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Peter Anvin" , x86@kernel.org, Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Mathieu Desnoyers , David Hildenbrand , Jonathan Corbet , Matthew Wilcox , Alan Stern , Randy Dunlap , Alexander Potapenko , Marco Elver , Mike Rapoport , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [RFC PATCH v2 00/13] mm/kwatch: dynamic hardware watchpoints for hunting memory corruption Message-Id: <20260720232442.3e6b0e70c6939541b8362e05@kernel.org> In-Reply-To: <20260717181004.GBalpv_MOaAflgFxgh@fat_crate.local> References: <20260717125023.1895892-1-wangjinchao600@gmail.com> <91f3486b-3b85-4b43-b099-0a5325643352@intel.com> <20260717181004.GBalpv_MOaAflgFxgh@fat_crate.local> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6FEA340002 X-Stat-Signature: s77ww9xtwmegdn1e9sn7phh1ei7xyogg X-HE-Tag: 1784557492-401327 X-HE-Meta: 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 tTR1hgNM ReH0M8wkF4SE/sgci5qLMtfe0ko378/mlzpFt5h0X5CQbWkJQvPLo4W8K63SPAJYR+bwB7f6poJzadaEHILG/cKod4Fp/Lgv2SXtnE0yIl4wM2zjZPyJjqPTRkhvT6EO1SHmA/sIZhrIq7eDjW7+BAcWspWQoJSav1C+BPAH042ozRp1yG60TQCciLw/NwxuruEMN1MnJXh8iYpQ2DlU9vrEInRwfxnq8BYGj2pIvM+33Q5ju83aw+3vuysw5/2QkW9+PSpbHBUIwnlw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 17 Jul 2026 11:10:04 -0700 Borislav Petkov wrote: > On Fri, Jul 17, 2026 at 06:41:49AM -0700, Dave Hansen wrote: > > On 7/17/26 05:50, Jinchao Wang wrote: > > > 24 files changed, 2115 insertions(+), 63 deletions(-) > > Reading this, I wonder how many kernel debugging features we need. I > > don't even think we have a centralized list of them. They all just live > > in their own silos. > > > > This one really seems like a super specialized tool. It has to be > > enabled at compile time and specifically aimed at a specific function. > > > > Maybe this should live off on the side for a while. If folks end up > > actually needing it, they can point their friendly LLM over to its tree. > > Right, and in my mbox right under this mail thread there's a > > https://lore.kernel.org/all/178429796992.157981.3393977217853767915.stgit@devnote2/ > > which Masami has been blasting almost every day this week which contains two > of the patches from this set here... Sorry about that. I tried to fix the reviewed comment from Sashiko, but I should wait for someone's comment. > > 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, -- Masami Hiramatsu (Google)