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Fri, 12 Sep 2025 03:12:45 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Kees Cook , Alice Ryhl , Sami Tolvanen , Miguel Ojeda , Masahiro Yamada , Rong Xu , Naveen N Rao , David Kaplan , Andrii Nakryiko , Jinjie Ruan , Nam Cao , workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Andrey Ryabinin , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v4 10/21] sched: add per-task KStackWatch context Date: Fri, 12 Sep 2025 18:11:20 +0800 Message-ID: <20250912101145.465708-11-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250912101145.465708-1-wangjinchao600@gmail.com> References: <20250912101145.465708-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 3CF994000E X-Stat-Signature: uokwzuqyhx85nyj17qqpp3ohmszncxx9 X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1757671967-893155 X-HE-Meta: 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 NnCAVrNa 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce struct kstackwatch_ctx to enable lockless per-task state tracking. This is required because KStackWatch operates in NMI context (via kprobe handler) where traditional locking is unsafe. Signed-off-by: Jinchao Wang --- include/linux/kstackwatch_types.h | 13 +++++++++++++ include/linux/sched.h | 5 +++++ 2 files changed, 18 insertions(+) create mode 100644 include/linux/kstackwatch_types.h diff --git a/include/linux/kstackwatch_types.h b/include/linux/kstackwatch_types.h new file mode 100644 index 000000000000..93855fcc7981 --- /dev/null +++ b/include/linux/kstackwatch_types.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_KSTACK_WATCH_TYPES_H +#define _LINUX_KSTACK_WATCH_TYPES_H +#include + +struct kstackwatch_ctx { + ulong watch_addr; + u16 watch_len; + u16 depth; + bool watch_on; +}; + +#endif /* _LINUX_KSTACK_WATCH_TYPES_H */ diff --git a/include/linux/sched.h b/include/linux/sched.h index f8188b833350..1b324b458309 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -1481,6 +1482,10 @@ struct task_struct { struct kmsan_ctx kmsan_ctx; #endif +#if IS_ENABLED(CONFIG_KSTACK_WATCH) + struct kstackwatch_ctx kstackwatch_ctx; +#endif + #if IS_ENABLED(CONFIG_KUNIT) struct kunit *kunit_test; #endif -- 2.43.0