linux-kernel - Re: NMI watchdog triggering during load

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Date:	Fri, 6 Mar 2015 10:07:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Ahern <david.ahern@...cle.com>
Cc:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: NMI watchdog triggering during load_balance

On Thu, Mar 05, 2015 at 09:05:28PM -0700, David Ahern wrote:
> Since each domain is a superset of the lower one each pass through
> load_balance regularly repeats the processing of the previous domain (e.g.,
> NODE domain repeats the cpus in the CPU domain). Then multiplying that
> across 1024 cpus and it seems like a of duplication.

It is, _but_ each domain has an interval, bigger domains _should_ load
balance at a bigger interval (iow lower frequency), and all this is
lockless data gathering, so reusing stuff from the previous round could
be quite stale indeed.
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