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Commit c3a46891 authored by Qu Wenruo's avatar Qu Wenruo Committed by Chris Mason
Browse files

btrfs: Add trace for btrfs_workqueue alloc/destroy 



Since most of the btrfs_workqueue is printed as pointer address,
for easier analysis, add trace for btrfs_workqueue alloc/destroy.
So it is possible to determine the workqueue that a given work belongs
to(by comparing the wq pointer address with alloc trace event).

Signed-off-by: default avatarQu Wenruo <quenruo@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent f094c9bd

fs/btrfs/async-thread.c

+5 −2
Original line number Diff line number Diff line
@@ -56,7 +56,8 @@ struct btrfs_workqueue { 
};



static inline struct __btrfs_workqueue

*__btrfs_alloc_workqueue(char *name, int flags, int max_active, int thresh)

*__btrfs_alloc_workqueue(const char *name, int flags, int max_active,

			 int thresh)

{

	struct __btrfs_workqueue *ret = kzalloc(sizeof(*ret), GFP_NOFS);
@@ -92,13 +93,14 @@ static inline struct __btrfs_workqueue 
	INIT_LIST_HEAD(&ret->ordered_list);

	spin_lock_init(&ret->list_lock);

	spin_lock_init(&ret->thres_lock);

	trace_btrfs_workqueue_alloc(ret, name, flags & WQ_HIGHPRI);

	return ret;

}



static inline void

__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq);



struct btrfs_workqueue *btrfs_alloc_workqueue(char *name,

struct btrfs_workqueue *btrfs_alloc_workqueue(const char *name,

					      int flags,

					      int max_active,

					      int thresh)
@@ -305,6 +307,7 @@ static inline void 
__btrfs_destroy_workqueue(struct __btrfs_workqueue *wq)

{

	destroy_workqueue(wq->normal_wq);

	trace_btrfs_workqueue_destroy(wq);

	kfree(wq);

}

fs/btrfs/async-thread.h

+1 −1
Original line number Diff line number Diff line
@@ -38,7 +38,7 @@ struct btrfs_work { 
	unsigned long flags;

};



struct btrfs_workqueue *btrfs_alloc_workqueue(char *name,

struct btrfs_workqueue *btrfs_alloc_workqueue(const char *name,

					      int flags,

					      int max_active,

					      int thresh);

include/trace/events/btrfs.h

+55 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ struct btrfs_free_cluster; 
struct map_lookup;

struct extent_buffer;

struct btrfs_work;

struct __btrfs_workqueue;



#define show_ref_type(type)						\

	__print_symbolic(type,						\
@@ -1063,6 +1064,60 @@ DEFINE_EVENT(btrfs__work, btrfs_ordered_sched, 
	TP_ARGS(work)

);



DECLARE_EVENT_CLASS(btrfs__workqueue,



	TP_PROTO(struct __btrfs_workqueue *wq, const char *name, int high),



	TP_ARGS(wq, name, high),



	TP_STRUCT__entry(

		__field(	void *,	wq			)

		__string(	name,	name			)

		__field(	int ,	high			)

	),



	TP_fast_assign(

		__entry->wq		= wq;

		__assign_str(name, name);

		__entry->high		= high;

	),



	TP_printk("name=%s%s, wq=%p", __get_str(name),

		  __print_flags(__entry->high, "",

				{(WQ_HIGHPRI),	"-high"}),

		  __entry->wq)

);



DEFINE_EVENT(btrfs__workqueue, btrfs_workqueue_alloc,



	TP_PROTO(struct __btrfs_workqueue *wq, const char *name, int high),



	TP_ARGS(wq, name, high)

);



DECLARE_EVENT_CLASS(btrfs__workqueue_done,



	TP_PROTO(struct __btrfs_workqueue *wq),



	TP_ARGS(wq),



	TP_STRUCT__entry(

		__field(	void *,	wq			)

	),



	TP_fast_assign(

		__entry->wq		= wq;

	),



	TP_printk("wq=%p", __entry->wq)

);



DEFINE_EVENT(btrfs__workqueue_done, btrfs_workqueue_destroy,



	TP_PROTO(struct __btrfs_workqueue *wq),



	TP_ARGS(wq)

);



#endif /* _TRACE_BTRFS_H */