[RFC] [PATCH 4/7] Uprobes Implementation

[Peter Zijlstra]

On Fri, 2010-01-15 at 18:38 +0530, Srikar Dronamraju wrote:
> * Peter Zijlstra <peterz at infradead.org> [2010-01-15 11:33:27]:
> 
> > 
> > > Uprobes layer would need to be notified of process life-time events
> > > like fork/clone/exec/exit. 
> > 
> > No so much the process lifetimes as the vma life times are interesting,
> > placing a hook in the vm code to track that isn't too hard, 
> > 
> > > It also needs to know
> > > 	-  when a breakpoint is hit
> > > 	-  stop and resume a thread.
> > 
> > A simple hook in the trap code is done quickly enough, and no reason to
> > stop the thread, its not going anywhere when it traps.
> > 
> > 
> 
> Some of the threads could be executing in the vicinity of the
> breakpoint when it is getting inserted or deleted. Wont we need to
> stop/quiesce those threads?

The easy answer it so use kstopmachine to patch the code, the slightly
more complex would be using something like:

  http://lkml.org/lkml/2010/1/12/300