linux-kernel - Re: [PATCH] atomic: add atomic_inc_not_zero

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Message-ID: <alpine.DEB.2.00.1011150756130.19175@router.home>
Date:	Mon, 15 Nov 2010 07:57:10 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <npiggin@...nel.dk>
Subject: Re: [PATCH] atomic: add atomic_inc_not_zero_hint()

On Sat, 13 Nov 2010, Paul E. McKenney wrote:

> On Fri, Nov 12, 2010 at 01:14:12PM -0600, Christoph Lameter wrote:
> >
> > prefetchw() would be too much overhead?
>
> No idea.  Where do you believe that prefetchw() should be added?

It is another way to get an exclusive cache line
for situations like this. No need to give a hint.

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