Messages in this thread | | | Date | Wed, 27 Jun 2012 12:46:08 -0700 (PDT) | From | David Rientjes <> | Subject | Re: [PATCH 06/11] memcg: kmem controller infrastructure |
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On Wed, 27 Jun 2012, Glauber Costa wrote:
> > > Nothing, but I also don't see how to prevent that. > > > > You can test for current->flags & PF_KTHREAD following the check for > > in_interrupt() and return true, it's what you were trying to do with the > > check for !current->mm. > > > > am I right to believe that if not in interrupt context - already ruled out - > and !(current->flags & PF_KTHREAD), I am guaranteed to have a mm context, and > thus, don't need to test against it ? >
No, because an mm may have been detached in the exit path by running exit_mm(). We'd certainly hope that there are no slab allocations following that point, though, but you'd still need to test current->mm.
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