|Summary:||khugepaged: gets stuck when writing to USB flash, 2.6.38-rc2|
|Product:||Drivers||Reporter:||Maciej Rutecki (maciej.rutecki)|
|Component:||USB||Assignee:||Greg Kroah-Hartman (greg)|
|Severity:||normal||CC:||cebbert, maciej.rutecki, makovick, rjw|
|Bug Depends on:|
Description Maciej Rutecki 2011-02-06 20:01:53 UTC
Subject : khugepaged: gets stuck when writing to USB flash, 2.6.38-rc2 Submitter : Jindřich Makovička <firstname.lastname@example.org> Date : 2011-01-31 19:28 Message-ID : AANLkTi=uOpN0PwWdGh6iri-vJwuMS+WMPxmaZjv0-TrV@mail.gmail.com References : http://marc.info/?l=linux-kernel&m=129650210516627&w=2 This entry is being used for tracking a regression from 2.6.37. Please don't close it until the problem is fixed in the mainline.
Comment 1 Chuck Ebbert 2011-03-27 01:12:20 UTC
The workaround found was: echo never >/sys/kernel/mm/transparent_hugepage/defrag echo no > /sys/kernel/mm/transparent_hugepage/khugepaged/defrag I believe this problem is fixed in 2.6.39, and possibly in 18.104.22.168 as well (22.214.171.124 has commit d527caf22e48480b102c7c6ee5b9ba12170148f7, "mm: compaction: prevent kswapd compacting memory to reduce CPU usage".)
Comment 2 Jindrich Makovicka 2011-03-27 08:33:11 UTC
I'll give it a try, but I am not sure is this is the same problem. During the lockups I encountered, the CPU utilization was (almost) zero.
Comment 3 Chuck Ebbert 2011-03-27 18:02:01 UTC
Hmm, this appears to be a duplicate of bug 31142, which is being worked on actively. This bug should be closed as a duplicate of that one...