linux-kernel - Re: [patch-mm 07/23] Tick management: spread timer interrupt

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Message-Id: <1181485863.384.15.camel@chaos>
Date:	Sun, 10 Jun 2007 16:31:03 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andreas Mohr <andi@...x01.hs-esslingen.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Chris Wright <chrisw@...s-sol.org>,
	john stultz <johnstul@...ibm.com>
Subject: Re: [patch-mm 07/23] Tick management: spread timer interrupt

On Sun, 2007-06-10 at 16:16 +0200, Andreas Mohr wrote:
> Hi,
> 
> On Sun, Jun 10, 2007 at 09:44:05AM -0000, Thomas Gleixner wrote:
> > From: john stultz <johnstul@...ibm.com>
> > 
> > After discussing w/ Thomas over IRC, it seems the issue is the sched
> > tick fires on every cpu at the same time, causing extra lock contention.
> 
> Hmm, the cpu-specific offset calculation isn't too expensive, hopefully?
> (div/mul in patch, maybe this could be done differently)

That's one time during setup, no hot path.

	tglx


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