[RFC][PATCH 1/2] uprobes: utrace-based user-space probes

[Jim Keniston]

Here's the latest rev of our i386 implementation of user-space
probes (uprobes), based on Roland's utrace infrastructure.  Uprobes
supplements utrace and kprobes, enabling a kernel module to probe
user-space applications in much the same way that a kprobes-based
module probes the kernel.  See Documentation/uprobes.txt in the patch
for details.

This patch should apply to any recent -mm kernel (i.e., any kernel
that includes utrace).  Comments welcome.

The single-stepping-out-of-line implementation has gotten pretty
big, and there are several alternatives to the way we implemented
it (the vma is fixed at 1 page and allocated only for processes
actually probed), so I've split that off as a separate patch.
(Watch this space.)

I'm reimplementing uretprobes to use a slot in the vma
for its trampoline.  I hope to post updated uretprobes and
deferred-registration patches in a few days.

Jim Keniston
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