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

On Wed, Aug 05, 2026 at 03:34:04PM -0400, Steven Rostedt wrote:

On Mon, 3 Aug 2026 09:03:56 +0200
Peter Zijlstra [off-list ref] wrote:

quoted

quoted

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?

Schedule the watchpoint along with the task of course. Given there is
breakpoint/perf integration this should be trivial.