4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
8 * Data type definitions, declarations, prototypes.
10 * Started by: Thomas Gleixner and Ingo Molnar
12 * For licencing details see kernel-base/COPYING
14 #ifndef _LINUX_PERF_EVENT_H
15 #define _LINUX_PERF_EVENT_H
17 #include <uapi/linux/perf_event.h>
20 * Kernel-internal data types and definitions:
23 #ifdef CONFIG_PERF_EVENTS
24 # include <linux/cgroup.h>
25 # include <asm/perf_event.h>
26 # include <asm/local64.h>
29 struct perf_guest_info_callbacks
{
30 int (*is_in_guest
)(void);
31 int (*is_user_mode
)(void);
32 unsigned long (*get_guest_ip
)(void);
35 #ifdef CONFIG_HAVE_HW_BREAKPOINT
36 #include <asm/hw_breakpoint.h>
39 #include <linux/list.h>
40 #include <linux/mutex.h>
41 #include <linux/rculist.h>
42 #include <linux/rcupdate.h>
43 #include <linux/spinlock.h>
44 #include <linux/hrtimer.h>
46 #include <linux/pid_namespace.h>
47 #include <linux/workqueue.h>
48 #include <linux/ftrace.h>
49 #include <linux/cpu.h>
50 #include <linux/irq_work.h>
51 #include <linux/static_key.h>
52 #include <linux/atomic.h>
53 #include <linux/sysfs.h>
54 #include <linux/perf_regs.h>
55 #include <asm/local.h>
57 struct perf_callchain_entry
{
59 __u64 ip
[PERF_MAX_STACK_DEPTH
];
62 struct perf_raw_record
{
68 * single taken branch record layout:
70 * from: source instruction (may not always be a branch insn)
72 * mispred: branch target was mispredicted
73 * predicted: branch target was predicted
75 * support for mispred, predicted is optional. In case it
76 * is not supported mispred = predicted = 0.
78 struct perf_branch_entry
{
81 __u64 mispred
:1, /* target mispredicted */
82 predicted
:1,/* target predicted */
87 * branch stack layout:
88 * nr: number of taken branches stored in entries[]
90 * Note that nr can vary from sample to sample
91 * branches (to, from) are stored from most recent
92 * to least recent, i.e., entries[0] contains the most
95 struct perf_branch_stack
{
97 struct perf_branch_entry entries
[0];
100 struct perf_regs_user
{
102 struct pt_regs
*regs
;
108 * extra PMU register associated with an event
110 struct hw_perf_event_extra
{
111 u64 config
; /* register value */
112 unsigned int reg
; /* register address or index */
113 int alloc
; /* extra register already allocated */
114 int idx
; /* index in shared_regs->regs[] */
118 * struct hw_perf_event - performance event hardware details:
120 struct hw_perf_event
{
121 #ifdef CONFIG_PERF_EVENTS
123 struct { /* hardware */
126 unsigned long config_base
;
127 unsigned long event_base
;
128 int event_base_rdpmc
;
132 struct hw_perf_event_extra extra_reg
;
133 struct hw_perf_event_extra branch_reg
;
135 struct { /* software */
136 struct hrtimer hrtimer
;
138 struct { /* tracepoint */
139 struct task_struct
*tp_target
;
140 /* for tp_event->class */
141 struct list_head tp_list
;
143 #ifdef CONFIG_HAVE_HW_BREAKPOINT
144 struct { /* breakpoint */
146 * Crufty hack to avoid the chicken and egg
147 * problem hw_breakpoint has with context
148 * creation and event initalization.
150 struct task_struct
*bp_target
;
151 struct arch_hw_breakpoint info
;
152 struct list_head bp_list
;
157 local64_t prev_count
;
160 local64_t period_left
;
165 u64 freq_count_stamp
;
170 * hw_perf_event::state flags
172 #define PERF_HES_STOPPED 0x01 /* the counter is stopped */
173 #define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
174 #define PERF_HES_ARCH 0x04
179 * Common implementation detail of pmu::{start,commit,cancel}_txn
181 #define PERF_EVENT_TXN 0x1
184 * struct pmu - generic performance monitoring unit
187 struct list_head entry
;
190 const struct attribute_group
**attr_groups
;
194 int * __percpu pmu_disable_count
;
195 struct perf_cpu_context
* __percpu pmu_cpu_context
;
199 * Fully disable/enable this PMU, can be used to protect from the PMI
200 * as well as for lazy/batch writing of the MSRs.
202 void (*pmu_enable
) (struct pmu
*pmu
); /* optional */
203 void (*pmu_disable
) (struct pmu
*pmu
); /* optional */
206 * Try and initialize the event for this PMU.
207 * Should return -ENOENT when the @event doesn't match this PMU.
209 int (*event_init
) (struct perf_event
*event
);
211 #define PERF_EF_START 0x01 /* start the counter when adding */
212 #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
213 #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
216 * Adds/Removes a counter to/from the PMU, can be done inside
217 * a transaction, see the ->*_txn() methods.
219 int (*add
) (struct perf_event
*event
, int flags
);
220 void (*del
) (struct perf_event
*event
, int flags
);
223 * Starts/Stops a counter present on the PMU. The PMI handler
224 * should stop the counter when perf_event_overflow() returns
225 * !0. ->start() will be used to continue.
227 void (*start
) (struct perf_event
*event
, int flags
);
228 void (*stop
) (struct perf_event
*event
, int flags
);
231 * Updates the counter value of the event.
233 void (*read
) (struct perf_event
*event
);
236 * Group events scheduling is treated as a transaction, add
237 * group events as a whole and perform one schedulability test.
238 * If the test fails, roll back the whole group
240 * Start the transaction, after this ->add() doesn't need to
241 * do schedulability tests.
243 void (*start_txn
) (struct pmu
*pmu
); /* optional */
245 * If ->start_txn() disabled the ->add() schedulability test
246 * then ->commit_txn() is required to perform one. On success
247 * the transaction is closed. On error the transaction is kept
248 * open until ->cancel_txn() is called.
250 int (*commit_txn
) (struct pmu
*pmu
); /* optional */
252 * Will cancel the transaction, assumes ->del() is called
253 * for each successful ->add() during the transaction.
255 void (*cancel_txn
) (struct pmu
*pmu
); /* optional */
258 * Will return the value for perf_event_mmap_page::index for this event,
259 * if no implementation is provided it will default to: event->hw.idx + 1.
261 int (*event_idx
) (struct perf_event
*event
); /*optional */
264 * flush branch stack on context-switches (needed in cpu-wide mode)
266 void (*flush_branch_stack
) (void);
270 * enum perf_event_active_state - the states of a event
272 enum perf_event_active_state
{
273 PERF_EVENT_STATE_ERROR
= -2,
274 PERF_EVENT_STATE_OFF
= -1,
275 PERF_EVENT_STATE_INACTIVE
= 0,
276 PERF_EVENT_STATE_ACTIVE
= 1,
280 struct perf_sample_data
;
282 typedef void (*perf_overflow_handler_t
)(struct perf_event
*,
283 struct perf_sample_data
*,
284 struct pt_regs
*regs
);
286 enum perf_group_flag
{
287 PERF_GROUP_SOFTWARE
= 0x1,
290 #define SWEVENT_HLIST_BITS 8
291 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
293 struct swevent_hlist
{
294 struct hlist_head heads
[SWEVENT_HLIST_SIZE
];
295 struct rcu_head rcu_head
;
298 #define PERF_ATTACH_CONTEXT 0x01
299 #define PERF_ATTACH_GROUP 0x02
300 #define PERF_ATTACH_TASK 0x04
302 #ifdef CONFIG_CGROUP_PERF
304 * perf_cgroup_info keeps track of time_enabled for a cgroup.
305 * This is a per-cpu dynamically allocated data structure.
307 struct perf_cgroup_info
{
313 struct cgroup_subsys_state css
;
314 struct perf_cgroup_info
*info
; /* timing info, one per cpu */
321 * struct perf_event - performance event kernel representation:
324 #ifdef CONFIG_PERF_EVENTS
325 struct list_head group_entry
;
326 struct list_head event_entry
;
327 struct list_head sibling_list
;
328 struct hlist_node hlist_entry
;
331 struct perf_event
*group_leader
;
334 enum perf_event_active_state state
;
335 unsigned int attach_state
;
337 atomic64_t child_count
;
340 * These are the total time in nanoseconds that the event
341 * has been enabled (i.e. eligible to run, and the task has
342 * been scheduled in, if this is a per-task event)
343 * and running (scheduled onto the CPU), respectively.
345 * They are computed from tstamp_enabled, tstamp_running and
346 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
348 u64 total_time_enabled
;
349 u64 total_time_running
;
352 * These are timestamps used for computing total_time_enabled
353 * and total_time_running when the event is in INACTIVE or
354 * ACTIVE state, measured in nanoseconds from an arbitrary point
356 * tstamp_enabled: the notional time when the event was enabled
357 * tstamp_running: the notional time when the event was scheduled on
358 * tstamp_stopped: in INACTIVE state, the notional time when the
359 * event was scheduled off.
366 * timestamp shadows the actual context timing but it can
367 * be safely used in NMI interrupt context. It reflects the
368 * context time as it was when the event was last scheduled in.
370 * ctx_time already accounts for ctx->timestamp. Therefore to
371 * compute ctx_time for a sample, simply add perf_clock().
375 struct perf_event_attr attr
;
379 struct hw_perf_event hw
;
381 struct perf_event_context
*ctx
;
382 atomic_long_t refcount
;
385 * These accumulate total time (in nanoseconds) that children
386 * events have been enabled and running, respectively.
388 atomic64_t child_total_time_enabled
;
389 atomic64_t child_total_time_running
;
392 * Protect attach/detach and child_list:
394 struct mutex child_mutex
;
395 struct list_head child_list
;
396 struct perf_event
*parent
;
401 struct list_head owner_entry
;
402 struct task_struct
*owner
;
405 struct mutex mmap_mutex
;
408 struct user_struct
*mmap_user
;
409 struct ring_buffer
*rb
;
410 struct list_head rb_entry
;
413 wait_queue_head_t waitq
;
414 struct fasync_struct
*fasync
;
416 /* delayed work for NMIs and such */
420 struct irq_work pending
;
422 atomic_t event_limit
;
424 void (*destroy
)(struct perf_event
*);
425 struct rcu_head rcu_head
;
427 struct pid_namespace
*ns
;
430 perf_overflow_handler_t overflow_handler
;
431 void *overflow_handler_context
;
433 #ifdef CONFIG_EVENT_TRACING
434 struct ftrace_event_call
*tp_event
;
435 struct event_filter
*filter
;
436 #ifdef CONFIG_FUNCTION_TRACER
437 struct ftrace_ops ftrace_ops
;
441 #ifdef CONFIG_CGROUP_PERF
442 struct perf_cgroup
*cgrp
; /* cgroup event is attach to */
443 int cgrp_defer_enabled
;
446 #endif /* CONFIG_PERF_EVENTS */
449 enum perf_event_context_type
{
455 * struct perf_event_context - event context structure
457 * Used as a container for task events and CPU events as well:
459 struct perf_event_context
{
461 enum perf_event_context_type type
;
463 * Protect the states of the events in the list,
464 * nr_active, and the list:
468 * Protect the list of events. Locking either mutex or lock
469 * is sufficient to ensure the list doesn't change; to change
470 * the list you need to lock both the mutex and the spinlock.
474 struct list_head pinned_groups
;
475 struct list_head flexible_groups
;
476 struct list_head event_list
;
484 struct task_struct
*task
;
487 * Context clock, runs when context enabled.
493 * These fields let us detect when two contexts have both
494 * been cloned (inherited) from a common ancestor.
496 struct perf_event_context
*parent_ctx
;
500 int nr_cgroups
; /* cgroup evts */
501 int nr_branch_stack
; /* branch_stack evt */
502 struct rcu_head rcu_head
;
506 * Number of contexts where an event can trigger:
507 * task, softirq, hardirq, nmi.
509 #define PERF_NR_CONTEXTS 4
512 * struct perf_event_cpu_context - per cpu event context structure
514 struct perf_cpu_context
{
515 struct perf_event_context ctx
;
516 struct perf_event_context
*task_ctx
;
519 struct list_head rotation_list
;
520 int jiffies_interval
;
521 struct pmu
*unique_pmu
;
522 struct perf_cgroup
*cgrp
;
525 struct perf_output_handle
{
526 struct perf_event
*event
;
527 struct ring_buffer
*rb
;
528 unsigned long wakeup
;
534 #ifdef CONFIG_PERF_EVENTS
536 extern int perf_pmu_register(struct pmu
*pmu
, char *name
, int type
);
537 extern void perf_pmu_unregister(struct pmu
*pmu
);
539 extern int perf_num_counters(void);
540 extern const char *perf_pmu_name(void);
541 extern void __perf_event_task_sched_in(struct task_struct
*prev
,
542 struct task_struct
*task
);
543 extern void __perf_event_task_sched_out(struct task_struct
*prev
,
544 struct task_struct
*next
);
545 extern int perf_event_init_task(struct task_struct
*child
);
546 extern void perf_event_exit_task(struct task_struct
*child
);
547 extern void perf_event_free_task(struct task_struct
*task
);
548 extern void perf_event_delayed_put(struct task_struct
*task
);
549 extern void perf_event_print_debug(void);
550 extern void perf_pmu_disable(struct pmu
*pmu
);
551 extern void perf_pmu_enable(struct pmu
*pmu
);
552 extern int perf_event_task_disable(void);
553 extern int perf_event_task_enable(void);
554 extern int perf_event_refresh(struct perf_event
*event
, int refresh
);
555 extern void perf_event_update_userpage(struct perf_event
*event
);
556 extern int perf_event_release_kernel(struct perf_event
*event
);
557 extern struct perf_event
*
558 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
560 struct task_struct
*task
,
561 perf_overflow_handler_t callback
,
563 extern void perf_pmu_migrate_context(struct pmu
*pmu
,
564 int src_cpu
, int dst_cpu
);
565 extern u64
perf_event_read_value(struct perf_event
*event
,
566 u64
*enabled
, u64
*running
);
569 struct perf_sample_data
{
586 struct perf_callchain_entry
*callchain
;
587 struct perf_raw_record
*raw
;
588 struct perf_branch_stack
*br_stack
;
589 struct perf_regs_user regs_user
;
593 static inline void perf_sample_data_init(struct perf_sample_data
*data
,
594 u64 addr
, u64 period
)
596 /* remaining struct members initialized in perf_prepare_sample() */
599 data
->br_stack
= NULL
;
600 data
->period
= period
;
601 data
->regs_user
.abi
= PERF_SAMPLE_REGS_ABI_NONE
;
602 data
->regs_user
.regs
= NULL
;
603 data
->stack_user_size
= 0;
606 extern void perf_output_sample(struct perf_output_handle
*handle
,
607 struct perf_event_header
*header
,
608 struct perf_sample_data
*data
,
609 struct perf_event
*event
);
610 extern void perf_prepare_sample(struct perf_event_header
*header
,
611 struct perf_sample_data
*data
,
612 struct perf_event
*event
,
613 struct pt_regs
*regs
);
615 extern int perf_event_overflow(struct perf_event
*event
,
616 struct perf_sample_data
*data
,
617 struct pt_regs
*regs
);
619 static inline bool is_sampling_event(struct perf_event
*event
)
621 return event
->attr
.sample_period
!= 0;
625 * Return 1 for a software event, 0 for a hardware event
627 static inline int is_software_event(struct perf_event
*event
)
629 return event
->pmu
->task_ctx_nr
== perf_sw_context
;
632 extern struct static_key perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
634 extern void __perf_sw_event(u32
, u64
, struct pt_regs
*, u64
);
636 #ifndef perf_arch_fetch_caller_regs
637 static inline void perf_arch_fetch_caller_regs(struct pt_regs
*regs
, unsigned long ip
) { }
641 * Take a snapshot of the regs. Skip ip and frame pointer to
642 * the nth caller. We only need a few of the regs:
643 * - ip for PERF_SAMPLE_IP
644 * - cs for user_mode() tests
645 * - bp for callchains
646 * - eflags, for future purposes, just in case
648 static inline void perf_fetch_caller_regs(struct pt_regs
*regs
)
650 memset(regs
, 0, sizeof(*regs
));
652 perf_arch_fetch_caller_regs(regs
, CALLER_ADDR0
);
655 static __always_inline
void
656 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
)
658 struct pt_regs hot_regs
;
660 if (static_key_false(&perf_swevent_enabled
[event_id
])) {
662 perf_fetch_caller_regs(&hot_regs
);
665 __perf_sw_event(event_id
, nr
, regs
, addr
);
669 extern struct static_key_deferred perf_sched_events
;
671 static inline void perf_event_task_sched_in(struct task_struct
*prev
,
672 struct task_struct
*task
)
674 if (static_key_false(&perf_sched_events
.key
))
675 __perf_event_task_sched_in(prev
, task
);
678 static inline void perf_event_task_sched_out(struct task_struct
*prev
,
679 struct task_struct
*next
)
681 perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES
, 1, NULL
, 0);
683 if (static_key_false(&perf_sched_events
.key
))
684 __perf_event_task_sched_out(prev
, next
);
687 extern void perf_event_mmap(struct vm_area_struct
*vma
);
688 extern struct perf_guest_info_callbacks
*perf_guest_cbs
;
689 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
690 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
692 extern void perf_event_comm(struct task_struct
*tsk
);
693 extern void perf_event_fork(struct task_struct
*tsk
);
696 DECLARE_PER_CPU(struct perf_callchain_entry
, perf_callchain_entry
);
698 extern void perf_callchain_user(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
699 extern void perf_callchain_kernel(struct perf_callchain_entry
*entry
, struct pt_regs
*regs
);
701 static inline void perf_callchain_store(struct perf_callchain_entry
*entry
, u64 ip
)
703 if (entry
->nr
< PERF_MAX_STACK_DEPTH
)
704 entry
->ip
[entry
->nr
++] = ip
;
707 extern int sysctl_perf_event_paranoid
;
708 extern int sysctl_perf_event_mlock
;
709 extern int sysctl_perf_event_sample_rate
;
711 extern int perf_proc_update_handler(struct ctl_table
*table
, int write
,
712 void __user
*buffer
, size_t *lenp
,
715 static inline bool perf_paranoid_tracepoint_raw(void)
717 return sysctl_perf_event_paranoid
> -1;
720 static inline bool perf_paranoid_cpu(void)
722 return sysctl_perf_event_paranoid
> 0;
725 static inline bool perf_paranoid_kernel(void)
727 return sysctl_perf_event_paranoid
> 1;
730 extern void perf_event_init(void);
731 extern void perf_tp_event(u64 addr
, u64 count
, void *record
,
732 int entry_size
, struct pt_regs
*regs
,
733 struct hlist_head
*head
, int rctx
,
734 struct task_struct
*task
);
735 extern void perf_bp_event(struct perf_event
*event
, void *data
);
737 #ifndef perf_misc_flags
738 # define perf_misc_flags(regs) \
739 (user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
740 # define perf_instruction_pointer(regs) instruction_pointer(regs)
743 static inline bool has_branch_stack(struct perf_event
*event
)
745 return event
->attr
.sample_type
& PERF_SAMPLE_BRANCH_STACK
;
748 extern int perf_output_begin(struct perf_output_handle
*handle
,
749 struct perf_event
*event
, unsigned int size
);
750 extern void perf_output_end(struct perf_output_handle
*handle
);
751 extern unsigned int perf_output_copy(struct perf_output_handle
*handle
,
752 const void *buf
, unsigned int len
);
753 extern unsigned int perf_output_skip(struct perf_output_handle
*handle
,
755 extern int perf_swevent_get_recursion_context(void);
756 extern void perf_swevent_put_recursion_context(int rctx
);
757 extern void perf_event_enable(struct perf_event
*event
);
758 extern void perf_event_disable(struct perf_event
*event
);
759 extern int __perf_event_disable(void *info
);
760 extern void perf_event_task_tick(void);
763 perf_event_task_sched_in(struct task_struct
*prev
,
764 struct task_struct
*task
) { }
766 perf_event_task_sched_out(struct task_struct
*prev
,
767 struct task_struct
*next
) { }
768 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
769 static inline void perf_event_exit_task(struct task_struct
*child
) { }
770 static inline void perf_event_free_task(struct task_struct
*task
) { }
771 static inline void perf_event_delayed_put(struct task_struct
*task
) { }
772 static inline void perf_event_print_debug(void) { }
773 static inline int perf_event_task_disable(void) { return -EINVAL
; }
774 static inline int perf_event_task_enable(void) { return -EINVAL
; }
775 static inline int perf_event_refresh(struct perf_event
*event
, int refresh
)
781 perf_sw_event(u32 event_id
, u64 nr
, struct pt_regs
*regs
, u64 addr
) { }
783 perf_bp_event(struct perf_event
*event
, void *data
) { }
785 static inline int perf_register_guest_info_callbacks
786 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
787 static inline int perf_unregister_guest_info_callbacks
788 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
790 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
791 static inline void perf_event_comm(struct task_struct
*tsk
) { }
792 static inline void perf_event_fork(struct task_struct
*tsk
) { }
793 static inline void perf_event_init(void) { }
794 static inline int perf_swevent_get_recursion_context(void) { return -1; }
795 static inline void perf_swevent_put_recursion_context(int rctx
) { }
796 static inline void perf_event_enable(struct perf_event
*event
) { }
797 static inline void perf_event_disable(struct perf_event
*event
) { }
798 static inline int __perf_event_disable(void *info
) { return -1; }
799 static inline void perf_event_task_tick(void) { }
802 #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_INTEL)
803 extern void perf_restore_debug_store(void);
805 static inline void perf_restore_debug_store(void) { }
808 #define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
811 * This has to have a higher priority than migration_notifier in sched.c.
813 #define perf_cpu_notifier(fn) \
815 static struct notifier_block fn##_nb __cpuinitdata = \
816 { .notifier_call = fn, .priority = CPU_PRI_PERF }; \
817 unsigned long cpu = smp_processor_id(); \
818 unsigned long flags; \
819 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
820 (void *)(unsigned long)cpu); \
821 local_irq_save(flags); \
822 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
823 (void *)(unsigned long)cpu); \
824 local_irq_restore(flags); \
825 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
826 (void *)(unsigned long)cpu); \
827 register_cpu_notifier(&fn##_nb); \
831 struct perf_pmu_events_attr
{
832 struct device_attribute attr
;
836 #define PMU_EVENT_ATTR(_name, _var, _id, _show) \
837 static struct perf_pmu_events_attr _var = { \
838 .attr = __ATTR(_name, 0444, _show, NULL), \
842 #define PMU_FORMAT_ATTR(_name, _format) \
844 _name##_show(struct device *dev, \
845 struct device_attribute *attr, \
848 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
849 return sprintf(page, _format "\n"); \
852 static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
854 #endif /* _LINUX_PERF_EVENT_H */