Re: [RFC PATCH v2 00/13] mm/kwatch: dynamic hardware watchpoints for hunting memory corruption

[Jinchao Wang]

On 7/20/2026 10:24 AM, Masami Hiramatsu (Google) wrote:
> On Fri, 17 Jul 2026 11:10:04 -0700
> Borislav Petkov <bp@xxxxxxxxx> wrote:

>> Looks to me like folks need to sit down and agree on strategy first.
> 
> Yeah, I need to talk with Jinchao.
> 
> Like kprobe, wprobe itself integrates watchpoint functionality into
> the tracing subsystem. Jinchao, I would like to ask you to redesign
> the kwatch tool based on fprobe and wprobe events in user space?
> I think that could reduce redundant efforts on the similar feature.
> 
> Using fprobe entry and exit event trigger, we can make a Function-
> scoped watch window. Also, since fprobe and wprobe are having BTF
> typecast support, you can access to the members of data structures
> more naturally.
> 
> If you are interested, I would be open to having you handle the
> development of the necessary features for wprobe.
> 
> Thank you,
> 
Thank you, Boris and Masami.

Boris is right that we should agree on the overall strategy before
moving either series forward, especially since they share the low-level
HWBP work. Masami is also right that fprobe and wprobe provide a more
appropriate foundation than introducing KWatch as another standalone
debugging tool.

After reconsidering the design, I will stop the standalone KWatch
series. Instead, I would like to work with Masami on extending wprobe
to support the function-scoped dynamic-watchpoint use cases that
motivated KWatch.

Masami, thank you for being open to having me develop the necessary
wprobe features. I am interested in taking that direction.
---
Thanks,
Jinchao