From: Peter Zijlstra <peterz@infradead.org>
To: David Ahern <david.ahern@oracle.com>
Cc: Mike Galbraith <efault@gmx.de>, Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: NMI watchdog triggering during load_balance
Date: Fri, 6 Mar 2015 10:07:31 +0100 [thread overview]
Message-ID: <20150306090731.GY21418@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <54F92788.6010007@oracle.com>
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.
next prev parent reply other threads:[~2015-03-06 9:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-06 4:05 NMI watchdog triggering during load_balance David Ahern
2015-03-06 4:52 ` Mike Galbraith
2015-03-06 15:01 ` David Ahern
2015-03-06 18:11 ` Mike Galbraith
2015-03-06 18:37 ` David Ahern
2015-03-06 19:29 ` Mike Galbraith
2015-03-10 3:06 ` David Ahern
2015-03-07 9:36 ` Peter Zijlstra
2015-03-06 8:51 ` Peter Zijlstra
2015-03-06 15:03 ` David Ahern
2015-03-06 9:07 ` Peter Zijlstra [this message]
2015-03-06 15:10 ` David Ahern
2015-03-06 9:12 ` Peter Zijlstra
2015-03-06 15:12 ` David Ahern
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