Re: [PATCH v11 04/11] tracing: wprobe: Add watchpoint probe event based on hardware breakpoint

Steven Rostedt <[email protected]> Wed, 5 Aug 2026 15:34:04 -0400

Newsgroups	org.kernel.vger.linux-trace-kernel,org.kernel.vger.linux-doc,org.kernel.vger.linux-kernel,org.kernel.vger.linux-perf-users
Message-ID	<[email protected]>

On Mon, 3 Aug 2026 09:03:56 +0200
Peter Zijlstra <[email protected]> wrote:

> > The new syntax is;
> > 
> >  w[:[GROUP/]EVENT] [r|w|rw]@[ADDR|SYM][:SIZE] [FETCH_ARGs]
> > 
> > User also can use $addr to fetch the accessed address and $value to fetch
> > the accessed memory value (shorthand for '+0($addr)'). No other variables
> > are supported.  
> 
> This seems limited to kernel addresses only? Should not also userspace
> addresses be supported?

Hmm, how would that work? The address is global for all tasks, so if you
add a user space address, what task would that be for? The one writing the
probe?

-- Steve