Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups

[Nick Piggin]

Ananth N Mavinakayanahalli wrote:
> On Fri, Apr 13, 2007 at 12:50:20PM +1000, Nick Piggin wrote:

> > It definitely seems like you can use some kernel functions, but the
> > ones I saw may just be systemtap facilities. But what is so surprising
> > about being able to call a kernel function when running in kernel
> > context? Perhaps there is some fundamental limitation of kprobes that
> > I don't understand.
>
>
> The main requirement for kprobes handlers is that they can't sleep. You
> could definitely call a kernel function from kprobe handlers as long as
> the function doesn't sleep.

That would be enough to access basically all the VM data structures.

--
SUSE Labs, Novell Inc.
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