Add kobject trace points to track kobject operations: init, add, set_name, init_and_add, create_and_add, move, rename, get, put, cleanup, and del.
Kobject trace points can aid in debugging, generating status and graphs on kobjects in the kernel and their hierarchy. Signed-off-by: Shuah Khan <[email protected]> --- include/trace/events/kobject.h | 259 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 259 insertions(+) create mode 100644 include/trace/events/kobject.h diff --git a/include/trace/events/kobject.h b/include/trace/events/kobject.h new file mode 100644 index 0000000..6a29665 --- /dev/null +++ b/include/trace/events/kobject.h @@ -0,0 +1,259 @@ +/* + * kobject trace points + * + * Copyright (C) 2016 Shuah Khan <[email protected]> + * + */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM kobject + +#if !defined(_TRACE_KOBJECT_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_KOBJECT_H + +#include <linux/tracepoint.h> +#include <linux/kobject.h> + +/* kobject_init_class */ +DECLARE_EVENT_CLASS(kobject_init_class, + + TP_PROTO(struct kobject *kobj), + + TP_ARGS(kobj), + + TP_STRUCT__entry( + __field(void *, kobj) + __field(int, state_initialized) + ), + + TP_fast_assign( + __entry->kobj = kobj; + __entry->state_initialized = kobj->state_initialized; + ), + + TP_printk("KOBJECT: %p state=%d", + __entry->kobj, + __entry->state_initialized + )); + +/** + * kobject_init - called from kobject_init() when kobject is initialized + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_init_class, kobject_init, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/* kobject_class */ +DECLARE_EVENT_CLASS(kobject_class, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj), + + TP_STRUCT__entry( + __field(void *, kobj) + __string(name, kobject_name(kobj)) + __field(int, state_initialized) + __field(void *, parent) + __string(pname, kobj->parent ? kobject_name(kobj->parent) : "") + __field(int, count) + ), + + TP_fast_assign( + __entry->kobj = kobj; + __assign_str(name, kobject_name(kobj)); + __entry->state_initialized = kobj->state_initialized; + __entry->parent = kobj->parent; + __assign_str(pname, + kobj->parent ? kobject_name(kobj->parent) : ""); + __entry->count = atomic_read(&kobj->kref.refcount); + ), + + TP_printk("KOBJECT: %s (%p) state=%d parent= %s (%p) counter= %d", + __get_str(name), + __entry->kobj, + __entry->state_initialized, + __get_str(pname), + __entry->parent, + __entry->count + )); + +/** + * kobject_add - called from kobject_add() when kobject is added + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_add, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/** + * kobject_init_and_add - called from kobject_init_and_add() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_init_and_add, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/** + * kobject_create_and_add - called from kobject_create_and_add() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_create_and_add, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/** + * kobject_set_name - called from kobject_set_name() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_set_name, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/** + * kobject_del - called from kobject_del() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_del, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/** + * kobject_cleanup - called from kobject_cleanup() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_cleanup, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); +/** + * kobject_get - called from kobject_get() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_class, kobject_get, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj)); + +/** + * kobject_put - called from kobject_put() + * @kobj: - pointer to struct kobject + * + * Trace is called before kref_put() to avoid use-after-free on kobj, in case + * kobject is released. Decrement the counter before printing the value. + */ +TRACE_EVENT(kobject_put, + + TP_PROTO(struct kobject *kobj), + TP_ARGS(kobj), + + TP_STRUCT__entry( + __field(void *, kobj) + __string(name, kobject_name(kobj)) + __field(int, state_initialized) + __field(void *, parent) + __string(pname, kobj->parent ? kobject_name(kobj->parent) : "") + __field(int, count) + ), + + TP_fast_assign( + __entry->kobj = kobj; + __assign_str(name, kobject_name(kobj)); + __entry->state_initialized = kobj->state_initialized; + __entry->parent = kobj->parent; + __assign_str(pname, + kobj->parent ? kobject_name(kobj->parent) : ""); + __entry->count = atomic_read(&kobj->kref.refcount) - 1; + ), + + TP_printk("KOBJECT: %s (%p) state=%d parent= %s (%p) counter= %d", + __get_str(name), + __entry->kobj, + __entry->state_initialized, + __get_str(pname), + __entry->parent, + __entry->count + )); + +/* kobject_move_class */ +DECLARE_EVENT_CLASS(kobject_move_class, + + TP_PROTO(struct kobject *kobj, struct kobject *old_parent), + TP_ARGS(kobj, old_parent), + + TP_STRUCT__entry( + __field(void *, kobj) + __string(name, kobject_name(kobj)) + __field(int, state_initialized) + __field(void *, parent) + __string(pname, kobj->parent ? kobject_name(kobj->parent) : "") + ), + + TP_fast_assign( + __entry->kobj = kobj; + __assign_str(name, kobject_name(kobj)); + __entry->state_initialized = kobj->state_initialized; + __entry->parent = kobj->parent; + __assign_str(pname, + kobj->parent ? kobject_name(kobj->parent) : ""); + ), + + TP_printk("KOBJECT: %s (%p) state=%d parent= %s (%p)", + __get_str(name), + __entry->kobj, + __entry->state_initialized, + __get_str(pname), + __entry->parent + )); + +/** + * kobject_move - called from kobject_move() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_move_class, kobject_move, + + TP_PROTO(struct kobject *kobj, struct kobject *old_parent), + TP_ARGS(kobj, old_parent)); + +/* kobject_rename_class */ +DECLARE_EVENT_CLASS(kobject_rename_class, + + TP_PROTO(struct kobject *kobj, const char *old), + TP_ARGS(kobj, old), + + TP_STRUCT__entry( + __field(void *, kobj) + __string(name, kobject_name(kobj)) + __string(oldname, old) + ), + + TP_fast_assign( + __entry->kobj = kobj; + __assign_str(name, kobject_name(kobj)); + __assign_str(oldname, old); + ), + + TP_printk("KOBJECT: %s (%p) oldname= %s", + __get_str(name), + __entry->kobj, + __get_str(oldname) + )); + +/** + * kobject_rename - called from kobject_rename() + * @kobj: - pointer to struct kobject + */ +DEFINE_EVENT(kobject_rename_class, kobject_rename, + + TP_PROTO(struct kobject *kobj, const char *old), + TP_ARGS(kobj, old)); + +#endif /* #if !defined(_TRACE_KOBJECT_H) ... */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> -- 2.7.4
