4 * Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
5 * Copyright (C) 2008-2009, Red Hat, Inc., Ingo Molnar
6 * Copyright (C) 2008-2009, 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 <linux/types.h>
18 #include <linux/ioctl.h>
19 #include <asm/byteorder.h>
22 * User-space ABI bits:
29 PERF_TYPE_HARDWARE
= 0,
30 PERF_TYPE_SOFTWARE
= 1,
31 PERF_TYPE_TRACEPOINT
= 2,
32 PERF_TYPE_HW_CACHE
= 3,
34 PERF_TYPE_BREAKPOINT
= 5,
36 PERF_TYPE_MAX
, /* non-ABI */
40 * Generalized performance event event_id types, used by the
41 * attr.event_id parameter of the sys_perf_event_open()
46 * Common hardware events, generalized by the kernel:
48 PERF_COUNT_HW_CPU_CYCLES
= 0,
49 PERF_COUNT_HW_INSTRUCTIONS
= 1,
50 PERF_COUNT_HW_CACHE_REFERENCES
= 2,
51 PERF_COUNT_HW_CACHE_MISSES
= 3,
52 PERF_COUNT_HW_BRANCH_INSTRUCTIONS
= 4,
53 PERF_COUNT_HW_BRANCH_MISSES
= 5,
54 PERF_COUNT_HW_BUS_CYCLES
= 6,
56 PERF_COUNT_HW_MAX
, /* non-ABI */
60 * Generalized hardware cache events:
62 * { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
63 * { read, write, prefetch } x
64 * { accesses, misses }
66 enum perf_hw_cache_id
{
67 PERF_COUNT_HW_CACHE_L1D
= 0,
68 PERF_COUNT_HW_CACHE_L1I
= 1,
69 PERF_COUNT_HW_CACHE_LL
= 2,
70 PERF_COUNT_HW_CACHE_DTLB
= 3,
71 PERF_COUNT_HW_CACHE_ITLB
= 4,
72 PERF_COUNT_HW_CACHE_BPU
= 5,
74 PERF_COUNT_HW_CACHE_MAX
, /* non-ABI */
77 enum perf_hw_cache_op_id
{
78 PERF_COUNT_HW_CACHE_OP_READ
= 0,
79 PERF_COUNT_HW_CACHE_OP_WRITE
= 1,
80 PERF_COUNT_HW_CACHE_OP_PREFETCH
= 2,
82 PERF_COUNT_HW_CACHE_OP_MAX
, /* non-ABI */
85 enum perf_hw_cache_op_result_id
{
86 PERF_COUNT_HW_CACHE_RESULT_ACCESS
= 0,
87 PERF_COUNT_HW_CACHE_RESULT_MISS
= 1,
89 PERF_COUNT_HW_CACHE_RESULT_MAX
, /* non-ABI */
93 * Special "software" events provided by the kernel, even if the hardware
94 * does not support performance events. These events measure various
95 * physical and sw events of the kernel (and allow the profiling of them as
99 PERF_COUNT_SW_CPU_CLOCK
= 0,
100 PERF_COUNT_SW_TASK_CLOCK
= 1,
101 PERF_COUNT_SW_PAGE_FAULTS
= 2,
102 PERF_COUNT_SW_CONTEXT_SWITCHES
= 3,
103 PERF_COUNT_SW_CPU_MIGRATIONS
= 4,
104 PERF_COUNT_SW_PAGE_FAULTS_MIN
= 5,
105 PERF_COUNT_SW_PAGE_FAULTS_MAJ
= 6,
106 PERF_COUNT_SW_ALIGNMENT_FAULTS
= 7,
107 PERF_COUNT_SW_EMULATION_FAULTS
= 8,
109 PERF_COUNT_SW_MAX
, /* non-ABI */
113 * Bits that can be set in attr.sample_type to request information
114 * in the overflow packets.
116 enum perf_event_sample_format
{
117 PERF_SAMPLE_IP
= 1U << 0,
118 PERF_SAMPLE_TID
= 1U << 1,
119 PERF_SAMPLE_TIME
= 1U << 2,
120 PERF_SAMPLE_ADDR
= 1U << 3,
121 PERF_SAMPLE_READ
= 1U << 4,
122 PERF_SAMPLE_CALLCHAIN
= 1U << 5,
123 PERF_SAMPLE_ID
= 1U << 6,
124 PERF_SAMPLE_CPU
= 1U << 7,
125 PERF_SAMPLE_PERIOD
= 1U << 8,
126 PERF_SAMPLE_STREAM_ID
= 1U << 9,
127 PERF_SAMPLE_RAW
= 1U << 10,
129 PERF_SAMPLE_MAX
= 1U << 11, /* non-ABI */
133 * The format of the data returned by read() on a perf event fd,
134 * as specified by attr.read_format:
136 * struct read_format {
138 * { u64 time_enabled; } && PERF_FORMAT_ENABLED
139 * { u64 time_running; } && PERF_FORMAT_RUNNING
140 * { u64 id; } && PERF_FORMAT_ID
141 * } && !PERF_FORMAT_GROUP
144 * { u64 time_enabled; } && PERF_FORMAT_ENABLED
145 * { u64 time_running; } && PERF_FORMAT_RUNNING
147 * { u64 id; } && PERF_FORMAT_ID
149 * } && PERF_FORMAT_GROUP
152 enum perf_event_read_format
{
153 PERF_FORMAT_TOTAL_TIME_ENABLED
= 1U << 0,
154 PERF_FORMAT_TOTAL_TIME_RUNNING
= 1U << 1,
155 PERF_FORMAT_ID
= 1U << 2,
156 PERF_FORMAT_GROUP
= 1U << 3,
158 PERF_FORMAT_MAX
= 1U << 4, /* non-ABI */
161 #define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
164 * Hardware event_id to monitor via a performance monitoring event:
166 struct perf_event_attr
{
169 * Major type: hardware/software/tracepoint/etc.
174 * Size of the attr structure, for fwd/bwd compat.
179 * Type specific configuration information.
191 __u64 disabled
: 1, /* off by default */
192 inherit
: 1, /* children inherit it */
193 pinned
: 1, /* must always be on PMU */
194 exclusive
: 1, /* only group on PMU */
195 exclude_user
: 1, /* don't count user */
196 exclude_kernel
: 1, /* ditto kernel */
197 exclude_hv
: 1, /* ditto hypervisor */
198 exclude_idle
: 1, /* don't count when idle */
199 mmap
: 1, /* include mmap data */
200 comm
: 1, /* include comm data */
201 freq
: 1, /* use freq, not period */
202 inherit_stat
: 1, /* per task counts */
203 enable_on_exec
: 1, /* next exec enables */
204 task
: 1, /* trace fork/exit */
205 watermark
: 1, /* wakeup_watermark */
210 __u32 wakeup_events
; /* wakeup every n events */
211 __u32 wakeup_watermark
; /* bytes before wakeup */
220 * Ioctls that can be done on a perf event fd:
222 #define PERF_EVENT_IOC_ENABLE _IO ('$', 0)
223 #define PERF_EVENT_IOC_DISABLE _IO ('$', 1)
224 #define PERF_EVENT_IOC_REFRESH _IO ('$', 2)
225 #define PERF_EVENT_IOC_RESET _IO ('$', 3)
226 #define PERF_EVENT_IOC_PERIOD _IOW('$', 4, __u64)
227 #define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5)
228 #define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *)
230 enum perf_event_ioc_flags
{
231 PERF_IOC_FLAG_GROUP
= 1U << 0,
235 * Structure of the page that can be mapped via mmap
237 struct perf_event_mmap_page
{
238 __u32 version
; /* version number of this structure */
239 __u32 compat_version
; /* lowest version this is compat with */
242 * Bits needed to read the hw events in user-space.
252 * count = pmc_read(pc->index - 1);
253 * count += pc->offset;
258 * } while (pc->lock != seq);
260 * NOTE: for obvious reason this only works on self-monitoring
263 __u32 lock
; /* seqlock for synchronization */
264 __u32 index
; /* hardware event identifier */
265 __s64 offset
; /* add to hardware event value */
266 __u64 time_enabled
; /* time event active */
267 __u64 time_running
; /* time event on cpu */
270 * Hole for extension of the self monitor capabilities
273 __u64 __reserved
[123]; /* align to 1k */
276 * Control data for the mmap() data buffer.
278 * User-space reading the @data_head value should issue an rmb(), on
279 * SMP capable platforms, after reading this value -- see
280 * perf_event_wakeup().
282 * When the mapping is PROT_WRITE the @data_tail value should be
283 * written by userspace to reflect the last read data. In this case
284 * the kernel will not over-write unread data.
286 __u64 data_head
; /* head in the data section */
287 __u64 data_tail
; /* user-space written tail */
290 #define PERF_RECORD_MISC_CPUMODE_MASK (3 << 0)
291 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
292 #define PERF_RECORD_MISC_KERNEL (1 << 0)
293 #define PERF_RECORD_MISC_USER (2 << 0)
294 #define PERF_RECORD_MISC_HYPERVISOR (3 << 0)
296 struct perf_event_header
{
302 enum perf_event_type
{
305 * The MMAP events record the PROT_EXEC mappings so that we can
306 * correlate userspace IPs to code. They have the following structure:
309 * struct perf_event_header header;
318 PERF_RECORD_MMAP
= 1,
322 * struct perf_event_header header;
327 PERF_RECORD_LOST
= 2,
331 * struct perf_event_header header;
337 PERF_RECORD_COMM
= 3,
341 * struct perf_event_header header;
347 PERF_RECORD_EXIT
= 4,
351 * struct perf_event_header header;
357 PERF_RECORD_THROTTLE
= 5,
358 PERF_RECORD_UNTHROTTLE
= 6,
362 * struct perf_event_header header;
368 PERF_RECORD_FORK
= 7,
372 * struct perf_event_header header;
375 * struct read_format values;
378 PERF_RECORD_READ
= 8,
382 * struct perf_event_header header;
384 * { u64 ip; } && PERF_SAMPLE_IP
385 * { u32 pid, tid; } && PERF_SAMPLE_TID
386 * { u64 time; } && PERF_SAMPLE_TIME
387 * { u64 addr; } && PERF_SAMPLE_ADDR
388 * { u64 id; } && PERF_SAMPLE_ID
389 * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
390 * { u32 cpu, res; } && PERF_SAMPLE_CPU
391 * { u64 period; } && PERF_SAMPLE_PERIOD
393 * { struct read_format values; } && PERF_SAMPLE_READ
396 * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
399 * # The RAW record below is opaque data wrt the ABI
401 * # That is, the ABI doesn't make any promises wrt to
402 * # the stability of its content, it may vary depending
403 * # on event, hardware, kernel version and phase of
406 * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
410 * char data[size];}&& PERF_SAMPLE_RAW
413 PERF_RECORD_SAMPLE
= 9,
415 PERF_RECORD_MAX
, /* non-ABI */
418 enum perf_callchain_context
{
419 PERF_CONTEXT_HV
= (__u64
)-32,
420 PERF_CONTEXT_KERNEL
= (__u64
)-128,
421 PERF_CONTEXT_USER
= (__u64
)-512,
423 PERF_CONTEXT_GUEST
= (__u64
)-2048,
424 PERF_CONTEXT_GUEST_KERNEL
= (__u64
)-2176,
425 PERF_CONTEXT_GUEST_USER
= (__u64
)-2560,
427 PERF_CONTEXT_MAX
= (__u64
)-4095,
430 #define PERF_FLAG_FD_NO_GROUP (1U << 0)
431 #define PERF_FLAG_FD_OUTPUT (1U << 1)
435 * Kernel-internal data types and definitions:
438 #ifdef CONFIG_PERF_EVENTS
439 # include <asm/perf_event.h>
442 #ifdef CONFIG_HAVE_HW_BREAKPOINT
443 #include <asm/hw_breakpoint.h>
446 #include <linux/list.h>
447 #include <linux/mutex.h>
448 #include <linux/rculist.h>
449 #include <linux/rcupdate.h>
450 #include <linux/spinlock.h>
451 #include <linux/hrtimer.h>
452 #include <linux/fs.h>
453 #include <linux/pid_namespace.h>
454 #include <linux/workqueue.h>
455 #include <asm/atomic.h>
457 #define PERF_MAX_STACK_DEPTH 255
459 struct perf_callchain_entry
{
461 __u64 ip
[PERF_MAX_STACK_DEPTH
];
464 struct perf_raw_record
{
472 * struct hw_perf_event - performance event hardware details:
474 struct hw_perf_event
{
475 #ifdef CONFIG_PERF_EVENTS
477 struct { /* hardware */
479 unsigned long config_base
;
480 unsigned long event_base
;
483 struct { /* software */
485 struct hrtimer hrtimer
;
487 #ifdef CONFIG_HAVE_HW_BREAKPOINT
488 union { /* breakpoint */
489 struct arch_hw_breakpoint info
;
493 atomic64_t prev_count
;
496 atomic64_t period_left
;
508 * struct pmu - generic performance monitoring unit
511 int (*enable
) (struct perf_event
*event
);
512 void (*disable
) (struct perf_event
*event
);
513 void (*read
) (struct perf_event
*event
);
514 void (*unthrottle
) (struct perf_event
*event
);
518 * enum perf_event_active_state - the states of a event
520 enum perf_event_active_state
{
521 PERF_EVENT_STATE_ERROR
= -2,
522 PERF_EVENT_STATE_OFF
= -1,
523 PERF_EVENT_STATE_INACTIVE
= 0,
524 PERF_EVENT_STATE_ACTIVE
= 1,
529 struct perf_mmap_data
{
530 struct rcu_head rcu_head
;
531 #ifdef CONFIG_PERF_USE_VMALLOC
532 struct work_struct work
;
535 int nr_pages
; /* nr of data pages */
536 int writable
; /* are we writable */
537 int nr_locked
; /* nr pages mlocked */
539 atomic_t poll
; /* POLL_ for wakeups */
540 atomic_t events
; /* event_id limit */
542 atomic_long_t head
; /* write position */
543 atomic_long_t done_head
; /* completed head */
545 atomic_t lock
; /* concurrent writes */
546 atomic_t wakeup
; /* needs a wakeup */
547 atomic_t lost
; /* nr records lost */
549 long watermark
; /* wakeup watermark */
551 struct perf_event_mmap_page
*user_page
;
555 struct perf_pending_entry
{
556 struct perf_pending_entry
*next
;
557 void (*func
)(struct perf_pending_entry
*);
560 struct perf_sample_data
;
562 typedef void (*perf_overflow_handler_t
)(struct perf_event
*, int,
563 struct perf_sample_data
*,
564 struct pt_regs
*regs
);
567 * struct perf_event - performance event kernel representation:
570 #ifdef CONFIG_PERF_EVENTS
571 struct list_head group_entry
;
572 struct list_head event_entry
;
573 struct list_head sibling_list
;
575 struct perf_event
*group_leader
;
576 struct perf_event
*output
;
577 const struct pmu
*pmu
;
579 enum perf_event_active_state state
;
583 * These are the total time in nanoseconds that the event
584 * has been enabled (i.e. eligible to run, and the task has
585 * been scheduled in, if this is a per-task event)
586 * and running (scheduled onto the CPU), respectively.
588 * They are computed from tstamp_enabled, tstamp_running and
589 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
591 u64 total_time_enabled
;
592 u64 total_time_running
;
595 * These are timestamps used for computing total_time_enabled
596 * and total_time_running when the event is in INACTIVE or
597 * ACTIVE state, measured in nanoseconds from an arbitrary point
599 * tstamp_enabled: the notional time when the event was enabled
600 * tstamp_running: the notional time when the event was scheduled on
601 * tstamp_stopped: in INACTIVE state, the notional time when the
602 * event was scheduled off.
608 struct perf_event_attr attr
;
609 struct hw_perf_event hw
;
611 struct perf_event_context
*ctx
;
615 * These accumulate total time (in nanoseconds) that children
616 * events have been enabled and running, respectively.
618 atomic64_t child_total_time_enabled
;
619 atomic64_t child_total_time_running
;
622 * Protect attach/detach and child_list:
624 struct mutex child_mutex
;
625 struct list_head child_list
;
626 struct perf_event
*parent
;
631 struct list_head owner_entry
;
632 struct task_struct
*owner
;
635 struct mutex mmap_mutex
;
637 struct perf_mmap_data
*data
;
640 wait_queue_head_t waitq
;
641 struct fasync_struct
*fasync
;
643 /* delayed work for NMIs and such */
647 struct perf_pending_entry pending
;
649 atomic_t event_limit
;
651 void (*destroy
)(struct perf_event
*);
652 struct rcu_head rcu_head
;
654 struct pid_namespace
*ns
;
657 perf_overflow_handler_t overflow_handler
;
659 #ifdef CONFIG_EVENT_PROFILE
660 struct event_filter
*filter
;
663 #endif /* CONFIG_PERF_EVENTS */
667 * struct perf_event_context - event context structure
669 * Used as a container for task events and CPU events as well:
671 struct perf_event_context
{
673 * Protect the states of the events in the list,
674 * nr_active, and the list:
678 * Protect the list of events. Locking either mutex or lock
679 * is sufficient to ensure the list doesn't change; to change
680 * the list you need to lock both the mutex and the spinlock.
684 struct list_head group_list
;
685 struct list_head event_list
;
691 struct task_struct
*task
;
694 * Context clock, runs when context enabled.
700 * These fields let us detect when two contexts have both
701 * been cloned (inherited) from a common ancestor.
703 struct perf_event_context
*parent_ctx
;
707 struct rcu_head rcu_head
;
711 * struct perf_event_cpu_context - per cpu event context structure
713 struct perf_cpu_context
{
714 struct perf_event_context ctx
;
715 struct perf_event_context
*task_ctx
;
721 * Recursion avoidance:
723 * task, softirq, irq, nmi context
728 struct perf_output_handle
{
729 struct perf_event
*event
;
730 struct perf_mmap_data
*data
;
732 unsigned long offset
;
738 #ifdef CONFIG_PERF_EVENTS
741 * Set by architecture code:
743 extern int perf_max_events
;
745 extern const struct pmu
*hw_perf_event_init(struct perf_event
*event
);
747 extern void perf_event_task_sched_in(struct task_struct
*task
, int cpu
);
748 extern void perf_event_task_sched_out(struct task_struct
*task
,
749 struct task_struct
*next
, int cpu
);
750 extern void perf_event_task_tick(struct task_struct
*task
, int cpu
);
751 extern int perf_event_init_task(struct task_struct
*child
);
752 extern void perf_event_exit_task(struct task_struct
*child
);
753 extern void perf_event_free_task(struct task_struct
*task
);
754 extern void set_perf_event_pending(void);
755 extern void perf_event_do_pending(void);
756 extern void perf_event_print_debug(void);
757 extern void __perf_disable(void);
758 extern bool __perf_enable(void);
759 extern void perf_disable(void);
760 extern void perf_enable(void);
761 extern int perf_event_task_disable(void);
762 extern int perf_event_task_enable(void);
763 extern int hw_perf_group_sched_in(struct perf_event
*group_leader
,
764 struct perf_cpu_context
*cpuctx
,
765 struct perf_event_context
*ctx
, int cpu
);
766 extern void perf_event_update_userpage(struct perf_event
*event
);
767 extern int perf_event_release_kernel(struct perf_event
*event
);
768 extern struct perf_event
*
769 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
772 perf_overflow_handler_t callback
);
773 extern u64
perf_event_read_value(struct perf_event
*event
,
774 u64
*enabled
, u64
*running
);
776 struct perf_sample_data
{
793 struct perf_callchain_entry
*callchain
;
794 struct perf_raw_record
*raw
;
797 extern void perf_output_sample(struct perf_output_handle
*handle
,
798 struct perf_event_header
*header
,
799 struct perf_sample_data
*data
,
800 struct perf_event
*event
);
801 extern void perf_prepare_sample(struct perf_event_header
*header
,
802 struct perf_sample_data
*data
,
803 struct perf_event
*event
,
804 struct pt_regs
*regs
);
806 extern int perf_event_overflow(struct perf_event
*event
, int nmi
,
807 struct perf_sample_data
*data
,
808 struct pt_regs
*regs
);
811 * Return 1 for a software event, 0 for a hardware event
813 static inline int is_software_event(struct perf_event
*event
)
815 switch (event
->attr
.type
) {
816 case PERF_TYPE_SOFTWARE
:
817 case PERF_TYPE_TRACEPOINT
:
818 /* for now the breakpoint stuff also works as software event */
819 case PERF_TYPE_BREAKPOINT
:
825 extern atomic_t perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
827 extern void __perf_sw_event(u32
, u64
, int, struct pt_regs
*, u64
);
830 perf_sw_event(u32 event_id
, u64 nr
, int nmi
, struct pt_regs
*regs
, u64 addr
)
832 if (atomic_read(&perf_swevent_enabled
[event_id
]))
833 __perf_sw_event(event_id
, nr
, nmi
, regs
, addr
);
836 extern void __perf_event_mmap(struct vm_area_struct
*vma
);
838 static inline void perf_event_mmap(struct vm_area_struct
*vma
)
840 if (vma
->vm_flags
& VM_EXEC
)
841 __perf_event_mmap(vma
);
844 extern void perf_event_comm(struct task_struct
*tsk
);
845 extern void perf_event_fork(struct task_struct
*tsk
);
847 extern struct perf_callchain_entry
*perf_callchain(struct pt_regs
*regs
);
849 extern int sysctl_perf_event_paranoid
;
850 extern int sysctl_perf_event_mlock
;
851 extern int sysctl_perf_event_sample_rate
;
853 extern void perf_event_init(void);
854 extern void perf_tp_event(int event_id
, u64 addr
, u64 count
,
855 void *record
, int entry_size
);
856 extern void perf_bp_event(struct perf_event
*event
, void *data
);
858 #ifndef perf_misc_flags
859 #define perf_misc_flags(regs) (user_mode(regs) ? PERF_RECORD_MISC_USER : \
860 PERF_RECORD_MISC_KERNEL)
861 #define perf_instruction_pointer(regs) instruction_pointer(regs)
864 extern int perf_output_begin(struct perf_output_handle
*handle
,
865 struct perf_event
*event
, unsigned int size
,
866 int nmi
, int sample
);
867 extern void perf_output_end(struct perf_output_handle
*handle
);
868 extern void perf_output_copy(struct perf_output_handle
*handle
,
869 const void *buf
, unsigned int len
);
870 extern int perf_swevent_get_recursion_context(void);
871 extern void perf_swevent_put_recursion_context(int rctx
);
872 extern void perf_event_enable(struct perf_event
*event
);
873 extern void perf_event_disable(struct perf_event
*event
);
876 perf_event_task_sched_in(struct task_struct
*task
, int cpu
) { }
878 perf_event_task_sched_out(struct task_struct
*task
,
879 struct task_struct
*next
, int cpu
) { }
881 perf_event_task_tick(struct task_struct
*task
, int cpu
) { }
882 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
883 static inline void perf_event_exit_task(struct task_struct
*child
) { }
884 static inline void perf_event_free_task(struct task_struct
*task
) { }
885 static inline void perf_event_do_pending(void) { }
886 static inline void perf_event_print_debug(void) { }
887 static inline void perf_disable(void) { }
888 static inline void perf_enable(void) { }
889 static inline int perf_event_task_disable(void) { return -EINVAL
; }
890 static inline int perf_event_task_enable(void) { return -EINVAL
; }
893 perf_sw_event(u32 event_id
, u64 nr
, int nmi
,
894 struct pt_regs
*regs
, u64 addr
) { }
896 perf_bp_event(struct perf_event
*event
, void *data
) { }
898 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
899 static inline void perf_event_comm(struct task_struct
*tsk
) { }
900 static inline void perf_event_fork(struct task_struct
*tsk
) { }
901 static inline void perf_event_init(void) { }
902 static inline int perf_swevent_get_recursion_context(void) { return -1; }
903 static inline void perf_swevent_put_recursion_context(int rctx
) { }
904 static inline void perf_event_enable(struct perf_event
*event
) { }
905 static inline void perf_event_disable(struct perf_event
*event
) { }
908 #define perf_output_put(handle, x) \
909 perf_output_copy((handle), &(x), sizeof(x))
911 #endif /* __KERNEL__ */
912 #endif /* _LINUX_PERF_EVENT_H */