Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault

[Avi Kivity]

On 07/16/2010 07:58 PM, Mathieu Desnoyers wrote:
> > Why is that kernel code calling vmalloc_sync_all()?  If it is only NMI
> > which cannot take vmalloc faults, why bother?  If not, why not?
> >      
> Modules come as yet another example of stuff that is loaded in vmalloc'd space
> and can be accesses from NMI context. That would include oprofile, tracers, and
> probably others I'm forgetting about.
>    

Module loading can certainly take a vmalloc_sync_all() (though I agree 
it's unpleasant).  Anything else?

Note perf is not modular at this time, but could be made so with 
preempt/sched notifiers to hook the context switch.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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