Messages in this thread |  | | | Date | Wed, 7 Jan 2009 21:33:31 -0500 (EST) | | From | Steven Rostedt <> | | Subject | Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning |
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On Wed, 7 Jan 2009, Linus Torvalds wrote: > > Should that be: > > > > #if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_MEMORY_HOTPLUG) > > Well, probably CONFIG_MEMORY_HOTREMOVE, no? And I'd actually suggest that > unplugging should have a stop-machine if it doesn't already, just because > it's such a special case - like module removal.
I do not think stop-machine will help, unless that spinning is protected by preempt-disable. If the task gets preempted after grabbing the owner thread_info, and then stop-machine runs, the memory disappears, the task is scheduled back, accesses the owner thread_info and then page-fault.
-- Steve
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