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Wed, 24 Sep 2025 04:52:14 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Randy Dunlap , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. 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Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v5 11/23] sched: add per-task context Date: Wed, 24 Sep 2025 19:50:54 +0800 Message-ID: <20250924115124.194940-12-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250924115124.194940-1-wangjinchao600@gmail.com> References: <20250924115124.194940-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 14112C0003 X-Stat-Signature: ym1j1jfpzohksx4j38t8sunjbxob5eqc X-Rspam-User: X-HE-Tag: 1758714735-663005 X-HE-Meta: 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 l6DR0E2k 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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 ksw_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 | 14 ++++++++++++++ include/linux/sched.h | 5 +++++ 2 files changed, 19 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..2b515c06a918 --- /dev/null +++ b/include/linux/kstackwatch_types.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_KSTACK_WATCH_TYPES_H +#define _LINUX_KSTACK_WATCH_TYPES_H +#include + +struct ksw_watchpoint; +struct ksw_ctx { + struct ksw_watchpoint *wp; + ulong sp; + u16 depth; + u16 generation; +}; + +#endif /* _LINUX_KSTACK_WATCH_TYPES_H */ diff --git a/include/linux/sched.h b/include/linux/sched.h index f8188b833350..6935ee51f855 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 ksw_ctx ksw_ctx; +#endif + #if IS_ENABLED(CONFIG_KUNIT) struct kunit *kunit_test; #endif -- 2.43.0