From: Christian Borntraeger <linux-kernel@borntraeger.net>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@osdl.org>, Hannes Reinecke <hare@suse.de>,
linux-hotplug-devel@lists.sourceforge.net
Subject: Re: [PATCH] Limit number of concurrent hotplug processes
Date: Mon, 26 Jul 2004 06:19:36 +0000 [thread overview]
Message-ID: <200407260819.36739.linux-kernel@borntraeger.net> (raw)
In-Reply-To: <20040725182006.6c6a36df.akpm@osdl.org>
Andrew Morton wrote:
> Hannes Reinecke <hare@suse.de> wrote:
> > the attached patch limits the number of concurrent hotplug processes.
> hm, it's a bit sad that this happens. Are you able to tell us more about
> what is causing such an explosion of module probes?
I dont know exactly which scenario Hannes has seen, but its quite simple to
trigger this scenario with almost any s390/zSeries.
Using the Hardware Management Console or z/VM you are able to hotplug
(deactive/activate/attach/detach) almost every channel path. As a channel
path can connect a big bunch of devices lots of machine checks are
triggered, which causes lots of hotplugs. The same amount of machine checks
could happen if a hardware failure happens.
Some month ago I played around with a diet version of hotplug. This program
was fast and small enough to make my scenario work properly. Nevertheless,
as hannes already stated this will only delay the problem.
cheers
Christian
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next prev parent reply other threads:[~2004-07-26 6:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-20 13:52 [PATCH] Limit number of concurrent hotplug processes Hannes Reinecke
2004-07-26 1:20 ` Andrew Morton
2004-07-26 6:19 ` Christian Borntraeger [this message]
2004-07-26 10:59 ` Hannes Reinecke
2004-07-26 20:18 ` Andrew Morton
2004-07-27 7:04 ` Hannes Reinecke
2004-07-27 7:24 ` Andrew Morton
2004-07-27 7:59 ` Hannes Reinecke
2004-07-27 8:34 ` Andrew Morton
2004-07-27 9:05 ` Hannes Reinecke
2004-07-27 9:28 ` Andrew Morton
2004-07-27 12:22 ` Hannes Reinecke
2004-07-28 7:12 ` Paul Jackson
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