LNX.4.64.0911102227080.7826@sister.anvils>
Date:	Tue, 10 Nov 2009 22:29:28 +0000 (GMT)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Izik Eidus <ieidus@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 5/6] mm: stop ptlock enlarging struct page

On Tue, 10 Nov 2009, Peter Zijlstra wrote:
> 
> fwiw, in -rt we carry this, because there spinlock_t is huge even
> without lockdep.

Thanks, I may want to consider that; but I'm not keen on darting
off to another cacheline even for the non-debug spinlock case.

Hugh
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