lkml.org 
[lkml]   [2004]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH] Limit number of concurrent hotplug processes
Date
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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:04    [W:2.937 / U:0.540 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site