Re: [RFC] [PATCH 4/7] Uprobes Implementation

From: Peter Zijlstra
Date: Fri Jan 15 2010 - 05:33:56 EST

On Fri, 2010-01-15 at 15:56 +0530, Srikar Dronamraju wrote:
> Hi Peter,
> Or there could be two threads that could be racing to
> insert/delete a breakpoint. These synchronization issues are all handled
> by the Uprobes layer.

Shouldn't be hard to put that in the ubp layer, right?

> 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.

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