[PATCH v4 10/21] sched: add per-task KStackWatch context
From: Jinchao Wang <hidden>
Date: 2025-09-12 10:12:46
Also in:
linux-doc, linux-mm, linux-perf-users, lkml, llvm, workflows
Subsystem:
scheduler, the rest · Maintainers:
Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
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 <redacted> --- 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 <linux/types.h> + +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 <linux/sem_types.h> #include <linux/shm.h> #include <linux/kmsan_types.h> +#include <linux/kstackwatch_types.h> #include <linux/mutex_types.h> #include <linux/plist_types.h> #include <linux/hrtimer_types.h>
@@ -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