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   1 /*
   2  *  Performance counters:
   3  *
   4  *   Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
   5  *   Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
   6  *
   7  *  Data type definitions, declarations, prototypes.
   8  *
   9  *  Started by: Thomas Gleixner and Ingo Molnar
  10  *
  11  *  For licencing details see kernel-base/COPYING
  12  */
  13 #ifndef _LINUX_PERF_COUNTER_H
  14 #define _LINUX_PERF_COUNTER_H
  15
  16 #include <linux/types.h>
  17 #include <linux/ioctl.h>
  18 #include <asm/byteorder.h>
  19
  20 /*
  21  * User-space ABI bits:
  22  */
  23
  24 /*
  25  * hw_event.type
  26  */
  27 enum perf_event_types {
  28         PERF_TYPE_HARDWARE              = 0,
  29         PERF_TYPE_SOFTWARE              = 1,
  30         PERF_TYPE_TRACEPOINT            = 2,
  31
  32         /*
  33          * available TYPE space, raw is the max value.
  34          */
  35
  36         PERF_TYPE_RAW                   = 128,
  37 };
  38
  39 /*
  40  * Generalized performance counter event types, used by the hw_event.event_id
  41  * parameter of the sys_perf_counter_open() syscall:
  42  */
  43 enum hw_event_ids {
  44         /*
  45          * Common hardware events, generalized by the kernel:
  46          */
  47         PERF_COUNT_CPU_CYCLES           = 0,
  48         PERF_COUNT_INSTRUCTIONS         = 1,
  49         PERF_COUNT_CACHE_REFERENCES     = 2,
  50         PERF_COUNT_CACHE_MISSES         = 3,
  51         PERF_COUNT_BRANCH_INSTRUCTIONS  = 4,
  52         PERF_COUNT_BRANCH_MISSES        = 5,
  53         PERF_COUNT_BUS_CYCLES           = 6,
  54
  55         PERF_HW_EVENTS_MAX              = 7,
  56 };
  57
  58 /*
  59  * Special "software" counters provided by the kernel, even if the hardware
  60  * does not support performance counters. These counters measure various
  61  * physical and sw events of the kernel (and allow the profiling of them as
  62  * well):
  63  */
  64 enum sw_event_ids {
  65         PERF_COUNT_CPU_CLOCK            = 0,
  66         PERF_COUNT_TASK_CLOCK           = 1,
  67         PERF_COUNT_PAGE_FAULTS          = 2,
  68         PERF_COUNT_CONTEXT_SWITCHES     = 3,
  69         PERF_COUNT_CPU_MIGRATIONS       = 4,
  70         PERF_COUNT_PAGE_FAULTS_MIN      = 5,
  71         PERF_COUNT_PAGE_FAULTS_MAJ      = 6,
  72
  73         PERF_SW_EVENTS_MAX              = 7,
  74 };
  75
  76 #define __PERF_COUNTER_MASK(name)                       \
  77         (((1ULL << PERF_COUNTER_##name##_BITS) - 1) <<  \
  78          PERF_COUNTER_##name##_SHIFT)
  79
  80 #define PERF_COUNTER_RAW_BITS           1
  81 #define PERF_COUNTER_RAW_SHIFT          63
  82 #define PERF_COUNTER_RAW_MASK           __PERF_COUNTER_MASK(RAW)
  83
  84 #define PERF_COUNTER_CONFIG_BITS        63
  85 #define PERF_COUNTER_CONFIG_SHIFT       0
  86 #define PERF_COUNTER_CONFIG_MASK        __PERF_COUNTER_MASK(CONFIG)
  87
  88 #define PERF_COUNTER_TYPE_BITS          7
  89 #define PERF_COUNTER_TYPE_SHIFT         56
  90 #define PERF_COUNTER_TYPE_MASK          __PERF_COUNTER_MASK(TYPE)
  91
  92 #define PERF_COUNTER_EVENT_BITS         56
  93 #define PERF_COUNTER_EVENT_SHIFT        0
  94 #define PERF_COUNTER_EVENT_MASK         __PERF_COUNTER_MASK(EVENT)
  95
  96 /*
  97  * Bits that can be set in hw_event.sample_type to request information
  98  * in the overflow packets.
  99  */
 100 enum perf_counter_sample_format {
 101         PERF_SAMPLE_IP                  = 1U << 0,
 102         PERF_SAMPLE_TID                 = 1U << 1,
 103         PERF_SAMPLE_TIME                = 1U << 2,
 104         PERF_SAMPLE_ADDR                = 1U << 3,
 105         PERF_SAMPLE_GROUP               = 1U << 4,
 106         PERF_SAMPLE_CALLCHAIN           = 1U << 5,
 107         PERF_SAMPLE_CONFIG              = 1U << 6,
 108         PERF_SAMPLE_CPU                 = 1U << 7,
 109 };
 110
 111 /*
 112  * Bits that can be set in hw_event.read_format to request that
 113  * reads on the counter should return the indicated quantities,
 114  * in increasing order of bit value, after the counter value.
 115  */
 116 enum perf_counter_read_format {
 117         PERF_FORMAT_TOTAL_TIME_ENABLED  =  1U << 0,
 118         PERF_FORMAT_TOTAL_TIME_RUNNING  =  1U << 1,
 119         PERF_FORMAT_ID                  =  1U << 2,
 120 };
 121
 122 /*
 123  * Hardware event to monitor via a performance monitoring counter:
 124  */
 125 struct perf_counter_hw_event {
 126         /*
 127          * The MSB of the config word signifies if the rest contains cpu
 128          * specific (raw) counter configuration data, if unset, the next
 129          * 7 bits are an event type and the rest of the bits are the event
 130          * identifier.
 131          */
 132         __u64                   config;
 133
 134         union {
 135                 __u64           sample_period;
 136                 __u64           sample_freq;
 137         };
 138
 139         __u64                   sample_type;
 140         __u64                   read_format;
 141
 142         __u64                   disabled       :  1, /* off by default        */
 143                                 inherit        :  1, /* children inherit it   */
 144                                 pinned         :  1, /* must always be on PMU */
 145                                 exclusive      :  1, /* only group on PMU     */
 146                                 exclude_user   :  1, /* don't count user      */
 147                                 exclude_kernel :  1, /* ditto kernel          */
 148                                 exclude_hv     :  1, /* ditto hypervisor      */
 149                                 exclude_idle   :  1, /* don't count when idle */
 150                                 mmap           :  1, /* include mmap data     */
 151                                 munmap         :  1, /* include munmap data   */
 152                                 comm           :  1, /* include comm data     */
 153                                 freq           :  1, /* use freq, not period  */
 154
 155                                 __reserved_1   : 52;
 156
 157         __u32                   wakeup_events;  /* wakeup every n events */
 158         __u32                   __reserved_2;
 159
 160         __u64                   __reserved_3;
 161         __u64                   __reserved_4;
 162 };
 163
 164 /*
 165  * Ioctls that can be done on a perf counter fd:
 166  */
 167 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 168 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 169 #define PERF_COUNTER_IOC_REFRESH        _IO ('$', 2)
 170 #define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 171 #define PERF_COUNTER_IOC_PERIOD         _IOW('$', 4, u64)
 172
 173 enum perf_counter_ioc_flags {
 174         PERF_IOC_FLAG_GROUP             = 1U << 0,
 175 };
 176
 177 /*
 178  * Structure of the page that can be mapped via mmap
 179  */
 180 struct perf_counter_mmap_page {
 181         __u32   version;                /* version number of this structure */
 182         __u32   compat_version;         /* lowest version this is compat with */
 183
 184         /*
 185          * Bits needed to read the hw counters in user-space.
 186          *
 187          *   u32 seq;
 188          *   s64 count;
 189          *
 190          *   do {
 191          *     seq = pc->lock;
 192          *
 193          *     barrier()
 194          *     if (pc->index) {
 195          *       count = pmc_read(pc->index - 1);
 196          *       count += pc->offset;
 197          *     } else
 198          *       goto regular_read;
 199          *
 200          *     barrier();
 201          *   } while (pc->lock != seq);
 202          *
 203          * NOTE: for obvious reason this only works on self-monitoring
 204          *       processes.
 205          */
 206         __u32   lock;                   /* seqlock for synchronization */
 207         __u32   index;                  /* hardware counter identifier */
 208         __s64   offset;                 /* add to hardware counter value */
 209
 210         /*
 211          * Control data for the mmap() data buffer.
 212          *
 213          * User-space reading this value should issue an rmb(), on SMP capable
 214          * platforms, after reading this value -- see perf_counter_wakeup().
 215          */
 216         __u64   data_head;              /* head in the data section */
 217 };
 218
 219 #define PERF_EVENT_MISC_CPUMODE_MASK    (3 << 0)
 220 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN (0 << 0)
 221 #define PERF_EVENT_MISC_KERNEL          (1 << 0)
 222 #define PERF_EVENT_MISC_USER            (2 << 0)
 223 #define PERF_EVENT_MISC_HYPERVISOR      (3 << 0)
 224 #define PERF_EVENT_MISC_OVERFLOW        (1 << 2)
 225
 226 struct perf_event_header {
 227         __u32   type;
 228         __u16   misc;
 229         __u16   size;
 230 };
 231
 232 enum perf_event_type {
 233
 234         /*
 235          * The MMAP events record the PROT_EXEC mappings so that we can
 236          * correlate userspace IPs to code. They have the following structure:
 237          *
 238          * struct {
 239          *      struct perf_event_header        header;
 240          *
 241          *      u32                             pid, tid;
 242          *      u64                             addr;
 243          *      u64                             len;
 244          *      u64                             pgoff;
 245          *      char                            filename[];
 246          * };
 247          */
 248         PERF_EVENT_MMAP                 = 1,
 249         PERF_EVENT_MUNMAP               = 2,
 250
 251         /*
 252          * struct {
 253          *      struct perf_event_header        header;
 254          *
 255          *      u32                             pid, tid;
 256          *      char                            comm[];
 257          * };
 258          */
 259         PERF_EVENT_COMM                 = 3,
 260
 261         /*
 262          * struct {
 263          *      struct perf_event_header        header;
 264          *      u64                             time;
 265          *      u64                             sample_period;
 266          * };
 267          */
 268         PERF_EVENT_PERIOD               = 4,
 269
 270         /*
 271          * struct {
 272          *      struct perf_event_header        header;
 273          *      u64                             time;
 274          * };
 275          */
 276         PERF_EVENT_THROTTLE             = 5,
 277         PERF_EVENT_UNTHROTTLE           = 6,
 278
 279         /*
 280          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
 281          * will be PERF_RECORD_*
 282          *
 283          * struct {
 284          *      struct perf_event_header        header;
 285          *
 286          *      { u64                   ip;       } && PERF_RECORD_IP
 287          *      { u32                   pid, tid; } && PERF_RECORD_TID
 288          *      { u64                   time;     } && PERF_RECORD_TIME
 289          *      { u64                   addr;     } && PERF_RECORD_ADDR
 290          *      { u64                   config;   } && PERF_RECORD_CONFIG
 291          *      { u32                   cpu, res; } && PERF_RECORD_CPU
 292          *
 293          *      { u64                   nr;
 294          *        { u64 id, val; }      cnt[nr];  } && PERF_RECORD_GROUP
 295          *
 296          *      { u16                   nr,
 297          *                              hv,
 298          *                              kernel,
 299          *                              user;
 300          *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
 301          * };
 302          */
 303 };
 304
 305 #ifdef __KERNEL__
 306 /*
 307  * Kernel-internal data types and definitions:
 308  */
 309
 310 #ifdef CONFIG_PERF_COUNTERS
 311 # include <asm/perf_counter.h>
 312 #endif
 313
 314 #include <linux/list.h>
 315 #include <linux/mutex.h>
 316 #include <linux/rculist.h>
 317 #include <linux/rcupdate.h>
 318 #include <linux/spinlock.h>
 319 #include <linux/hrtimer.h>
 320 #include <linux/fs.h>
 321 #include <linux/pid_namespace.h>
 322 #include <asm/atomic.h>
 323
 324 struct task_struct;
 325
 326 static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
 327 {
 328         return hw_event->config & PERF_COUNTER_RAW_MASK;
 329 }
 330
 331 static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
 332 {
 333         return hw_event->config & PERF_COUNTER_CONFIG_MASK;
 334 }
 335
 336 static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
 337 {
 338         return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
 339                 PERF_COUNTER_TYPE_SHIFT;
 340 }
 341
 342 static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
 343 {
 344         return hw_event->config & PERF_COUNTER_EVENT_MASK;
 345 }
 346
 347 /**
 348  * struct hw_perf_counter - performance counter hardware details:
 349  */
 350 struct hw_perf_counter {
 351 #ifdef CONFIG_PERF_COUNTERS
 352         union {
 353                 struct { /* hardware */
 354                         u64                             config;
 355                         unsigned long                   config_base;
 356                         unsigned long                   counter_base;
 357                         int                             idx;
 358                 };
 359                 union { /* software */
 360                         atomic64_t                      count;
 361                         struct hrtimer                  hrtimer;
 362                 };
 363         };
 364         atomic64_t                      prev_count;
 365         u64                             sample_period;
 366         atomic64_t                      period_left;
 367         u64                             interrupts;
 368 #endif
 369 };
 370
 371 struct perf_counter;
 372
 373 /**
 374  * struct pmu - generic performance monitoring unit
 375  */
 376 struct pmu {
 377         int (*enable)                   (struct perf_counter *counter);
 378         void (*disable)                 (struct perf_counter *counter);
 379         void (*read)                    (struct perf_counter *counter);
 380         void (*unthrottle)              (struct perf_counter *counter);
 381 };
 382
 383 /**
 384  * enum perf_counter_active_state - the states of a counter
 385  */
 386 enum perf_counter_active_state {
 387         PERF_COUNTER_STATE_ERROR        = -2,
 388         PERF_COUNTER_STATE_OFF          = -1,
 389         PERF_COUNTER_STATE_INACTIVE     =  0,
 390         PERF_COUNTER_STATE_ACTIVE       =  1,
 391 };
 392
 393 struct file;
 394
 395 struct perf_mmap_data {
 396         struct rcu_head                 rcu_head;
 397         int                             nr_pages;       /* nr of data pages  */
 398         int                             nr_locked;      /* nr pages mlocked  */
 399
 400         atomic_t                        poll;           /* POLL_ for wakeups */
 401         atomic_t                        events;         /* event limit       */
 402
 403         atomic_long_t                   head;           /* write position    */
 404         atomic_long_t                   done_head;      /* completed head    */
 405
 406         atomic_t                        lock;           /* concurrent writes */
 407
 408         atomic_t                        wakeup;         /* needs a wakeup    */
 409
 410         struct perf_counter_mmap_page   *user_page;
 411         void                            *data_pages[0];
 412 };
 413
 414 struct perf_pending_entry {
 415         struct perf_pending_entry *next;
 416         void (*func)(struct perf_pending_entry *);
 417 };
 418
 419 /**
 420  * struct perf_counter - performance counter kernel representation:
 421  */
 422 struct perf_counter {
 423 #ifdef CONFIG_PERF_COUNTERS
 424         struct list_head                list_entry;
 425         struct list_head                event_entry;
 426         struct list_head                sibling_list;
 427         int                             nr_siblings;
 428         struct perf_counter             *group_leader;
 429         const struct pmu                *pmu;
 430
 431         enum perf_counter_active_state  state;
 432         atomic64_t                      count;
 433
 434         /*
 435          * These are the total time in nanoseconds that the counter
 436          * has been enabled (i.e. eligible to run, and the task has
 437          * been scheduled in, if this is a per-task counter)
 438          * and running (scheduled onto the CPU), respectively.
 439          *
 440          * They are computed from tstamp_enabled, tstamp_running and
 441          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 442          */
 443         u64                             total_time_enabled;
 444         u64                             total_time_running;
 445
 446         /*
 447          * These are timestamps used for computing total_time_enabled
 448          * and total_time_running when the counter is in INACTIVE or
 449          * ACTIVE state, measured in nanoseconds from an arbitrary point
 450          * in time.
 451          * tstamp_enabled: the notional time when the counter was enabled
 452          * tstamp_running: the notional time when the counter was scheduled on
 453          * tstamp_stopped: in INACTIVE state, the notional time when the
 454          *      counter was scheduled off.
 455          */
 456         u64                             tstamp_enabled;
 457         u64                             tstamp_running;
 458         u64                             tstamp_stopped;
 459
 460         struct perf_counter_hw_event    hw_event;
 461         struct hw_perf_counter          hw;
 462
 463         struct perf_counter_context     *ctx;
 464         struct file                     *filp;
 465
 466         /*
 467          * These accumulate total time (in nanoseconds) that children
 468          * counters have been enabled and running, respectively.
 469          */
 470         atomic64_t                      child_total_time_enabled;
 471         atomic64_t                      child_total_time_running;
 472
 473         /*
 474          * Protect attach/detach and child_list:
 475          */
 476         struct mutex                    child_mutex;
 477         struct list_head                child_list;
 478         struct perf_counter             *parent;
 479
 480         int                             oncpu;
 481         int                             cpu;
 482
 483         struct list_head                owner_entry;
 484         struct task_struct              *owner;
 485
 486         /* mmap bits */
 487         struct mutex                    mmap_mutex;
 488         atomic_t                        mmap_count;
 489         struct perf_mmap_data           *data;
 490
 491         /* poll related */
 492         wait_queue_head_t               waitq;
 493         struct fasync_struct            *fasync;
 494
 495         /* delayed work for NMIs and such */
 496         int                             pending_wakeup;
 497         int                             pending_kill;
 498         int                             pending_disable;
 499         struct perf_pending_entry       pending;
 500
 501         atomic_t                        event_limit;
 502
 503         void (*destroy)(struct perf_counter *);
 504         struct rcu_head                 rcu_head;
 505
 506         struct pid_namespace            *ns;
 507         u64                             id;
 508 #endif
 509 };
 510
 511 /**
 512  * struct perf_counter_context - counter context structure
 513  *
 514  * Used as a container for task counters and CPU counters as well:
 515  */
 516 struct perf_counter_context {
 517         /*
 518          * Protect the states of the counters in the list,
 519          * nr_active, and the list:
 520          */
 521         spinlock_t              lock;
 522         /*
 523          * Protect the list of counters.  Locking either mutex or lock
 524          * is sufficient to ensure the list doesn't change; to change
 525          * the list you need to lock both the mutex and the spinlock.
 526          */
 527         struct mutex            mutex;
 528
 529         struct list_head        counter_list;
 530         struct list_head        event_list;
 531         int                     nr_counters;
 532         int                     nr_active;
 533         int                     is_active;
 534         atomic_t                refcount;
 535         struct task_struct      *task;
 536
 537         /*
 538          * Context clock, runs when context enabled.
 539          */
 540         u64                     time;
 541         u64                     timestamp;
 542
 543         /*
 544          * These fields let us detect when two contexts have both
 545          * been cloned (inherited) from a common ancestor.
 546          */
 547         struct perf_counter_context *parent_ctx;
 548         u64                     parent_gen;
 549         u64                     generation;
 550         int                     pin_count;
 551         struct rcu_head         rcu_head;
 552 };
 553
 554 /**
 555  * struct perf_counter_cpu_context - per cpu counter context structure
 556  */
 557 struct perf_cpu_context {
 558         struct perf_counter_context     ctx;
 559         struct perf_counter_context     *task_ctx;
 560         int                             active_oncpu;
 561         int                             max_pertask;
 562         int                             exclusive;
 563
 564         /*
 565          * Recursion avoidance:
 566          *
 567          * task, softirq, irq, nmi context
 568          */
 569         int                             recursion[4];
 570 };
 571
 572 #ifdef CONFIG_PERF_COUNTERS
 573
 574 /*
 575  * Set by architecture code:
 576  */
 577 extern int perf_max_counters;
 578
 579 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 580
 581 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 582 extern void perf_counter_task_sched_out(struct task_struct *task,
 583                                         struct task_struct *next, int cpu);
 584 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 585 extern int perf_counter_init_task(struct task_struct *child);
 586 extern void perf_counter_exit_task(struct task_struct *child);
 587 extern void perf_counter_free_task(struct task_struct *task);
 588 extern void perf_counter_do_pending(void);
 589 extern void perf_counter_print_debug(void);
 590 extern void __perf_disable(void);
 591 extern bool __perf_enable(void);
 592 extern void perf_disable(void);
 593 extern void perf_enable(void);
 594 extern int perf_counter_task_disable(void);
 595 extern int perf_counter_task_enable(void);
 596 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 597                struct perf_cpu_context *cpuctx,
 598                struct perf_counter_context *ctx, int cpu);
 599 extern void perf_counter_update_userpage(struct perf_counter *counter);
 600
 601 extern int perf_counter_overflow(struct perf_counter *counter,
 602                                  int nmi, struct pt_regs *regs, u64 addr);
 603 /*
 604  * Return 1 for a software counter, 0 for a hardware counter
 605  */
 606 static inline int is_software_counter(struct perf_counter *counter)
 607 {
 608         return !perf_event_raw(&counter->hw_event) &&
 609                 perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
 610 }
 611
 612 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 613
 614 extern void perf_counter_mmap(unsigned long addr, unsigned long len,
 615                               unsigned long pgoff, struct file *file);
 616
 617 extern void perf_counter_munmap(unsigned long addr, unsigned long len,
 618                                 unsigned long pgoff, struct file *file);
 619
 620 extern void perf_counter_comm(struct task_struct *tsk);
 621
 622 extern void perf_counter_task_migration(struct task_struct *task, int cpu);
 623
 624 #define MAX_STACK_DEPTH         255
 625
 626 struct perf_callchain_entry {
 627         u16     nr, hv, kernel, user;
 628         u64     ip[MAX_STACK_DEPTH];
 629 };
 630
 631 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 632
 633 extern int sysctl_perf_counter_priv;
 634 extern int sysctl_perf_counter_mlock;
 635 extern int sysctl_perf_counter_limit;
 636
 637 extern void perf_counter_init(void);
 638
 639 #ifndef perf_misc_flags
 640 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_EVENT_MISC_USER : \
 641                                  PERF_EVENT_MISC_KERNEL)
 642 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 643 #endif
 644
 645 #else
 646 static inline void
 647 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 648 static inline void
 649 perf_counter_task_sched_out(struct task_struct *task,
 650                             struct task_struct *next, int cpu)          { }
 651 static inline void
 652 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 653 static inline int perf_counter_init_task(struct task_struct *child)     { return 0; }
 654 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 655 static inline void perf_counter_free_task(struct task_struct *task)     { }
 656 static inline void perf_counter_do_pending(void)                        { }
 657 static inline void perf_counter_print_debug(void)                       { }
 658 static inline void perf_disable(void)                                   { }
 659 static inline void perf_enable(void)                                    { }
 660 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 661 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 662
 663 static inline void
 664 perf_swcounter_event(u32 event, u64 nr, int nmi,
 665                      struct pt_regs *regs, u64 addr)                    { }
 666
 667 static inline void
 668 perf_counter_mmap(unsigned long addr, unsigned long len,
 669                   unsigned long pgoff, struct file *file)               { }
 670
 671 static inline void
 672 perf_counter_munmap(unsigned long addr, unsigned long len,
 673                     unsigned long pgoff, struct file *file)             { }
 674
 675 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 676 static inline void perf_counter_init(void)                              { }
 677 static inline void perf_counter_task_migration(struct task_struct *task,
 678                                                int cpu)                 { }
 679 #endif
 680
 681 #endif /* __KERNEL__ */
 682 #endif /* _LINUX_PERF_COUNTER_H */