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workqueue: Add debugobjects support 

Add debugobject support to track the life time of work_structs.

While at it, remove duplicate definition of
INIT_DELAYED_WORK_ON_STACK().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Thomas Gleixner 2009-11-16 01:09:48 +09:00 committed by Tejun Heo
parent a9366e61b0
commit dc186ad741
4 changed files with 166 additions and 15 deletions
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4
arch/x86/kernel/smpboot.c
View File

@ -687,7 +687,7 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu)
.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
};
INIT_WORK(&c_idle.work, do_fork_idle);
INIT_WORK_ON_STACK(&c_idle.work, do_fork_idle);
alternatives_smp_switch(1);
@ -713,6 +713,7 @@ static int __cpuinit do_boot_cpu(int apicid, int cpu)
if (IS_ERR(c_idle.idle)) {
printk("failed fork for CPU %d\n", cpu);
destroy_work_on_stack(&c_idle.work);
return PTR_ERR(c_idle.idle);
}
@ -831,6 +832,7 @@ do_rest:
smpboot_restore_warm_reset_vector();
}
destroy_work_on_stack(&c_idle.work);
return boot_error;
}

38
include/linux/workqueue.h
View File

@ -25,6 +25,7 @@ typedef void (*work_func_t)(struct work_struct *work);
struct work_struct {
atomic_long_t data;
#define WORK_STRUCT_PENDING 0 /* T if work item pending execution */
#define WORK_STRUCT_STATIC 1 /* static initializer (debugobjects) */
#define WORK_STRUCT_FLAG_MASK (3UL)
#define WORK_STRUCT_WQ_DATA_MASK (~WORK_STRUCT_FLAG_MASK)
struct list_head entry;
@ -35,6 +36,7 @@ struct work_struct {
};
#define WORK_DATA_INIT() ATOMIC_LONG_INIT(0)
#define WORK_DATA_STATIC_INIT() ATOMIC_LONG_INIT(2)
struct delayed_work {
struct work_struct work;
@ -63,7 +65,7 @@ struct execute_work {
#endif
#define __WORK_INITIALIZER(n, f) { \
.data = WORK_DATA_INIT(), \
.data = WORK_DATA_STATIC_INIT(), \
.entry = { &(n).entry, &(n).entry }, \
.func = (f), \
__WORK_INIT_LOCKDEP_MAP(#n, &(n)) \
@ -91,6 +93,14 @@ struct execute_work {
#define PREPARE_DELAYED_WORK(_work, _func) \
PREPARE_WORK(&(_work)->work, (_func))
#ifdef CONFIG_DEBUG_OBJECTS_WORK
extern void __init_work(struct work_struct *work, int onstack);
extern void destroy_work_on_stack(struct work_struct *work);
#else
static inline void __init_work(struct work_struct *work, int onstack) { }
static inline void destroy_work_on_stack(struct work_struct *work) { }
#endif
/*
* initialize all of a work item in one go
*
@ -99,24 +109,36 @@ struct execute_work {
* to generate better code.
*/
#ifdef CONFIG_LOCKDEP
#define INIT_WORK(_work, _func) \
#define __INIT_WORK(_work, _func, _onstack) \
do { \
static struct lock_class_key __key; \
\
__init_work((_work), _onstack); \
(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
lockdep_init_map(&(_work)->lockdep_map, #_work, &__key, 0);\
INIT_LIST_HEAD(&(_work)->entry); \
PREPARE_WORK((_work), (_func)); \
} while (0)
#else
#define INIT_WORK(_work, _func) \
#define __INIT_WORK(_work, _func, _onstack) \
do { \
__init_work((_work), _onstack); \
(_work)->data = (atomic_long_t) WORK_DATA_INIT(); \
INIT_LIST_HEAD(&(_work)->entry); \
PREPARE_WORK((_work), (_func)); \
} while (0)
#endif
#define INIT_WORK(_work, _func) \
do { \
__INIT_WORK((_work), (_func), 0); \
} while (0)
#define INIT_WORK_ON_STACK(_work, _func) \
do { \
__INIT_WORK((_work), (_func), 1); \
} while (0)
#define INIT_DELAYED_WORK(_work, _func) \
do { \
INIT_WORK(&(_work)->work, (_func)); \
@ -125,22 +147,16 @@ struct execute_work {
#define INIT_DELAYED_WORK_ON_STACK(_work, _func) \
do { \
INIT_WORK(&(_work)->work, (_func)); \
INIT_WORK_ON_STACK(&(_work)->work, (_func)); \
init_timer_on_stack(&(_work)->timer); \
} while (0)
#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func) \
#define INIT_DELAYED_WORK_DEFERRABLE(_work, _func) \
do { \
INIT_WORK(&(_work)->work, (_func)); \
init_timer_deferrable(&(_work)->timer); \
} while (0)
#define INIT_DELAYED_WORK_ON_STACK(_work, _func) \
do { \
INIT_WORK(&(_work)->work, (_func)); \
init_timer_on_stack(&(_work)->timer); \
} while (0)
/**
* work_pending - Find out whether a work item is currently pending
* @work: The work item in question

131
kernel/workqueue.c
View File

@ -68,6 +68,116 @@ struct workqueue_struct {
#endif
};
#ifdef CONFIG_DEBUG_OBJECTS_WORK
static struct debug_obj_descr work_debug_descr;
/*
* fixup_init is called when:
* - an active object is initialized
*/
static int work_fixup_init(void *addr, enum debug_obj_state state)
{
struct work_struct *work = addr;
switch (state) {
case ODEBUG_STATE_ACTIVE:
cancel_work_sync(work);
debug_object_init(work, &work_debug_descr);
return 1;
default:
return 0;
}
}
/*
* fixup_activate is called when:
* - an active object is activated
* - an unknown object is activated (might be a statically initialized object)
*/
static int work_fixup_activate(void *addr, enum debug_obj_state state)
{
struct work_struct *work = addr;
switch (state) {
case ODEBUG_STATE_NOTAVAILABLE:
/*
* This is not really a fixup. The work struct was
* statically initialized. We just make sure that it
* is tracked in the object tracker.
*/
if (test_bit(WORK_STRUCT_STATIC, work_data_bits(work))) {
debug_object_init(work, &work_debug_descr);
debug_object_activate(work, &work_debug_descr);
return 0;
}
WARN_ON_ONCE(1);
return 0;
case ODEBUG_STATE_ACTIVE:
WARN_ON(1);
default:
return 0;
}
}
/*
* fixup_free is called when:
* - an active object is freed
*/
static int work_fixup_free(void *addr, enum debug_obj_state state)
{
struct work_struct *work = addr;
switch (state) {
case ODEBUG_STATE_ACTIVE:
cancel_work_sync(work);
debug_object_free(work, &work_debug_descr);
return 1;
default:
return 0;
}
}
static struct debug_obj_descr work_debug_descr = {
.name = "work_struct",
.fixup_init = work_fixup_init,
.fixup_activate = work_fixup_activate,
.fixup_free = work_fixup_free,
};
static inline void debug_work_activate(struct work_struct *work)
{
debug_object_activate(work, &work_debug_descr);
}
static inline void debug_work_deactivate(struct work_struct *work)
{
debug_object_deactivate(work, &work_debug_descr);
}
void __init_work(struct work_struct *work, int onstack)
{
if (onstack)
debug_object_init_on_stack(work, &work_debug_descr);
else
debug_object_init(work, &work_debug_descr);
}
EXPORT_SYMBOL_GPL(__init_work);
void destroy_work_on_stack(struct work_struct *work)
{
debug_object_free(work, &work_debug_descr);
}
EXPORT_SYMBOL_GPL(destroy_work_on_stack);
#else
static inline void debug_work_activate(struct work_struct *work) { }
static inline void debug_work_deactivate(struct work_struct *work) { }
#endif
/* Serializes the accesses to the list of workqueues. */
static DEFINE_SPINLOCK(workqueue_lock);
static LIST_HEAD(workqueues);
@ -145,6 +255,7 @@ static void __queue_work(struct cpu_workqueue_struct *cwq,
{
unsigned long flags;
debug_work_activate(work);
spin_lock_irqsave(&cwq->lock, flags);
insert_work(cwq, work, &cwq->worklist);
spin_unlock_irqrestore(&cwq->lock, flags);
@ -280,6 +391,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
struct lockdep_map lockdep_map = work->lockdep_map;
#endif
trace_workqueue_execution(cwq->thread, work);
debug_work_deactivate(work);
cwq->current_work = work;
list_del_init(cwq->worklist.next);
spin_unlock_irq(&cwq->lock);
@ -350,11 +462,18 @@ static void wq_barrier_func(struct work_struct *work)
static void insert_wq_barrier(struct cpu_workqueue_struct *cwq,
struct wq_barrier *barr, struct list_head *head)
{
INIT_WORK(&barr->work, wq_barrier_func);
/*
* debugobject calls are safe here even with cwq->lock locked
* as we know for sure that this will not trigger any of the
* checks and call back into the fixup functions where we
* might deadlock.
*/
INIT_WORK_ON_STACK(&barr->work, wq_barrier_func);
__set_bit(WORK_STRUCT_PENDING, work_data_bits(&barr->work));
init_completion(&barr->done);
debug_work_activate(&barr->work);
insert_work(cwq, &barr->work, head);
}
@ -372,8 +491,10 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
}
spin_unlock_irq(&cwq->lock);
if (active)
if (active) {
wait_for_completion(&barr.done);
destroy_work_on_stack(&barr.work);
}
return active;
}
@ -451,6 +572,7 @@ out:
return 0;
wait_for_completion(&barr.done);
destroy_work_on_stack(&barr.work);
return 1;
}
EXPORT_SYMBOL_GPL(flush_work);
@ -485,6 +607,7 @@ static int try_to_grab_pending(struct work_struct *work)
*/
smp_rmb();
if (cwq == get_wq_data(work)) {
debug_work_deactivate(work);
list_del_init(&work->entry);
ret = 1;
}
@ -507,8 +630,10 @@ static void wait_on_cpu_work(struct cpu_workqueue_struct *cwq,
}
spin_unlock_irq(&cwq->lock);
if (unlikely(running))
if (unlikely(running)) {
wait_for_completion(&barr.done);
destroy_work_on_stack(&barr.work);
}
}
static void wait_on_work(struct work_struct *work)

8
lib/Kconfig.debug
View File

@ -298,6 +298,14 @@ config DEBUG_OBJECTS_TIMERS
timer routines to track the life time of timer objects and
validate the timer operations.
config DEBUG_OBJECTS_WORK
bool "Debug work objects"
depends on DEBUG_OBJECTS
help
If you say Y here, additional code will be inserted into the
work queue routines to track the life time of work objects and
validate the work operations.
config DEBUG_OBJECTS_ENABLE_DEFAULT
int "debug_objects bootup default value (0-1)"
range 0 1