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

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Message-ID: <1304710003.2821.0.camel@edumazet-laptop>
Date:	Fri, 06 May 2011 21:26:43 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	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

Le vendredi 06 mai 2011 à 19:50 +0200, Andi Kleen a écrit :
> 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.

Yep, I'll try to investigate on this

Thanks !


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