Messages in this thread | | | Subject | Re: task_struct.mm == NULL | From | Shaya Potter <> | Date | 28 Nov 2001 09:10:30 -0500 |
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On Wed, 2001-11-28 at 07:23, Andi Kleen wrote: > Frank Cornelis <Frank.Cornelis@rug.ac.be> writes: > > > Hey, > > > > I found in some code checks for task_struct.mm being NULL. > > When can task_struct.mm of a process be NULL except right before the > > process-kill? > > For kernel threads that run in lazy-mm mode. It allows a much cheaper context > switch into kernel threads.
oh. so not all kernel threades have mm == null. I used to think that kernel threads ran in the kernel's address space, therefore there was no point in having an mm struct as that just defines a virtual process address space. What's this lazy_mm mode?
thanks,
shaya
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