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perf_counter: Allow for a wakeup watermark
[linux-2.6/kvm.git] / include / linux / perf_counter.h
blob6c1ef72ea501967e472b24efa54da5cf348cd5fe
1 /*
2 * Performance counters:
3 *
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
7 *
8 * Data type definitions, declarations, prototypes.
9 *
10 * Started by: Thomas Gleixner and Ingo Molnar
11 *
12 * For licencing details see kernel-base/COPYING
13 */
14 #ifndef _LINUX_PERF_COUNTER_H
15 #define _LINUX_PERF_COUNTER_H
16
17 #include <linux/types.h>
18 #include <linux/ioctl.h>
19 #include <asm/byteorder.h>
20
21 /*
22 * User-space ABI bits:
23 */
24
25 /*
26 * attr.type
27 */
28 enum perf_type_id {
29 PERF_TYPE_HARDWARE = 0,
30 PERF_TYPE_SOFTWARE = 1,
31 PERF_TYPE_TRACEPOINT = 2,
32 PERF_TYPE_HW_CACHE = 3,
33 PERF_TYPE_RAW = 4,
34
35 PERF_TYPE_MAX, /* non-ABI */
36 };
37
38 /*
39 * Generalized performance counter event types, used by the
40 * attr.event_id parameter of the sys_perf_counter_open()
41 * syscall:
42 */
43 enum perf_hw_id {
44 /*
45 * Common hardware events, generalized by the kernel:
46 */
47 PERF_COUNT_HW_CPU_CYCLES = 0,
48 PERF_COUNT_HW_INSTRUCTIONS = 1,
49 PERF_COUNT_HW_CACHE_REFERENCES = 2,
50 PERF_COUNT_HW_CACHE_MISSES = 3,
51 PERF_COUNT_HW_BRANCH_INSTRUCTIONS = 4,
52 PERF_COUNT_HW_BRANCH_MISSES = 5,
53 PERF_COUNT_HW_BUS_CYCLES = 6,
54
55 PERF_COUNT_HW_MAX, /* non-ABI */
56 };
57
58 /*
59 * Generalized hardware cache counters:
60 *
61 * { L1-D, L1-I, LLC, ITLB, DTLB, BPU } x
62 * { read, write, prefetch } x
63 * { accesses, misses }
64 */
65 enum perf_hw_cache_id {
66 PERF_COUNT_HW_CACHE_L1D = 0,
67 PERF_COUNT_HW_CACHE_L1I = 1,
68 PERF_COUNT_HW_CACHE_LL = 2,
69 PERF_COUNT_HW_CACHE_DTLB = 3,
70 PERF_COUNT_HW_CACHE_ITLB = 4,
71 PERF_COUNT_HW_CACHE_BPU = 5,
72
73 PERF_COUNT_HW_CACHE_MAX, /* non-ABI */
74 };
75
76 enum perf_hw_cache_op_id {
77 PERF_COUNT_HW_CACHE_OP_READ = 0,
78 PERF_COUNT_HW_CACHE_OP_WRITE = 1,
79 PERF_COUNT_HW_CACHE_OP_PREFETCH = 2,
80
81 PERF_COUNT_HW_CACHE_OP_MAX, /* non-ABI */
82 };
83
84 enum perf_hw_cache_op_result_id {
85 PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
86 PERF_COUNT_HW_CACHE_RESULT_MISS = 1,
87
88 PERF_COUNT_HW_CACHE_RESULT_MAX, /* non-ABI */
89 };
90
91 /*
92 * Special "software" counters provided by the kernel, even if the hardware
93 * does not support performance counters. These counters measure various
94 * physical and sw events of the kernel (and allow the profiling of them as
95 * well):
96 */
97 enum perf_sw_ids {
98 PERF_COUNT_SW_CPU_CLOCK = 0,
99 PERF_COUNT_SW_TASK_CLOCK = 1,
100 PERF_COUNT_SW_PAGE_FAULTS = 2,
101 PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
102 PERF_COUNT_SW_CPU_MIGRATIONS = 4,
103 PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
104 PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
105
106 PERF_COUNT_SW_MAX, /* non-ABI */
107 };
108
109 /*
110 * Bits that can be set in attr.sample_type to request information
111 * in the overflow packets.
112 */
113 enum perf_counter_sample_format {
114 PERF_SAMPLE_IP = 1U << 0,
115 PERF_SAMPLE_TID = 1U << 1,
116 PERF_SAMPLE_TIME = 1U << 2,
117 PERF_SAMPLE_ADDR = 1U << 3,
118 PERF_SAMPLE_READ = 1U << 4,
119 PERF_SAMPLE_CALLCHAIN = 1U << 5,
120 PERF_SAMPLE_ID = 1U << 6,
121 PERF_SAMPLE_CPU = 1U << 7,
122 PERF_SAMPLE_PERIOD = 1U << 8,
123 PERF_SAMPLE_STREAM_ID = 1U << 9,
124 PERF_SAMPLE_RAW = 1U << 10,
125
126 PERF_SAMPLE_MAX = 1U << 11, /* non-ABI */
127 };
128
129 /*
130 * The format of the data returned by read() on a perf counter fd,
131 * as specified by attr.read_format:
132 *
133 * struct read_format {
134 * { u64 value;
135 * { u64 time_enabled; } && PERF_FORMAT_ENABLED
136 * { u64 time_running; } && PERF_FORMAT_RUNNING
137 * { u64 id; } && PERF_FORMAT_ID
138 * } && !PERF_FORMAT_GROUP
139 *
140 * { u64 nr;
141 * { u64 time_enabled; } && PERF_FORMAT_ENABLED
142 * { u64 time_running; } && PERF_FORMAT_RUNNING
143 * { u64 value;
144 * { u64 id; } && PERF_FORMAT_ID
145 * } cntr[nr];
146 * } && PERF_FORMAT_GROUP
147 * };
148 */
149 enum perf_counter_read_format {
150 PERF_FORMAT_TOTAL_TIME_ENABLED = 1U << 0,
151 PERF_FORMAT_TOTAL_TIME_RUNNING = 1U << 1,
152 PERF_FORMAT_ID = 1U << 2,
153 PERF_FORMAT_GROUP = 1U << 3,
154
155 PERF_FORMAT_MAX = 1U << 4, /* non-ABI */
156 };
157
158 #define PERF_ATTR_SIZE_VER0 64 /* sizeof first published struct */
159
160 /*
161 * Hardware event to monitor via a performance monitoring counter:
162 */
163 struct perf_counter_attr {
164
165 /*
166 * Major type: hardware/software/tracepoint/etc.
167 */
168 __u32 type;
169
170 /*
171 * Size of the attr structure, for fwd/bwd compat.
172 */
173 __u32 size;
174
175 /*
176 * Type specific configuration information.
177 */
178 __u64 config;
179
180 union {
181 __u64 sample_period;
182 __u64 sample_freq;
183 };
184
185 __u64 sample_type;
186 __u64 read_format;
187
188 __u64 disabled : 1, /* off by default */
189 inherit : 1, /* children inherit it */
190 pinned : 1, /* must always be on PMU */
191 exclusive : 1, /* only group on PMU */
192 exclude_user : 1, /* don't count user */
193 exclude_kernel : 1, /* ditto kernel */
194 exclude_hv : 1, /* ditto hypervisor */
195 exclude_idle : 1, /* don't count when idle */
196 mmap : 1, /* include mmap data */
197 comm : 1, /* include comm data */
198 freq : 1, /* use freq, not period */
199 inherit_stat : 1, /* per task counts */
200 enable_on_exec : 1, /* next exec enables */
201 task : 1, /* trace fork/exit */
202 watermark : 1, /* wakeup_watermark */
203
204 __reserved_1 : 49;
205
206 union {
207 __u32 wakeup_events; /* wakeup every n events */
208 __u32 wakeup_watermark; /* bytes before wakeup */
209 };
210 __u32 __reserved_2;
211
212 __u64 __reserved_3;
213 };
214
215 /*
216 * Ioctls that can be done on a perf counter fd:
217 */
218 #define PERF_COUNTER_IOC_ENABLE _IO ('$', 0)
219 #define PERF_COUNTER_IOC_DISABLE _IO ('$', 1)
220 #define PERF_COUNTER_IOC_REFRESH _IO ('$', 2)
221 #define PERF_COUNTER_IOC_RESET _IO ('$', 3)
222 #define PERF_COUNTER_IOC_PERIOD _IOW('$', 4, u64)
223 #define PERF_COUNTER_IOC_SET_OUTPUT _IO ('$', 5)
224
225 enum perf_counter_ioc_flags {
226 PERF_IOC_FLAG_GROUP = 1U << 0,
227 };
228
229 /*
230 * Structure of the page that can be mapped via mmap
231 */
232 struct perf_counter_mmap_page {
233 __u32 version; /* version number of this structure */
234 __u32 compat_version; /* lowest version this is compat with */
235
236 /*
237 * Bits needed to read the hw counters in user-space.
238 *
239 * u32 seq;
240 * s64 count;
241 *
242 * do {
243 * seq = pc->lock;
244 *
245 * barrier()
246 * if (pc->index) {
247 * count = pmc_read(pc->index - 1);
248 * count += pc->offset;
249 * } else
250 * goto regular_read;
251 *
252 * barrier();
253 * } while (pc->lock != seq);
254 *
255 * NOTE: for obvious reason this only works on self-monitoring
256 * processes.
257 */
258 __u32 lock; /* seqlock for synchronization */
259 __u32 index; /* hardware counter identifier */
260 __s64 offset; /* add to hardware counter value */
261 __u64 time_enabled; /* time counter active */
262 __u64 time_running; /* time counter on cpu */
263
264 /*
265 * Hole for extension of the self monitor capabilities
266 */
267
268 __u64 __reserved[123]; /* align to 1k */
269
270 /*
271 * Control data for the mmap() data buffer.
272 *
273 * User-space reading the @data_head value should issue an rmb(), on
274 * SMP capable platforms, after reading this value -- see
275 * perf_counter_wakeup().
276 *
277 * When the mapping is PROT_WRITE the @data_tail value should be
278 * written by userspace to reflect the last read data. In this case
279 * the kernel will not over-write unread data.
280 */
281 __u64 data_head; /* head in the data section */
282 __u64 data_tail; /* user-space written tail */
283 };
284
285 #define PERF_EVENT_MISC_CPUMODE_MASK (3 << 0)
286 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN (0 << 0)
287 #define PERF_EVENT_MISC_KERNEL (1 << 0)
288 #define PERF_EVENT_MISC_USER (2 << 0)
289 #define PERF_EVENT_MISC_HYPERVISOR (3 << 0)
290
291 struct perf_event_header {
292 __u32 type;
293 __u16 misc;
294 __u16 size;
295 };
296
297 enum perf_event_type {
298
299 /*
300 * The MMAP events record the PROT_EXEC mappings so that we can
301 * correlate userspace IPs to code. They have the following structure:
302 *
303 * struct {
304 * struct perf_event_header header;
305 *
306 * u32 pid, tid;
307 * u64 addr;
308 * u64 len;
309 * u64 pgoff;
310 * char filename[];
311 * };
312 */
313 PERF_EVENT_MMAP = 1,
314
315 /*
316 * struct {
317 * struct perf_event_header header;
318 * u64 id;
319 * u64 lost;
320 * };
321 */
322 PERF_EVENT_LOST = 2,
323
324 /*
325 * struct {
326 * struct perf_event_header header;
327 *
328 * u32 pid, tid;
329 * char comm[];
330 * };
331 */
332 PERF_EVENT_COMM = 3,
333
334 /*
335 * struct {
336 * struct perf_event_header header;
337 * u32 pid, ppid;
338 * u32 tid, ptid;
339 * };
340 */
341 PERF_EVENT_EXIT = 4,
342
343 /*
344 * struct {
345 * struct perf_event_header header;
346 * u64 time;
347 * u64 id;
348 * u64 stream_id;
349 * };
350 */
351 PERF_EVENT_THROTTLE = 5,
352 PERF_EVENT_UNTHROTTLE = 6,
353
354 /*
355 * struct {
356 * struct perf_event_header header;
357 * u32 pid, ppid;
358 * u32 tid, ptid;
359 * };
360 */
361 PERF_EVENT_FORK = 7,
362
363 /*
364 * struct {
365 * struct perf_event_header header;
366 * u32 pid, tid;
367 *
368 * struct read_format values;
369 * };
370 */
371 PERF_EVENT_READ = 8,
372
373 /*
374 * struct {
375 * struct perf_event_header header;
376 *
377 * { u64 ip; } && PERF_SAMPLE_IP
378 * { u32 pid, tid; } && PERF_SAMPLE_TID
379 * { u64 time; } && PERF_SAMPLE_TIME
380 * { u64 addr; } && PERF_SAMPLE_ADDR
381 * { u64 id; } && PERF_SAMPLE_ID
382 * { u64 stream_id;} && PERF_SAMPLE_STREAM_ID
383 * { u32 cpu, res; } && PERF_SAMPLE_CPU
384 * { u64 period; } && PERF_SAMPLE_PERIOD
385 *
386 * { struct read_format values; } && PERF_SAMPLE_READ
387 *
388 * { u64 nr,
389 * u64 ips[nr]; } && PERF_SAMPLE_CALLCHAIN
390 *
391 * #
392 * # The RAW record below is opaque data wrt the ABI
393 * #
394 * # That is, the ABI doesn't make any promises wrt to
395 * # the stability of its content, it may vary depending
396 * # on event, hardware, kernel version and phase of
397 * # the moon.
398 * #
399 * # In other words, PERF_SAMPLE_RAW contents are not an ABI.
400 * #
401 *
402 * { u32 size;
403 * char data[size];}&& PERF_SAMPLE_RAW
404 * };
405 */
406 PERF_EVENT_SAMPLE = 9,
407
408 PERF_EVENT_MAX, /* non-ABI */
409 };
410
411 enum perf_callchain_context {
412 PERF_CONTEXT_HV = (__u64)-32,
413 PERF_CONTEXT_KERNEL = (__u64)-128,
414 PERF_CONTEXT_USER = (__u64)-512,
415
416 PERF_CONTEXT_GUEST = (__u64)-2048,
417 PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176,
418 PERF_CONTEXT_GUEST_USER = (__u64)-2560,
419
420 PERF_CONTEXT_MAX = (__u64)-4095,
421 };
422
423 #define PERF_FLAG_FD_NO_GROUP (1U << 0)
424 #define PERF_FLAG_FD_OUTPUT (1U << 1)
425
426 #ifdef __KERNEL__
427 /*
428 * Kernel-internal data types and definitions:
429 */
430
431 #ifdef CONFIG_PERF_COUNTERS
432 # include <asm/perf_counter.h>
433 #endif
434
435 #include <linux/list.h>
436 #include <linux/mutex.h>
437 #include <linux/rculist.h>
438 #include <linux/rcupdate.h>
439 #include <linux/spinlock.h>
440 #include <linux/hrtimer.h>
441 #include <linux/fs.h>
442 #include <linux/pid_namespace.h>
443 #include <asm/atomic.h>
444
445 #define PERF_MAX_STACK_DEPTH 255
446
447 struct perf_callchain_entry {
448 __u64 nr;
449 __u64 ip[PERF_MAX_STACK_DEPTH];
450 };
451
452 struct perf_raw_record {
453 u32 size;
454 void *data;
455 };
456
457 struct task_struct;
458
459 /**
460 * struct hw_perf_counter - performance counter hardware details:
461 */
462 struct hw_perf_counter {
463 #ifdef CONFIG_PERF_COUNTERS
464 union {
465 struct { /* hardware */
466 u64 config;
467 unsigned long config_base;
468 unsigned long counter_base;
469 int idx;
470 };
471 union { /* software */
472 atomic64_t count;
473 struct hrtimer hrtimer;
474 };
475 };
476 atomic64_t prev_count;
477 u64 sample_period;
478 u64 last_period;
479 atomic64_t period_left;
480 u64 interrupts;
481
482 u64 freq_count;
483 u64 freq_interrupts;
484 u64 freq_stamp;
485 #endif
486 };
487
488 struct perf_counter;
489
490 /**
491 * struct pmu - generic performance monitoring unit
492 */
493 struct pmu {
494 int (*enable) (struct perf_counter *counter);
495 void (*disable) (struct perf_counter *counter);
496 void (*read) (struct perf_counter *counter);
497 void (*unthrottle) (struct perf_counter *counter);
498 };
499
500 /**
501 * enum perf_counter_active_state - the states of a counter
502 */
503 enum perf_counter_active_state {
504 PERF_COUNTER_STATE_ERROR = -2,
505 PERF_COUNTER_STATE_OFF = -1,
506 PERF_COUNTER_STATE_INACTIVE = 0,
507 PERF_COUNTER_STATE_ACTIVE = 1,
508 };
509
510 struct file;
511
512 struct perf_mmap_data {
513 struct rcu_head rcu_head;
514 int nr_pages; /* nr of data pages */
515 int writable; /* are we writable */
516 int nr_locked; /* nr pages mlocked */
517
518 atomic_t poll; /* POLL_ for wakeups */
519 atomic_t events; /* event limit */
520
521 atomic_long_t head; /* write position */
522 atomic_long_t done_head; /* completed head */
523
524 atomic_t lock; /* concurrent writes */
525 atomic_t wakeup; /* needs a wakeup */
526 atomic_t lost; /* nr records lost */
527
528 long watermark; /* wakeup watermark */
529
530 struct perf_counter_mmap_page *user_page;
531 void *data_pages[0];
532 };
533
534 struct perf_pending_entry {
535 struct perf_pending_entry *next;
536 void (*func)(struct perf_pending_entry *);
537 };
538
539 /**
540 * struct perf_counter - performance counter kernel representation:
541 */
542 struct perf_counter {
543 #ifdef CONFIG_PERF_COUNTERS
544 struct list_head list_entry;
545 struct list_head event_entry;
546 struct list_head sibling_list;
547 int nr_siblings;
548 struct perf_counter *group_leader;
549 struct perf_counter *output;
550 const struct pmu *pmu;
551
552 enum perf_counter_active_state state;
553 atomic64_t count;
554
555 /*
556 * These are the total time in nanoseconds that the counter
557 * has been enabled (i.e. eligible to run, and the task has
558 * been scheduled in, if this is a per-task counter)
559 * and running (scheduled onto the CPU), respectively.
560 *
561 * They are computed from tstamp_enabled, tstamp_running and
562 * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
563 */
564 u64 total_time_enabled;
565 u64 total_time_running;
566
567 /*
568 * These are timestamps used for computing total_time_enabled
569 * and total_time_running when the counter is in INACTIVE or
570 * ACTIVE state, measured in nanoseconds from an arbitrary point
571 * in time.
572 * tstamp_enabled: the notional time when the counter was enabled
573 * tstamp_running: the notional time when the counter was scheduled on
574 * tstamp_stopped: in INACTIVE state, the notional time when the
575 * counter was scheduled off.
576 */
577 u64 tstamp_enabled;
578 u64 tstamp_running;
579 u64 tstamp_stopped;
580
581 struct perf_counter_attr attr;
582 struct hw_perf_counter hw;
583
584 struct perf_counter_context *ctx;
585 struct file *filp;
586
587 /*
588 * These accumulate total time (in nanoseconds) that children
589 * counters have been enabled and running, respectively.
590 */
591 atomic64_t child_total_time_enabled;
592 atomic64_t child_total_time_running;
593
594 /*
595 * Protect attach/detach and child_list:
596 */
597 struct mutex child_mutex;
598 struct list_head child_list;
599 struct perf_counter *parent;
600
601 int oncpu;
602 int cpu;
603
604 struct list_head owner_entry;
605 struct task_struct *owner;
606
607 /* mmap bits */
608 struct mutex mmap_mutex;
609 atomic_t mmap_count;
610 struct perf_mmap_data *data;
611
612 /* poll related */
613 wait_queue_head_t waitq;
614 struct fasync_struct *fasync;
615
616 /* delayed work for NMIs and such */
617 int pending_wakeup;
618 int pending_kill;
619 int pending_disable;
620 struct perf_pending_entry pending;
621
622 atomic_t event_limit;
623
624 void (*destroy)(struct perf_counter *);
625 struct rcu_head rcu_head;
626
627 struct pid_namespace *ns;
628 u64 id;
629 #endif
630 };
631
632 /**
633 * struct perf_counter_context - counter context structure
634 *
635 * Used as a container for task counters and CPU counters as well:
636 */
637 struct perf_counter_context {
638 /*
639 * Protect the states of the counters in the list,
640 * nr_active, and the list:
641 */
642 spinlock_t lock;
643 /*
644 * Protect the list of counters. Locking either mutex or lock
645 * is sufficient to ensure the list doesn't change; to change
646 * the list you need to lock both the mutex and the spinlock.
647 */
648 struct mutex mutex;
649
650 struct list_head counter_list;
651 struct list_head event_list;
652 int nr_counters;
653 int nr_active;
654 int is_active;
655 int nr_stat;
656 atomic_t refcount;
657 struct task_struct *task;
658
659 /*
660 * Context clock, runs when context enabled.
661 */
662 u64 time;
663 u64 timestamp;
664
665 /*
666 * These fields let us detect when two contexts have both
667 * been cloned (inherited) from a common ancestor.
668 */
669 struct perf_counter_context *parent_ctx;
670 u64 parent_gen;
671 u64 generation;
672 int pin_count;
673 struct rcu_head rcu_head;
674 };
675
676 /**
677 * struct perf_counter_cpu_context - per cpu counter context structure
678 */
679 struct perf_cpu_context {
680 struct perf_counter_context ctx;
681 struct perf_counter_context *task_ctx;
682 int active_oncpu;
683 int max_pertask;
684 int exclusive;
685
686 /*
687 * Recursion avoidance:
688 *
689 * task, softirq, irq, nmi context
690 */
691 int recursion[4];
692 };
693
694 #ifdef CONFIG_PERF_COUNTERS
695
696 /*
697 * Set by architecture code:
698 */
699 extern int perf_max_counters;
700
701 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
702
703 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
704 extern void perf_counter_task_sched_out(struct task_struct *task,
705 struct task_struct *next, int cpu);
706 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
707 extern int perf_counter_init_task(struct task_struct *child);
708 extern void perf_counter_exit_task(struct task_struct *child);
709 extern void perf_counter_free_task(struct task_struct *task);
710 extern void set_perf_counter_pending(void);
711 extern void perf_counter_do_pending(void);
712 extern void perf_counter_print_debug(void);
713 extern void __perf_disable(void);
714 extern bool __perf_enable(void);
715 extern void perf_disable(void);
716 extern void perf_enable(void);
717 extern int perf_counter_task_disable(void);
718 extern int perf_counter_task_enable(void);
719 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
720 struct perf_cpu_context *cpuctx,
721 struct perf_counter_context *ctx, int cpu);
722 extern void perf_counter_update_userpage(struct perf_counter *counter);
723
724 struct perf_sample_data {
725 struct pt_regs *regs;
726 u64 addr;
727 u64 period;
728 struct perf_raw_record *raw;
729 };
730
731 extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
732 struct perf_sample_data *data);
733 extern void perf_counter_output(struct perf_counter *counter, int nmi,
734 struct perf_sample_data *data);
735
736 /*
737 * Return 1 for a software counter, 0 for a hardware counter
738 */
739 static inline int is_software_counter(struct perf_counter *counter)
740 {
741 return (counter->attr.type != PERF_TYPE_RAW) &&
742 (counter->attr.type != PERF_TYPE_HARDWARE) &&
743 (counter->attr.type != PERF_TYPE_HW_CACHE);
744 }
745
746 extern atomic_t perf_swcounter_enabled[PERF_COUNT_SW_MAX];
747
748 extern void __perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
749
750 static inline void
751 perf_swcounter_event(u32 event, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
752 {
753 if (atomic_read(&perf_swcounter_enabled[event]))
754 __perf_swcounter_event(event, nr, nmi, regs, addr);
755 }
756
757 extern void __perf_counter_mmap(struct vm_area_struct *vma);
758
759 static inline void perf_counter_mmap(struct vm_area_struct *vma)
760 {
761 if (vma->vm_flags & VM_EXEC)
762 __perf_counter_mmap(vma);
763 }
764
765 extern void perf_counter_comm(struct task_struct *tsk);
766 extern void perf_counter_fork(struct task_struct *tsk);
767
768 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
769
770 extern int sysctl_perf_counter_paranoid;
771 extern int sysctl_perf_counter_mlock;
772 extern int sysctl_perf_counter_sample_rate;
773
774 extern void perf_counter_init(void);
775 extern void perf_tpcounter_event(int event_id, u64 addr, u64 count,
776 void *record, int entry_size);
777
778 #ifndef perf_misc_flags
779 #define perf_misc_flags(regs) (user_mode(regs) ? PERF_EVENT_MISC_USER : \
780 PERF_EVENT_MISC_KERNEL)
781 #define perf_instruction_pointer(regs) instruction_pointer(regs)
782 #endif
783
784 #else
785 static inline void
786 perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
787 static inline void
788 perf_counter_task_sched_out(struct task_struct *task,
789 struct task_struct *next, int cpu) { }
790 static inline void
791 perf_counter_task_tick(struct task_struct *task, int cpu) { }
792 static inline int perf_counter_init_task(struct task_struct *child) { return 0; }
793 static inline void perf_counter_exit_task(struct task_struct *child) { }
794 static inline void perf_counter_free_task(struct task_struct *task) { }
795 static inline void perf_counter_do_pending(void) { }
796 static inline void perf_counter_print_debug(void) { }
797 static inline void perf_disable(void) { }
798 static inline void perf_enable(void) { }
799 static inline int perf_counter_task_disable(void) { return -EINVAL; }
800 static inline int perf_counter_task_enable(void) { return -EINVAL; }
801
802 static inline void
803 perf_swcounter_event(u32 event, u64 nr, int nmi,
804 struct pt_regs *regs, u64 addr) { }
805
806 static inline void perf_counter_mmap(struct vm_area_struct *vma) { }
807 static inline void perf_counter_comm(struct task_struct *tsk) { }
808 static inline void perf_counter_fork(struct task_struct *tsk) { }
809 static inline void perf_counter_init(void) { }
810 #endif
811
812 #endif /* __KERNEL__ */
813 #endif /* _LINUX_PERF_COUNTER_H */
kernel-based virtual machine