Messages in this thread |  | | Date | Fri, 01 Nov 2013 08:08:00 -0400 | From | Prarit Bhargava <> | Subject | Re: [PATCH -tip] fix race between stop_two_cpus and stop_cpus |
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On 11/01/2013 07:36 AM, Rik van Riel wrote: > On 11/01/2013 07:08 AM, Mel Gorman wrote: >> On Thu, Oct 31, 2013 at 04:31:44PM -0400, Rik van Riel wrote: >>> There is a race between stop_two_cpus, and the global stop_cpus. >>> >> >> What was the trigger for this? I want to see what was missing from my own >> testing. I'm going to go out on a limb and guess that CPU hotplug was also >> running in the background to specifically stress this sort of rare condition. >> Something like running a standard test with the monitors/watch-cpuoffline.sh >> from mmtests running in parallel. > > AFAIK the trigger was a test that continuously loads and > unloads kernel modules, while doing other stuff. >
With this patch in place the module load/unload test ran for ~16 hours without failure. Without the patch the test usually fails in 5-10 minutes.
Tested-by: Prarit Bhargava <prarit@redhat.com>
P.
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