linux-kernel - Re: [RFC] time: xtime

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Message-ID: <20110506175051.GL11636@one.firstfloor.org>
Date:	Fri, 6 May 2011 19:50:51 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC] time: xtime_lock is held too long

On Fri, May 06, 2011 at 07:42:47PM +0200, Eric Dumazet wrote:
> Le vendredi 06 mai 2011 à 18:59 +0200, Andi Kleen a écrit :
> 
> > If you have a better way to make it faster please share it.
> 
> Ideally we could use RCU :)

Hmm, I didn't think my case had a lot of loops in the seqlock -- just
expensive cache misses -- but I should double check.

For the lots of loop case we probably need to understand first why you
iterate that often.

-Andi
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