linux-kernel - Re: NMI watchdog triggering during load

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150306090731.GY21418@twins.programming.kicks-ass.net>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/