linux-kernel - Re: [RFC][PATCH 6/8] mm: handle_speculative

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Message-ID: <alpine.DEB.2.00.1001081544260.29503@router.home>
Date:	Fri, 8 Jan 2010 15:46:26 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Peter Zijlstra <peterz@...radead.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

On Fri, 8 Jan 2010, Linus Torvalds wrote:

> We worried about the effects of fair spinlocks when introducing the ticket
> locks, but nobody ever actually had a load that seemed to indicate it made
> much of a difference, and we did have a few cases where starvation was a
> very noticeable problem.

And I made the point that starvation was a hardware issue due to immature
cacheline handling. Now the software patchup job for the hardware breakage
is causing regressions for everyone.


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