include/linux/perf_counter.h

   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_GROUP                       = 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 };
 124
 125 /*
 126  * Bits that can be set in attr.read_format to request that
 127  * reads on the counter should return the indicated quantities,
 128  * in increasing order of bit value, after the counter value.
 129  */
 130 enum perf_counter_read_format {
 131         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 132         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 133         PERF_FORMAT_ID                          = 1U << 2,
 134 };
 135
 136 /*
 137  * Hardware event to monitor via a performance monitoring counter:
 138  */
 139 struct perf_counter_attr {
 140         /*
 141          * Major type: hardware/software/tracepoint/etc.
 142          */
 143         __u32                   type;
 144         __u32                   __reserved_1;
 145
 146         /*
 147          * Type specific configuration information.
 148          */
 149         __u64                   config;
 150
 151         union {
 152                 __u64           sample_period;
 153                 __u64           sample_freq;
 154         };
 155
 156         __u64                   sample_type;
 157         __u64                   read_format;
 158
 159         __u64                   disabled       :  1, /* off by default        */
 160                                 inherit        :  1, /* children inherit it   */
 161                                 pinned         :  1, /* must always be on PMU */
 162                                 exclusive      :  1, /* only group on PMU     */
 163                                 exclude_user   :  1, /* don't count user      */
 164                                 exclude_kernel :  1, /* ditto kernel          */
 165                                 exclude_hv     :  1, /* ditto hypervisor      */
 166                                 exclude_idle   :  1, /* don't count when idle */
 167                                 mmap           :  1, /* include mmap data     */
 168                                 comm           :  1, /* include comm data     */
 169                                 freq           :  1, /* use freq, not period  */
 170
 171                                 __reserved_2   : 53;
 172
 173         __u32                   wakeup_events;  /* wakeup every n events */
 174         __u32                   __reserved_3;
 175
 176         __u64                   __reserved_4;
 177 };
 178
 179 /*
 180  * Ioctls that can be done on a perf counter fd:
 181  */
 182 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 183 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 184 #define PERF_COUNTER_IOC_REFRESH        _IO ('$', 2)
 185 #define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 186 #define PERF_COUNTER_IOC_PERIOD         _IOW('$', 4, u64)
 187
 188 enum perf_counter_ioc_flags {
 189         PERF_IOC_FLAG_GROUP             = 1U << 0,
 190 };
 191
 192 /*
 193  * Structure of the page that can be mapped via mmap
 194  */
 195 struct perf_counter_mmap_page {
 196         __u32   version;                /* version number of this structure */
 197         __u32   compat_version;         /* lowest version this is compat with */
 198
 199         /*
 200          * Bits needed to read the hw counters in user-space.
 201          *
 202          *   u32 seq;
 203          *   s64 count;
 204          *
 205          *   do {
 206          *     seq = pc->lock;
 207          *
 208          *     barrier()
 209          *     if (pc->index) {
 210          *       count = pmc_read(pc->index - 1);
 211          *       count += pc->offset;
 212          *     } else
 213          *       goto regular_read;
 214          *
 215          *     barrier();
 216          *   } while (pc->lock != seq);
 217          *
 218          * NOTE: for obvious reason this only works on self-monitoring
 219          *       processes.
 220          */
 221         __u32   lock;                   /* seqlock for synchronization */
 222         __u32   index;                  /* hardware counter identifier */
 223         __s64   offset;                 /* add to hardware counter value */
 224
 225         /*
 226          * Control data for the mmap() data buffer.
 227          *
 228          * User-space reading this value should issue an rmb(), on SMP capable
 229          * platforms, after reading this value -- see perf_counter_wakeup().
 230          */
 231         __u64   data_head;              /* head in the data section */
 232 };
 233
 234 #define PERF_EVENT_MISC_CPUMODE_MASK            (3 << 0)
 235 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN         (0 << 0)
 236 #define PERF_EVENT_MISC_KERNEL                  (1 << 0)
 237 #define PERF_EVENT_MISC_USER                    (2 << 0)
 238 #define PERF_EVENT_MISC_HYPERVISOR              (3 << 0)
 239 #define PERF_EVENT_MISC_OVERFLOW                (1 << 2)
 240
 241 struct perf_event_header {
 242         __u32   type;
 243         __u16   misc;
 244         __u16   size;
 245 };
 246
 247 enum perf_event_type {
 248
 249         /*
 250          * The MMAP events record the PROT_EXEC mappings so that we can
 251          * correlate userspace IPs to code. They have the following structure:
 252          *
 253          * struct {
 254          *      struct perf_event_header        header;
 255          *
 256          *      u32                             pid, tid;
 257          *      u64                             addr;
 258          *      u64                             len;
 259          *      u64                             pgoff;
 260          *      char                            filename[];
 261          * };
 262          */
 263         PERF_EVENT_MMAP                 = 1,
 264
 265         /*
 266          * struct {
 267          *      struct perf_event_header        header;
 268          *
 269          *      u32                             pid, tid;
 270          *      char                            comm[];
 271          * };
 272          */
 273         PERF_EVENT_COMM                 = 3,
 274
 275         /*
 276          * struct {
 277          *      struct perf_event_header        header;
 278          *      u64                             time;
 279          *      u64                             id;
 280          *      u64                             sample_period;
 281          * };
 282          */
 283         PERF_EVENT_PERIOD               = 4,
 284
 285         /*
 286          * struct {
 287          *      struct perf_event_header        header;
 288          *      u64                             time;
 289          * };
 290          */
 291         PERF_EVENT_THROTTLE             = 5,
 292         PERF_EVENT_UNTHROTTLE           = 6,
 293
 294         /*
 295          * struct {
 296          *      struct perf_event_header        header;
 297          *      u32                             pid, ppid;
 298          * };
 299          */
 300         PERF_EVENT_FORK                 = 7,
 301
 302         /*
 303          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
 304          * will be PERF_RECORD_*
 305          *
 306          * struct {
 307          *      struct perf_event_header        header;
 308          *
 309          *      { u64                   ip;       } && PERF_RECORD_IP
 310          *      { u32                   pid, tid; } && PERF_RECORD_TID
 311          *      { u64                   time;     } && PERF_RECORD_TIME
 312          *      { u64                   addr;     } && PERF_RECORD_ADDR
 313          *      { u64                   config;   } && PERF_RECORD_CONFIG
 314          *      { u32                   cpu, res; } && PERF_RECORD_CPU
 315          *
 316          *      { u64                   nr;
 317          *        { u64 id, val; }      cnt[nr];  } && PERF_RECORD_GROUP
 318          *
 319          *      { u16                   nr,
 320          *                              hv,
 321          *                              kernel,
 322          *                              user;
 323          *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
 324          * };
 325          */
 326 };
 327
 328 #ifdef __KERNEL__
 329 /*
 330  * Kernel-internal data types and definitions:
 331  */
 332
 333 #ifdef CONFIG_PERF_COUNTERS
 334 # include <asm/perf_counter.h>
 335 #endif
 336
 337 #include <linux/list.h>
 338 #include <linux/mutex.h>
 339 #include <linux/rculist.h>
 340 #include <linux/rcupdate.h>
 341 #include <linux/spinlock.h>
 342 #include <linux/hrtimer.h>
 343 #include <linux/fs.h>
 344 #include <linux/pid_namespace.h>
 345 #include <asm/atomic.h>
 346
 347 struct task_struct;
 348
 349 /**
 350  * struct hw_perf_counter - performance counter hardware details:
 351  */
 352 struct hw_perf_counter {
 353 #ifdef CONFIG_PERF_COUNTERS
 354         union {
 355                 struct { /* hardware */
 356                         u64             config;
 357                         unsigned long   config_base;
 358                         unsigned long   counter_base;
 359                         int             idx;
 360                 };
 361                 union { /* software */
 362                         atomic64_t      count;
 363                         struct hrtimer  hrtimer;
 364                 };
 365         };
 366         atomic64_t                      prev_count;
 367         u64                             sample_period;
 368         u64                             last_period;
 369         atomic64_t                      period_left;
 370         u64                             interrupts;
 371
 372         u64                             freq_count;
 373         u64                             freq_interrupts;
 374         u64                             freq_stamp;
 375 #endif
 376 };
 377
 378 struct perf_counter;
 379
 380 /**
 381  * struct pmu - generic performance monitoring unit
 382  */
 383 struct pmu {
 384         int (*enable)                   (struct perf_counter *counter);
 385         void (*disable)                 (struct perf_counter *counter);
 386         void (*read)                    (struct perf_counter *counter);
 387         void (*unthrottle)              (struct perf_counter *counter);
 388 };
 389
 390 /**
 391  * enum perf_counter_active_state - the states of a counter
 392  */
 393 enum perf_counter_active_state {
 394         PERF_COUNTER_STATE_ERROR        = -2,
 395         PERF_COUNTER_STATE_OFF          = -1,
 396         PERF_COUNTER_STATE_INACTIVE     =  0,
 397         PERF_COUNTER_STATE_ACTIVE       =  1,
 398 };
 399
 400 struct file;
 401
 402 struct perf_mmap_data {
 403         struct rcu_head                 rcu_head;
 404         int                             nr_pages;       /* nr of data pages  */
 405         int                             nr_locked;      /* nr pages mlocked  */
 406
 407         atomic_t                        poll;           /* POLL_ for wakeups */
 408         atomic_t                        events;         /* event limit       */
 409
 410         atomic_long_t                   head;           /* write position    */
 411         atomic_long_t                   done_head;      /* completed head    */
 412
 413         atomic_t                        lock;           /* concurrent writes */
 414
 415         atomic_t                        wakeup;         /* needs a wakeup    */
 416
 417         struct perf_counter_mmap_page   *user_page;
 418         void                            *data_pages[0];
 419 };
 420
 421 struct perf_pending_entry {
 422         struct perf_pending_entry *next;
 423         void (*func)(struct perf_pending_entry *);
 424 };
 425
 426 /**
 427  * struct perf_counter - performance counter kernel representation:
 428  */
 429 struct perf_counter {
 430 #ifdef CONFIG_PERF_COUNTERS
 431         struct list_head                list_entry;
 432         struct list_head                event_entry;
 433         struct list_head                sibling_list;
 434         int                             nr_siblings;
 435         struct perf_counter             *group_leader;
 436         const struct pmu                *pmu;
 437
 438         enum perf_counter_active_state  state;
 439         atomic64_t                      count;
 440
 441         /*
 442          * These are the total time in nanoseconds that the counter
 443          * has been enabled (i.e. eligible to run, and the task has
 444          * been scheduled in, if this is a per-task counter)
 445          * and running (scheduled onto the CPU), respectively.
 446          *
 447          * They are computed from tstamp_enabled, tstamp_running and
 448          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 449          */
 450         u64                             total_time_enabled;
 451         u64                             total_time_running;
 452
 453         /*
 454          * These are timestamps used for computing total_time_enabled
 455          * and total_time_running when the counter is in INACTIVE or
 456          * ACTIVE state, measured in nanoseconds from an arbitrary point
 457          * in time.
 458          * tstamp_enabled: the notional time when the counter was enabled
 459          * tstamp_running: the notional time when the counter was scheduled on
 460          * tstamp_stopped: in INACTIVE state, the notional time when the
 461          *      counter was scheduled off.
 462          */
 463         u64                             tstamp_enabled;
 464         u64                             tstamp_running;
 465         u64                             tstamp_stopped;
 466
 467         struct perf_counter_attr        attr;
 468         struct hw_perf_counter          hw;
 469
 470         struct perf_counter_context     *ctx;
 471         struct file                     *filp;
 472
 473         /*
 474          * These accumulate total time (in nanoseconds) that children
 475          * counters have been enabled and running, respectively.
 476          */
 477         atomic64_t                      child_total_time_enabled;
 478         atomic64_t                      child_total_time_running;
 479
 480         /*
 481          * Protect attach/detach and child_list:
 482          */
 483         struct mutex                    child_mutex;
 484         struct list_head                child_list;
 485         struct perf_counter             *parent;
 486
 487         int                             oncpu;
 488         int                             cpu;
 489
 490         struct list_head                owner_entry;
 491         struct task_struct              *owner;
 492
 493         /* mmap bits */
 494         struct mutex                    mmap_mutex;
 495         atomic_t                        mmap_count;
 496         struct perf_mmap_data           *data;
 497
 498         /* poll related */
 499         wait_queue_head_t               waitq;
 500         struct fasync_struct            *fasync;
 501
 502         /* delayed work for NMIs and such */
 503         int                             pending_wakeup;
 504         int                             pending_kill;
 505         int                             pending_disable;
 506         struct perf_pending_entry       pending;
 507
 508         atomic_t                        event_limit;
 509
 510         void (*destroy)(struct perf_counter *);
 511         struct rcu_head                 rcu_head;
 512
 513         struct pid_namespace            *ns;
 514         u64                             id;
 515 #endif
 516 };
 517
 518 /**
 519  * struct perf_counter_context - counter context structure
 520  *
 521  * Used as a container for task counters and CPU counters as well:
 522  */
 523 struct perf_counter_context {
 524         /*
 525          * Protect the states of the counters in the list,
 526          * nr_active, and the list:
 527          */
 528         spinlock_t                      lock;
 529         /*
 530          * Protect the list of counters.  Locking either mutex or lock
 531          * is sufficient to ensure the list doesn't change; to change
 532          * the list you need to lock both the mutex and the spinlock.
 533          */
 534         struct mutex                    mutex;
 535
 536         struct list_head                counter_list;
 537         struct list_head                event_list;
 538         int                             nr_counters;
 539         int                             nr_active;
 540         int                             is_active;
 541         atomic_t                        refcount;
 542         struct task_struct              *task;
 543
 544         /*
 545          * Context clock, runs when context enabled.
 546          */
 547         u64                             time;
 548         u64                             timestamp;
 549
 550         /*
 551          * These fields let us detect when two contexts have both
 552          * been cloned (inherited) from a common ancestor.
 553          */
 554         struct perf_counter_context     *parent_ctx;
 555         u64                             parent_gen;
 556         u64                             generation;
 557         int                             pin_count;
 558         struct rcu_head                 rcu_head;
 559 };
 560
 561 /**
 562  * struct perf_counter_cpu_context - per cpu counter context structure
 563  */
 564 struct perf_cpu_context {
 565         struct perf_counter_context     ctx;
 566         struct perf_counter_context     *task_ctx;
 567         int                             active_oncpu;
 568         int                             max_pertask;
 569         int                             exclusive;
 570
 571         /*
 572          * Recursion avoidance:
 573          *
 574          * task, softirq, irq, nmi context
 575          */
 576         int                             recursion[4];
 577 };
 578
 579 #ifdef CONFIG_PERF_COUNTERS
 580
 581 /*
 582  * Set by architecture code:
 583  */
 584 extern int perf_max_counters;
 585
 586 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 587
 588 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 589 extern void perf_counter_task_sched_out(struct task_struct *task,
 590                                         struct task_struct *next, int cpu);
 591 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 592 extern int perf_counter_init_task(struct task_struct *child);
 593 extern void perf_counter_exit_task(struct task_struct *child);
 594 extern void perf_counter_free_task(struct task_struct *task);
 595 extern void perf_counter_do_pending(void);
 596 extern void perf_counter_print_debug(void);
 597 extern void __perf_disable(void);
 598 extern bool __perf_enable(void);
 599 extern void perf_disable(void);
 600 extern void perf_enable(void);
 601 extern int perf_counter_task_disable(void);
 602 extern int perf_counter_task_enable(void);
 603 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 604                struct perf_cpu_context *cpuctx,
 605                struct perf_counter_context *ctx, int cpu);
 606 extern void perf_counter_update_userpage(struct perf_counter *counter);
 607
 608 struct perf_sample_data {
 609         struct pt_regs                  *regs;
 610         u64                             addr;
 611         u64                             period;
 612 };
 613
 614 extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
 615                                  struct perf_sample_data *data);
 616
 617 /*
 618  * Return 1 for a software counter, 0 for a hardware counter
 619  */
 620 static inline int is_software_counter(struct perf_counter *counter)
 621 {
 622         return (counter->attr.type != PERF_TYPE_RAW) &&
 623                 (counter->attr.type != PERF_TYPE_HARDWARE);
 624 }
 625
 626 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 627
 628 extern void __perf_counter_mmap(struct vm_area_struct *vma);
 629
 630 static inline void perf_counter_mmap(struct vm_area_struct *vma)
 631 {
 632         if (vma->vm_flags & VM_EXEC)
 633                 __perf_counter_mmap(vma);
 634 }
 635
 636 extern void perf_counter_comm(struct task_struct *tsk);
 637 extern void perf_counter_fork(struct task_struct *tsk);
 638
 639 extern void perf_counter_task_migration(struct task_struct *task, int cpu);
 640
 641 #define MAX_STACK_DEPTH                 255
 642
 643 struct perf_callchain_entry {
 644         u16                             nr;
 645         u16                             hv;
 646         u16                             kernel;
 647         u16                             user;
 648         u64                             ip[MAX_STACK_DEPTH];
 649 };
 650
 651 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 652
 653 extern int sysctl_perf_counter_paranoid;
 654 extern int sysctl_perf_counter_mlock;
 655 extern int sysctl_perf_counter_sample_rate;
 656
 657 extern void perf_counter_init(void);
 658
 659 #ifndef perf_misc_flags
 660 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_EVENT_MISC_USER : \
 661                                  PERF_EVENT_MISC_KERNEL)
 662 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 663 #endif
 664
 665 #else
 666 static inline void
 667 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 668 static inline void
 669 perf_counter_task_sched_out(struct task_struct *task,
 670                             struct task_struct *next, int cpu)          { }
 671 static inline void
 672 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 673 static inline int perf_counter_init_task(struct task_struct *child)     { return 0; }
 674 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 675 static inline void perf_counter_free_task(struct task_struct *task)     { }
 676 static inline void perf_counter_do_pending(void)                        { }
 677 static inline void perf_counter_print_debug(void)                       { }
 678 static inline void perf_disable(void)                                   { }
 679 static inline void perf_enable(void)                                    { }
 680 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 681 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 682
 683 static inline void
 684 perf_swcounter_event(u32 event, u64 nr, int nmi,
 685                      struct pt_regs *regs, u64 addr)                    { }
 686
 687 static inline void perf_counter_mmap(struct vm_area_struct *vma)        { }
 688 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 689 static inline void perf_counter_fork(struct task_struct *tsk)           { }
 690 static inline void perf_counter_init(void)                              { }
 691 static inline void perf_counter_task_migration(struct task_struct *task,
 692                                                int cpu)                 { }
 693 #endif
 694
 695 #endif /* __KERNEL__ */
 696 #endif /* _LINUX_PERF_COUNTER_H */