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 */
206 precise
: 1, /* OoO invariant counter */
211 __u32 wakeup_events
; /* wakeup every n events */
212 __u32 wakeup_watermark
; /* bytes before wakeup */
221 * Ioctls that can be done on a perf event fd:
223 #define PERF_EVENT_IOC_ENABLE _IO ('$', 0)
224 #define PERF_EVENT_IOC_DISABLE _IO ('$', 1)
225 #define PERF_EVENT_IOC_REFRESH _IO ('$', 2)
226 #define PERF_EVENT_IOC_RESET _IO ('$', 3)
227 #define PERF_EVENT_IOC_PERIOD _IOW('$', 4, __u64)
228 #define PERF_EVENT_IOC_SET_OUTPUT _IO ('$', 5)
229 #define PERF_EVENT_IOC_SET_FILTER _IOW('$', 6, char *)
231 enum perf_event_ioc_flags
{
232 PERF_IOC_FLAG_GROUP
= 1U << 0,
236 * Structure of the page that can be mapped via mmap
238 struct perf_event_mmap_page
{
239 __u32 version
; /* version number of this structure */
240 __u32 compat_version
; /* lowest version this is compat with */
243 * Bits needed to read the hw events in user-space.
253 * count = pmc_read(pc->index - 1);
254 * count += pc->offset;
259 * } while (pc->lock != seq);
261 * NOTE: for obvious reason this only works on self-monitoring
264 __u32 lock
; /* seqlock for synchronization */
265 __u32 index
; /* hardware event identifier */
266 __s64 offset
; /* add to hardware event value */
267 __u64 time_enabled
; /* time event active */
268 __u64 time_running
; /* time event on cpu */
271 * Hole for extension of the self monitor capabilities
274 __u64 __reserved
[123]; /* align to 1k */
277 * Control data for the mmap() data buffer.
279 * User-space reading the @data_head value should issue an rmb(), on
280 * SMP capable platforms, after reading this value -- see
281 * perf_event_wakeup().
283 * When the mapping is PROT_WRITE the @data_tail value should be
284 * written by userspace to reflect the last read data. In this case
285 * the kernel will not over-write unread data.
287 __u64 data_head
; /* head in the data section */
288 __u64 data_tail
; /* user-space written tail */
291 #define PERF_RECORD_MISC_CPUMODE_MASK (7 << 0)
292 #define PERF_RECORD_MISC_CPUMODE_UNKNOWN (0 << 0)
293 #define PERF_RECORD_MISC_KERNEL (1 << 0)
294 #define PERF_RECORD_MISC_USER (2 << 0)
295 #define PERF_RECORD_MISC_HYPERVISOR (3 << 0)
296 #define PERF_RECORD_MISC_GUEST_KERNEL (4 << 0)
297 #define PERF_RECORD_MISC_GUEST_USER (5 << 0)
299 #define PERF_RECORD_MISC_EXACT (1 << 14)
301 * Reserve the last bit to indicate some extended misc field
303 #define PERF_RECORD_MISC_EXT_RESERVED (1 << 15)
305 struct perf_event_header
{
311 enum perf_event_type
{
314 * The MMAP events record the PROT_EXEC mappings so that we can
315 * correlate userspace IPs to code. They have the following structure:
318 * struct perf_event_header header;
327 PERF_RECORD_MMAP
= 1,
331 * struct perf_event_header header;
336 PERF_RECORD_LOST
= 2,
340 * struct perf_event_header header;
346 PERF_RECORD_COMM
= 3,
350 * struct perf_event_header header;
356 PERF_RECORD_EXIT
= 4,
360 * struct perf_event_header header;
366 PERF_RECORD_THROTTLE
= 5,
367 PERF_RECORD_UNTHROTTLE
= 6,
371 * struct perf_event_header header;
377 PERF_RECORD_FORK
= 7,
381 * struct perf_event_header header;
384 * struct read_format values;
387 PERF_RECORD_READ
= 8,
391 * struct perf_event_header header;
393 * { u64 ip; } && PERF_SAMPLE_IP
394 * { u32 pid, tid; } && PERF_SAMPLE_TID
395 * { u64 time; } && PERF_SAMPLE_TIME
396 * { u64 addr; } && PERF_SAMPLE_ADDR
397 * { u64 id; } && PERF_SAMPLE_ID
398 * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
399 * { u32 cpu, res; } && PERF_SAMPLE_CPU
400 * { u64 period; } && PERF_SAMPLE_PERIOD
402 * { struct read_format values; } && PERF_SAMPLE_READ
405 * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
408 * # The RAW record below is opaque data wrt the ABI
410 * # That is, the ABI doesn't make any promises wrt to
411 * # the stability of its content, it may vary depending
412 * # on event, hardware, kernel version and phase of
415 * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
419 * char data[size];}&& PERF_SAMPLE_RAW
422 PERF_RECORD_SAMPLE
= 9,
424 PERF_RECORD_MAX
, /* non-ABI */
427 enum perf_callchain_context
{
428 PERF_CONTEXT_HV
= (__u64
)-32,
429 PERF_CONTEXT_KERNEL
= (__u64
)-128,
430 PERF_CONTEXT_USER
= (__u64
)-512,
432 PERF_CONTEXT_GUEST
= (__u64
)-2048,
433 PERF_CONTEXT_GUEST_KERNEL
= (__u64
)-2176,
434 PERF_CONTEXT_GUEST_USER
= (__u64
)-2560,
436 PERF_CONTEXT_MAX
= (__u64
)-4095,
439 #define PERF_FLAG_FD_NO_GROUP (1U << 0)
440 #define PERF_FLAG_FD_OUTPUT (1U << 1)
444 * Kernel-internal data types and definitions:
447 #ifdef CONFIG_PERF_EVENTS
448 # include <asm/perf_event.h>
451 struct perf_guest_info_callbacks
{
452 int (*is_in_guest
) (void);
453 int (*is_user_mode
) (void);
454 unsigned long (*get_guest_ip
) (void);
457 #ifdef CONFIG_HAVE_HW_BREAKPOINT
458 #include <asm/hw_breakpoint.h>
461 #include <linux/list.h>
462 #include <linux/mutex.h>
463 #include <linux/rculist.h>
464 #include <linux/rcupdate.h>
465 #include <linux/spinlock.h>
466 #include <linux/hrtimer.h>
467 #include <linux/fs.h>
468 #include <linux/pid_namespace.h>
469 #include <linux/workqueue.h>
470 #include <linux/ftrace.h>
471 #include <linux/cpu.h>
472 #include <asm/atomic.h>
474 #define PERF_MAX_STACK_DEPTH 255
476 struct perf_callchain_entry
{
478 __u64 ip
[PERF_MAX_STACK_DEPTH
];
481 struct perf_raw_record
{
486 struct perf_branch_entry
{
492 struct perf_branch_stack
{
494 struct perf_branch_entry entries
[0];
500 * struct hw_perf_event - performance event hardware details:
502 struct hw_perf_event
{
503 #ifdef CONFIG_PERF_EVENTS
505 struct { /* hardware */
508 unsigned long config_base
;
509 unsigned long event_base
;
513 struct { /* software */
515 struct hrtimer hrtimer
;
517 #ifdef CONFIG_HAVE_HW_BREAKPOINT
519 struct arch_hw_breakpoint info
;
522 atomic64_t prev_count
;
525 atomic64_t period_left
;
529 u64 freq_count_stamp
;
536 * struct pmu - generic performance monitoring unit
539 int (*enable
) (struct perf_event
*event
);
540 void (*disable
) (struct perf_event
*event
);
541 int (*start
) (struct perf_event
*event
);
542 void (*stop
) (struct perf_event
*event
);
543 void (*read
) (struct perf_event
*event
);
544 void (*unthrottle
) (struct perf_event
*event
);
548 * enum perf_event_active_state - the states of a event
550 enum perf_event_active_state
{
551 PERF_EVENT_STATE_ERROR
= -2,
552 PERF_EVENT_STATE_OFF
= -1,
553 PERF_EVENT_STATE_INACTIVE
= 0,
554 PERF_EVENT_STATE_ACTIVE
= 1,
559 struct perf_mmap_data
{
560 struct rcu_head rcu_head
;
561 #ifdef CONFIG_PERF_USE_VMALLOC
562 struct work_struct work
;
565 int nr_pages
; /* nr of data pages */
566 int writable
; /* are we writable */
567 int nr_locked
; /* nr pages mlocked */
569 atomic_t poll
; /* POLL_ for wakeups */
570 atomic_t events
; /* event_id limit */
572 atomic_long_t head
; /* write position */
573 atomic_long_t done_head
; /* completed head */
575 atomic_t lock
; /* concurrent writes */
576 atomic_t wakeup
; /* needs a wakeup */
577 atomic_t lost
; /* nr records lost */
579 long watermark
; /* wakeup watermark */
581 struct perf_event_mmap_page
*user_page
;
585 struct perf_pending_entry
{
586 struct perf_pending_entry
*next
;
587 void (*func
)(struct perf_pending_entry
*);
590 struct perf_sample_data
;
592 typedef void (*perf_overflow_handler_t
)(struct perf_event
*, int,
593 struct perf_sample_data
*,
594 struct pt_regs
*regs
);
596 enum perf_group_flag
{
597 PERF_GROUP_SOFTWARE
= 0x1,
600 #define SWEVENT_HLIST_BITS 8
601 #define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
603 struct swevent_hlist
{
604 struct hlist_head heads
[SWEVENT_HLIST_SIZE
];
605 struct rcu_head rcu_head
;
609 * struct perf_event - performance event kernel representation:
612 #ifdef CONFIG_PERF_EVENTS
613 struct list_head group_entry
;
614 struct list_head event_entry
;
615 struct list_head sibling_list
;
616 struct hlist_node hlist_entry
;
619 struct perf_event
*group_leader
;
620 struct perf_event
*output
;
621 const struct pmu
*pmu
;
623 enum perf_event_active_state state
;
627 * These are the total time in nanoseconds that the event
628 * has been enabled (i.e. eligible to run, and the task has
629 * been scheduled in, if this is a per-task event)
630 * and running (scheduled onto the CPU), respectively.
632 * They are computed from tstamp_enabled, tstamp_running and
633 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
635 u64 total_time_enabled
;
636 u64 total_time_running
;
639 * These are timestamps used for computing total_time_enabled
640 * and total_time_running when the event is in INACTIVE or
641 * ACTIVE state, measured in nanoseconds from an arbitrary point
643 * tstamp_enabled: the notional time when the event was enabled
644 * tstamp_running: the notional time when the event was scheduled on
645 * tstamp_stopped: in INACTIVE state, the notional time when the
646 * event was scheduled off.
652 struct perf_event_attr attr
;
653 struct hw_perf_event hw
;
655 struct perf_event_context
*ctx
;
659 * These accumulate total time (in nanoseconds) that children
660 * events have been enabled and running, respectively.
662 atomic64_t child_total_time_enabled
;
663 atomic64_t child_total_time_running
;
666 * Protect attach/detach and child_list:
668 struct mutex child_mutex
;
669 struct list_head child_list
;
670 struct perf_event
*parent
;
675 struct list_head owner_entry
;
676 struct task_struct
*owner
;
679 struct mutex mmap_mutex
;
681 struct perf_mmap_data
*data
;
684 wait_queue_head_t waitq
;
685 struct fasync_struct
*fasync
;
687 /* delayed work for NMIs and such */
691 struct perf_pending_entry pending
;
693 atomic_t event_limit
;
695 void (*destroy
)(struct perf_event
*);
696 struct rcu_head rcu_head
;
698 struct pid_namespace
*ns
;
701 perf_overflow_handler_t overflow_handler
;
703 #ifdef CONFIG_EVENT_TRACING
704 struct event_filter
*filter
;
707 #endif /* CONFIG_PERF_EVENTS */
711 * struct perf_event_context - event context structure
713 * Used as a container for task events and CPU events as well:
715 struct perf_event_context
{
717 * Protect the states of the events in the list,
718 * nr_active, and the list:
722 * Protect the list of events. Locking either mutex or lock
723 * is sufficient to ensure the list doesn't change; to change
724 * the list you need to lock both the mutex and the spinlock.
728 struct list_head pinned_groups
;
729 struct list_head flexible_groups
;
730 struct list_head event_list
;
736 struct task_struct
*task
;
739 * Context clock, runs when context enabled.
745 * These fields let us detect when two contexts have both
746 * been cloned (inherited) from a common ancestor.
748 struct perf_event_context
*parent_ctx
;
752 struct rcu_head rcu_head
;
756 * struct perf_event_cpu_context - per cpu event context structure
758 struct perf_cpu_context
{
759 struct perf_event_context ctx
;
760 struct perf_event_context
*task_ctx
;
764 struct swevent_hlist
*swevent_hlist
;
765 struct mutex hlist_mutex
;
769 * Recursion avoidance:
771 * task, softirq, irq, nmi context
776 struct perf_output_handle
{
777 struct perf_event
*event
;
778 struct perf_mmap_data
*data
;
780 unsigned long offset
;
786 #ifdef CONFIG_PERF_EVENTS
789 * Set by architecture code:
791 extern int perf_max_events
;
793 extern const struct pmu
*hw_perf_event_init(struct perf_event
*event
);
795 extern void perf_event_task_sched_in(struct task_struct
*task
);
796 extern void perf_event_task_sched_out(struct task_struct
*task
, struct task_struct
*next
);
797 extern void perf_event_task_tick(struct task_struct
*task
);
798 extern int perf_event_init_task(struct task_struct
*child
);
799 extern void perf_event_exit_task(struct task_struct
*child
);
800 extern void perf_event_free_task(struct task_struct
*task
);
801 extern void set_perf_event_pending(void);
802 extern void perf_event_do_pending(void);
803 extern void perf_event_print_debug(void);
804 extern void __perf_disable(void);
805 extern bool __perf_enable(void);
806 extern void perf_disable(void);
807 extern void perf_enable(void);
808 extern int perf_event_task_disable(void);
809 extern int perf_event_task_enable(void);
810 extern int hw_perf_group_sched_in(struct perf_event
*group_leader
,
811 struct perf_cpu_context
*cpuctx
,
812 struct perf_event_context
*ctx
);
813 extern void perf_event_update_userpage(struct perf_event
*event
);
814 extern int perf_event_release_kernel(struct perf_event
*event
);
815 extern struct perf_event
*
816 perf_event_create_kernel_counter(struct perf_event_attr
*attr
,
819 perf_overflow_handler_t callback
);
820 extern u64
perf_event_read_value(struct perf_event
*event
,
821 u64
*enabled
, u64
*running
);
823 struct perf_sample_data
{
840 struct perf_callchain_entry
*callchain
;
841 struct perf_raw_record
*raw
;
845 void perf_sample_data_init(struct perf_sample_data
*data
, u64 addr
)
851 extern void perf_output_sample(struct perf_output_handle
*handle
,
852 struct perf_event_header
*header
,
853 struct perf_sample_data
*data
,
854 struct perf_event
*event
);
855 extern void perf_prepare_sample(struct perf_event_header
*header
,
856 struct perf_sample_data
*data
,
857 struct perf_event
*event
,
858 struct pt_regs
*regs
);
860 extern int perf_event_overflow(struct perf_event
*event
, int nmi
,
861 struct perf_sample_data
*data
,
862 struct pt_regs
*regs
);
865 * Return 1 for a software event, 0 for a hardware event
867 static inline int is_software_event(struct perf_event
*event
)
869 switch (event
->attr
.type
) {
870 case PERF_TYPE_SOFTWARE
:
871 case PERF_TYPE_TRACEPOINT
:
872 /* for now the breakpoint stuff also works as software event */
873 case PERF_TYPE_BREAKPOINT
:
879 extern atomic_t perf_swevent_enabled
[PERF_COUNT_SW_MAX
];
881 extern void __perf_sw_event(u32
, u64
, int, struct pt_regs
*, u64
);
884 perf_arch_fetch_caller_regs(struct pt_regs
*regs
, unsigned long ip
, int skip
);
887 * Take a snapshot of the regs. Skip ip and frame pointer to
888 * the nth caller. We only need a few of the regs:
889 * - ip for PERF_SAMPLE_IP
890 * - cs for user_mode() tests
891 * - bp for callchains
892 * - eflags, for future purposes, just in case
894 static inline void perf_fetch_caller_regs(struct pt_regs
*regs
, int skip
)
898 memset(regs
, 0, sizeof(*regs
));
913 /* No need to support further for now */
918 return perf_arch_fetch_caller_regs(regs
, ip
, skip
);
922 perf_sw_event(u32 event_id
, u64 nr
, int nmi
, struct pt_regs
*regs
, u64 addr
)
924 if (atomic_read(&perf_swevent_enabled
[event_id
])) {
925 struct pt_regs hot_regs
;
928 perf_fetch_caller_regs(&hot_regs
, 1);
931 __perf_sw_event(event_id
, nr
, nmi
, regs
, addr
);
935 extern void __perf_event_mmap(struct vm_area_struct
*vma
);
937 static inline void perf_event_mmap(struct vm_area_struct
*vma
)
939 if (vma
->vm_flags
& VM_EXEC
)
940 __perf_event_mmap(vma
);
943 extern struct perf_guest_info_callbacks
*perf_guest_cbs
;
944 extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
945 extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks
*callbacks
);
947 extern void perf_event_comm(struct task_struct
*tsk
);
948 extern void perf_event_fork(struct task_struct
*tsk
);
950 extern struct perf_callchain_entry
*perf_callchain(struct pt_regs
*regs
);
952 extern int sysctl_perf_event_paranoid
;
953 extern int sysctl_perf_event_mlock
;
954 extern int sysctl_perf_event_sample_rate
;
956 static inline bool perf_paranoid_tracepoint_raw(void)
958 return sysctl_perf_event_paranoid
> -1;
961 static inline bool perf_paranoid_cpu(void)
963 return sysctl_perf_event_paranoid
> 0;
966 static inline bool perf_paranoid_kernel(void)
968 return sysctl_perf_event_paranoid
> 1;
971 extern void perf_event_init(void);
972 extern void perf_tp_event(int event_id
, u64 addr
, u64 count
, void *record
,
973 int entry_size
, struct pt_regs
*regs
);
974 extern void perf_bp_event(struct perf_event
*event
, void *data
);
976 #ifndef perf_misc_flags
977 #define perf_misc_flags(regs) (user_mode(regs) ? PERF_RECORD_MISC_USER : \
978 PERF_RECORD_MISC_KERNEL)
979 #define perf_instruction_pointer(regs) instruction_pointer(regs)
982 extern int perf_output_begin(struct perf_output_handle
*handle
,
983 struct perf_event
*event
, unsigned int size
,
984 int nmi
, int sample
);
985 extern void perf_output_end(struct perf_output_handle
*handle
);
986 extern void perf_output_copy(struct perf_output_handle
*handle
,
987 const void *buf
, unsigned int len
);
988 extern int perf_swevent_get_recursion_context(void);
989 extern void perf_swevent_put_recursion_context(int rctx
);
990 extern void perf_event_enable(struct perf_event
*event
);
991 extern void perf_event_disable(struct perf_event
*event
);
994 perf_event_task_sched_in(struct task_struct
*task
) { }
996 perf_event_task_sched_out(struct task_struct
*task
,
997 struct task_struct
*next
) { }
999 perf_event_task_tick(struct task_struct
*task
) { }
1000 static inline int perf_event_init_task(struct task_struct
*child
) { return 0; }
1001 static inline void perf_event_exit_task(struct task_struct
*child
) { }
1002 static inline void perf_event_free_task(struct task_struct
*task
) { }
1003 static inline void perf_event_do_pending(void) { }
1004 static inline void perf_event_print_debug(void) { }
1005 static inline void perf_disable(void) { }
1006 static inline void perf_enable(void) { }
1007 static inline int perf_event_task_disable(void) { return -EINVAL
; }
1008 static inline int perf_event_task_enable(void) { return -EINVAL
; }
1011 perf_sw_event(u32 event_id
, u64 nr
, int nmi
,
1012 struct pt_regs
*regs
, u64 addr
) { }
1014 perf_bp_event(struct perf_event
*event
, void *data
) { }
1016 static inline int perf_register_guest_info_callbacks
1017 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
1018 static inline int perf_unregister_guest_info_callbacks
1019 (struct perf_guest_info_callbacks
*callbacks
) { return 0; }
1021 static inline void perf_event_mmap(struct vm_area_struct
*vma
) { }
1022 static inline void perf_event_comm(struct task_struct
*tsk
) { }
1023 static inline void perf_event_fork(struct task_struct
*tsk
) { }
1024 static inline void perf_event_init(void) { }
1025 static inline int perf_swevent_get_recursion_context(void) { return -1; }
1026 static inline void perf_swevent_put_recursion_context(int rctx
) { }
1027 static inline void perf_event_enable(struct perf_event
*event
) { }
1028 static inline void perf_event_disable(struct perf_event
*event
) { }
1031 #define perf_output_put(handle, x) \
1032 perf_output_copy((handle), &(x), sizeof(x))
1035 * This has to have a higher priority than migration_notifier in sched.c.
1037 #define perf_cpu_notifier(fn) \
1039 static struct notifier_block fn##_nb __cpuinitdata = \
1040 { .notifier_call = fn, .priority = 20 }; \
1041 fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE, \
1042 (void *)(unsigned long)smp_processor_id()); \
1043 fn(&fn##_nb, (unsigned long)CPU_STARTING, \
1044 (void *)(unsigned long)smp_processor_id()); \
1045 fn(&fn##_nb, (unsigned long)CPU_ONLINE, \
1046 (void *)(unsigned long)smp_processor_id()); \
1047 register_cpu_notifier(&fn##_nb); \
1050 #endif /* __KERNEL__ */
1051 #endif /* _LINUX_PERF_EVENT_H */