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Message-ID: <20090515122308.GA11465@sgi.com>
Date: Fri, 15 May 2009 07:23:08 -0500
From: Dimitri Sivanich <sivanich@....com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 0/2] sched, timers: simplify calc_load and avoid cpu
iteration loop
Acked-by: Dimitri Sivanich <sivanich@....com>
On Thu, May 14, 2009 at 11:21:14AM -0000, Thomas Gleixner wrote:
> Dimitri Sivanich pointed out that calc_load iterates over all online
> CPUs under xtime lock which can cause long latencies on large SMP
> systems.
>
> The following patch series removes the iteration loop and lets
> scheduler_tick() on each CPU update the number of active tasks. The
> calc_load() function just uses this variable and updates avenrun from
> do_timer().
>
> Dimitri, can you please test run this on one of your large machines ?
>
> Thanks,
>
> tglx
>
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