Messages in this thread | | | From | Christian Borntraeger <> | Subject | Re: [PATCH] Limit number of concurrent hotplug processes | Date | Mon, 26 Jul 2004 08:19:36 +0200 |
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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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