git.oblomov.eu Git - linux-2.6/blob - 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         PERF_SAMPLE_MAX = 1U << 9,              /* non-ABI */
 125 };
 126
 127 /*
 128  * Bits that can be set in attr.read_format to request that
 129  * reads on the counter should return the indicated quantities,
 130  * in increasing order of bit value, after the counter value.
 131  */
 132 enum perf_counter_read_format {
 133         PERF_FORMAT_TOTAL_TIME_ENABLED          = 1U << 0,
 134         PERF_FORMAT_TOTAL_TIME_RUNNING          = 1U << 1,
 135         PERF_FORMAT_ID                          = 1U << 2,
 136
 137         PERF_FORMAT_MAX = 1U << 3,              /* non-ABI */
 138 };
 139
 140 #define PERF_ATTR_SIZE_VER0     64      /* sizeof first published struct */
 141
 142 /*
 143  * Hardware event to monitor via a performance monitoring counter:
 144  */
 145 struct perf_counter_attr {
 146
 147         /*
 148          * Major type: hardware/software/tracepoint/etc.
 149          */
 150         __u32                   type;
 151
 152         /*
 153          * Size of the attr structure, for fwd/bwd compat.
 154          */
 155         __u32                   size;
 156
 157         /*
 158          * Type specific configuration information.
 159          */
 160         __u64                   config;
 161
 162         union {
 163                 __u64           sample_period;
 164                 __u64           sample_freq;
 165         };
 166
 167         __u64                   sample_type;
 168         __u64                   read_format;
 169
 170         __u64                   disabled       :  1, /* off by default        */
 171                                 inherit        :  1, /* children inherit it   */
 172                                 pinned         :  1, /* must always be on PMU */
 173                                 exclusive      :  1, /* only group on PMU     */
 174                                 exclude_user   :  1, /* don't count user      */
 175                                 exclude_kernel :  1, /* ditto kernel          */
 176                                 exclude_hv     :  1, /* ditto hypervisor      */
 177                                 exclude_idle   :  1, /* don't count when idle */
 178                                 mmap           :  1, /* include mmap data     */
 179                                 comm           :  1, /* include comm data     */
 180                                 freq           :  1, /* use freq, not period  */
 181
 182                                 __reserved_1   : 53;
 183
 184         __u32                   wakeup_events;  /* wakeup every n events */
 185         __u32                   __reserved_2;
 186
 187         __u64                   __reserved_3;
 188 };
 189
 190 /*
 191  * Ioctls that can be done on a perf counter fd:
 192  */
 193 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 194 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 195 #define PERF_COUNTER_IOC_REFRESH        _IO ('$', 2)
 196 #define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 197 #define PERF_COUNTER_IOC_PERIOD         _IOW('$', 4, u64)
 198
 199 enum perf_counter_ioc_flags {
 200         PERF_IOC_FLAG_GROUP             = 1U << 0,
 201 };
 202
 203 /*
 204  * Structure of the page that can be mapped via mmap
 205  */
 206 struct perf_counter_mmap_page {
 207         __u32   version;                /* version number of this structure */
 208         __u32   compat_version;         /* lowest version this is compat with */
 209
 210         /*
 211          * Bits needed to read the hw counters in user-space.
 212          *
 213          *   u32 seq;
 214          *   s64 count;
 215          *
 216          *   do {
 217          *     seq = pc->lock;
 218          *
 219          *     barrier()
 220          *     if (pc->index) {
 221          *       count = pmc_read(pc->index - 1);
 222          *       count += pc->offset;
 223          *     } else
 224          *       goto regular_read;
 225          *
 226          *     barrier();
 227          *   } while (pc->lock != seq);
 228          *
 229          * NOTE: for obvious reason this only works on self-monitoring
 230          *       processes.
 231          */
 232         __u32   lock;                   /* seqlock for synchronization */
 233         __u32   index;                  /* hardware counter identifier */
 234         __s64   offset;                 /* add to hardware counter value */
 235
 236         /*
 237          * Control data for the mmap() data buffer.
 238          *
 239          * User-space reading this value should issue an rmb(), on SMP capable
 240          * platforms, after reading this value -- see perf_counter_wakeup().
 241          */
 242         __u64   data_head;              /* head in the data section */
 243 };
 244
 245 #define PERF_EVENT_MISC_CPUMODE_MASK            (3 << 0)
 246 #define PERF_EVENT_MISC_CPUMODE_UNKNOWN         (0 << 0)
 247 #define PERF_EVENT_MISC_KERNEL                  (1 << 0)
 248 #define PERF_EVENT_MISC_USER                    (2 << 0)
 249 #define PERF_EVENT_MISC_HYPERVISOR              (3 << 0)
 250 #define PERF_EVENT_MISC_OVERFLOW                (1 << 2)
 251
 252 struct perf_event_header {
 253         __u32   type;
 254         __u16   misc;
 255         __u16   size;
 256 };
 257
 258 enum perf_event_type {
 259
 260         /*
 261          * The MMAP events record the PROT_EXEC mappings so that we can
 262          * correlate userspace IPs to code. They have the following structure:
 263          *
 264          * struct {
 265          *      struct perf_event_header        header;
 266          *
 267          *      u32                             pid, tid;
 268          *      u64                             addr;
 269          *      u64                             len;
 270          *      u64                             pgoff;
 271          *      char                            filename[];
 272          * };
 273          */
 274         PERF_EVENT_MMAP                 = 1,
 275
 276         /*
 277          * struct {
 278          *      struct perf_event_header        header;
 279          *
 280          *      u32                             pid, tid;
 281          *      char                            comm[];
 282          * };
 283          */
 284         PERF_EVENT_COMM                 = 3,
 285
 286         /*
 287          * struct {
 288          *      struct perf_event_header        header;
 289          *      u64                             time;
 290          *      u64                             id;
 291          *      u64                             sample_period;
 292          * };
 293          */
 294         PERF_EVENT_PERIOD               = 4,
 295
 296         /*
 297          * struct {
 298          *      struct perf_event_header        header;
 299          *      u64                             time;
 300          *      u64                             id;
 301          * };
 302          */
 303         PERF_EVENT_THROTTLE             = 5,
 304         PERF_EVENT_UNTHROTTLE           = 6,
 305
 306         /*
 307          * struct {
 308          *      struct perf_event_header        header;
 309          *      u32                             pid, ppid;
 310          * };
 311          */
 312         PERF_EVENT_FORK                 = 7,
 313
 314         /*
 315          * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
 316          * will be PERF_RECORD_*
 317          *
 318          * struct {
 319          *      struct perf_event_header        header;
 320          *
 321          *      { u64                   ip;       } && PERF_RECORD_IP
 322          *      { u32                   pid, tid; } && PERF_RECORD_TID
 323          *      { u64                   time;     } && PERF_RECORD_TIME
 324          *      { u64                   addr;     } && PERF_RECORD_ADDR
 325          *      { u64                   config;   } && PERF_RECORD_CONFIG
 326          *      { u32                   cpu, res; } && PERF_RECORD_CPU
 327          *
 328          *      { u64                   nr;
 329          *        { u64 id, val; }      cnt[nr];  } && PERF_RECORD_GROUP
 330          *
 331          *      { u16                   nr,
 332          *                              hv,
 333          *                              kernel,
 334          *                              user;
 335          *        u64                   ips[nr];  } && PERF_RECORD_CALLCHAIN
 336          * };
 337          */
 338 };
 339
 340 #ifdef __KERNEL__
 341 /*
 342  * Kernel-internal data types and definitions:
 343  */
 344
 345 #ifdef CONFIG_PERF_COUNTERS
 346 # include <asm/perf_counter.h>
 347 #endif
 348
 349 #include <linux/list.h>
 350 #include <linux/mutex.h>
 351 #include <linux/rculist.h>
 352 #include <linux/rcupdate.h>
 353 #include <linux/spinlock.h>
 354 #include <linux/hrtimer.h>
 355 #include <linux/fs.h>
 356 #include <linux/pid_namespace.h>
 357 #include <asm/atomic.h>
 358
 359 struct task_struct;
 360
 361 /**
 362  * struct hw_perf_counter - performance counter hardware details:
 363  */
 364 struct hw_perf_counter {
 365 #ifdef CONFIG_PERF_COUNTERS
 366         union {
 367                 struct { /* hardware */
 368                         u64             config;
 369                         unsigned long   config_base;
 370                         unsigned long   counter_base;
 371                         int             idx;
 372                 };
 373                 union { /* software */
 374                         atomic64_t      count;
 375                         struct hrtimer  hrtimer;
 376                 };
 377         };
 378         atomic64_t                      prev_count;
 379         u64                             sample_period;
 380         u64                             last_period;
 381         atomic64_t                      period_left;
 382         u64                             interrupts;
 383
 384         u64                             freq_count;
 385         u64                             freq_interrupts;
 386         u64                             freq_stamp;
 387 #endif
 388 };
 389
 390 struct perf_counter;
 391
 392 /**
 393  * struct pmu - generic performance monitoring unit
 394  */
 395 struct pmu {
 396         int (*enable)                   (struct perf_counter *counter);
 397         void (*disable)                 (struct perf_counter *counter);
 398         void (*read)                    (struct perf_counter *counter);
 399         void (*unthrottle)              (struct perf_counter *counter);
 400 };
 401
 402 /**
 403  * enum perf_counter_active_state - the states of a counter
 404  */
 405 enum perf_counter_active_state {
 406         PERF_COUNTER_STATE_ERROR        = -2,
 407         PERF_COUNTER_STATE_OFF          = -1,
 408         PERF_COUNTER_STATE_INACTIVE     =  0,
 409         PERF_COUNTER_STATE_ACTIVE       =  1,
 410 };
 411
 412 struct file;
 413
 414 struct perf_mmap_data {
 415         struct rcu_head                 rcu_head;
 416         int                             nr_pages;       /* nr of data pages  */
 417         int                             nr_locked;      /* nr pages mlocked  */
 418
 419         atomic_t                        poll;           /* POLL_ for wakeups */
 420         atomic_t                        events;         /* event limit       */
 421
 422         atomic_long_t                   head;           /* write position    */
 423         atomic_long_t                   done_head;      /* completed head    */
 424
 425         atomic_t                        lock;           /* concurrent writes */
 426
 427         atomic_t                        wakeup;         /* needs a wakeup    */
 428
 429         struct perf_counter_mmap_page   *user_page;
 430         void                            *data_pages[0];
 431 };
 432
 433 struct perf_pending_entry {
 434         struct perf_pending_entry *next;
 435         void (*func)(struct perf_pending_entry *);
 436 };
 437
 438 /**
 439  * struct perf_counter - performance counter kernel representation:
 440  */
 441 struct perf_counter {
 442 #ifdef CONFIG_PERF_COUNTERS
 443         struct list_head                list_entry;
 444         struct list_head                event_entry;
 445         struct list_head                sibling_list;
 446         int                             nr_siblings;
 447         struct perf_counter             *group_leader;
 448         const struct pmu                *pmu;
 449
 450         enum perf_counter_active_state  state;
 451         atomic64_t                      count;
 452
 453         /*
 454          * These are the total time in nanoseconds that the counter
 455          * has been enabled (i.e. eligible to run, and the task has
 456          * been scheduled in, if this is a per-task counter)
 457          * and running (scheduled onto the CPU), respectively.
 458          *
 459          * They are computed from tstamp_enabled, tstamp_running and
 460          * tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
 461          */
 462         u64                             total_time_enabled;
 463         u64                             total_time_running;
 464
 465         /*
 466          * These are timestamps used for computing total_time_enabled
 467          * and total_time_running when the counter is in INACTIVE or
 468          * ACTIVE state, measured in nanoseconds from an arbitrary point
 469          * in time.
 470          * tstamp_enabled: the notional time when the counter was enabled
 471          * tstamp_running: the notional time when the counter was scheduled on
 472          * tstamp_stopped: in INACTIVE state, the notional time when the
 473          *      counter was scheduled off.
 474          */
 475         u64                             tstamp_enabled;
 476         u64                             tstamp_running;
 477         u64                             tstamp_stopped;
 478
 479         struct perf_counter_attr        attr;
 480         struct hw_perf_counter          hw;
 481
 482         struct perf_counter_context     *ctx;
 483         struct file                     *filp;
 484
 485         /*
 486          * These accumulate total time (in nanoseconds) that children
 487          * counters have been enabled and running, respectively.
 488          */
 489         atomic64_t                      child_total_time_enabled;
 490         atomic64_t                      child_total_time_running;
 491
 492         /*
 493          * Protect attach/detach and child_list:
 494          */
 495         struct mutex                    child_mutex;
 496         struct list_head                child_list;
 497         struct perf_counter             *parent;
 498
 499         int                             oncpu;
 500         int                             cpu;
 501
 502         struct list_head                owner_entry;
 503         struct task_struct              *owner;
 504
 505         /* mmap bits */
 506         struct mutex                    mmap_mutex;
 507         atomic_t                        mmap_count;
 508         struct perf_mmap_data           *data;
 509
 510         /* poll related */
 511         wait_queue_head_t               waitq;
 512         struct fasync_struct            *fasync;
 513
 514         /* delayed work for NMIs and such */
 515         int                             pending_wakeup;
 516         int                             pending_kill;
 517         int                             pending_disable;
 518         struct perf_pending_entry       pending;
 519
 520         atomic_t                        event_limit;
 521
 522         void (*destroy)(struct perf_counter *);
 523         struct rcu_head                 rcu_head;
 524
 525         struct pid_namespace            *ns;
 526         u64                             id;
 527 #endif
 528 };
 529
 530 /**
 531  * struct perf_counter_context - counter context structure
 532  *
 533  * Used as a container for task counters and CPU counters as well:
 534  */
 535 struct perf_counter_context {
 536         /*
 537          * Protect the states of the counters in the list,
 538          * nr_active, and the list:
 539          */
 540         spinlock_t                      lock;
 541         /*
 542          * Protect the list of counters.  Locking either mutex or lock
 543          * is sufficient to ensure the list doesn't change; to change
 544          * the list you need to lock both the mutex and the spinlock.
 545          */
 546         struct mutex                    mutex;
 547
 548         struct list_head                counter_list;
 549         struct list_head                event_list;
 550         int                             nr_counters;
 551         int                             nr_active;
 552         int                             is_active;
 553         atomic_t                        refcount;
 554         struct task_struct              *task;
 555
 556         /*
 557          * Context clock, runs when context enabled.
 558          */
 559         u64                             time;
 560         u64                             timestamp;
 561
 562         /*
 563          * These fields let us detect when two contexts have both
 564          * been cloned (inherited) from a common ancestor.
 565          */
 566         struct perf_counter_context     *parent_ctx;
 567         u64                             parent_gen;
 568         u64                             generation;
 569         int                             pin_count;
 570         struct rcu_head                 rcu_head;
 571 };
 572
 573 /**
 574  * struct perf_counter_cpu_context - per cpu counter context structure
 575  */
 576 struct perf_cpu_context {
 577         struct perf_counter_context     ctx;
 578         struct perf_counter_context     *task_ctx;
 579         int                             active_oncpu;
 580         int                             max_pertask;
 581         int                             exclusive;
 582
 583         /*
 584          * Recursion avoidance:
 585          *
 586          * task, softirq, irq, nmi context
 587          */
 588         int                             recursion[4];
 589 };
 590
 591 #ifdef CONFIG_PERF_COUNTERS
 592
 593 /*
 594  * Set by architecture code:
 595  */
 596 extern int perf_max_counters;
 597
 598 extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
 599
 600 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 601 extern void perf_counter_task_sched_out(struct task_struct *task,
 602                                         struct task_struct *next, int cpu);
 603 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 604 extern int perf_counter_init_task(struct task_struct *child);
 605 extern void perf_counter_exit_task(struct task_struct *child);
 606 extern void perf_counter_free_task(struct task_struct *task);
 607 extern void perf_counter_do_pending(void);
 608 extern void perf_counter_print_debug(void);
 609 extern void __perf_disable(void);
 610 extern bool __perf_enable(void);
 611 extern void perf_disable(void);
 612 extern void perf_enable(void);
 613 extern int perf_counter_task_disable(void);
 614 extern int perf_counter_task_enable(void);
 615 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 616                struct perf_cpu_context *cpuctx,
 617                struct perf_counter_context *ctx, int cpu);
 618 extern void perf_counter_update_userpage(struct perf_counter *counter);
 619
 620 struct perf_sample_data {
 621         struct pt_regs                  *regs;
 622         u64                             addr;
 623         u64                             period;
 624 };
 625
 626 extern int perf_counter_overflow(struct perf_counter *counter, int nmi,
 627                                  struct perf_sample_data *data);
 628
 629 /*
 630  * Return 1 for a software counter, 0 for a hardware counter
 631  */
 632 static inline int is_software_counter(struct perf_counter *counter)
 633 {
 634         return (counter->attr.type != PERF_TYPE_RAW) &&
 635                 (counter->attr.type != PERF_TYPE_HARDWARE) &&
 636                 (counter->attr.type != PERF_TYPE_HW_CACHE);
 637 }
 638
 639 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
 640
 641 extern void __perf_counter_mmap(struct vm_area_struct *vma);
 642
 643 static inline void perf_counter_mmap(struct vm_area_struct *vma)
 644 {
 645         if (vma->vm_flags & VM_EXEC)
 646                 __perf_counter_mmap(vma);
 647 }
 648
 649 extern void perf_counter_comm(struct task_struct *tsk);
 650 extern void perf_counter_fork(struct task_struct *tsk);
 651
 652 extern void perf_counter_task_migration(struct task_struct *task, int cpu);
 653
 654 #define MAX_STACK_DEPTH                 255
 655
 656 struct perf_callchain_entry {
 657         u16                             nr;
 658         u16                             hv;
 659         u16                             kernel;
 660         u16                             user;
 661         u64                             ip[MAX_STACK_DEPTH];
 662 };
 663
 664 extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
 665
 666 extern int sysctl_perf_counter_paranoid;
 667 extern int sysctl_perf_counter_mlock;
 668 extern int sysctl_perf_counter_sample_rate;
 669
 670 extern void perf_counter_init(void);
 671
 672 #ifndef perf_misc_flags
 673 #define perf_misc_flags(regs)   (user_mode(regs) ? PERF_EVENT_MISC_USER : \
 674                                  PERF_EVENT_MISC_KERNEL)
 675 #define perf_instruction_pointer(regs)  instruction_pointer(regs)
 676 #endif
 677
 678 #else
 679 static inline void
 680 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
 681 static inline void
 682 perf_counter_task_sched_out(struct task_struct *task,
 683                             struct task_struct *next, int cpu)          { }
 684 static inline void
 685 perf_counter_task_tick(struct task_struct *task, int cpu)               { }
 686 static inline int perf_counter_init_task(struct task_struct *child)     { return 0; }
 687 static inline void perf_counter_exit_task(struct task_struct *child)    { }
 688 static inline void perf_counter_free_task(struct task_struct *task)     { }
 689 static inline void perf_counter_do_pending(void)                        { }
 690 static inline void perf_counter_print_debug(void)                       { }
 691 static inline void perf_disable(void)                                   { }
 692 static inline void perf_enable(void)                                    { }
 693 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 694 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
 695
 696 static inline void
 697 perf_swcounter_event(u32 event, u64 nr, int nmi,
 698                      struct pt_regs *regs, u64 addr)                    { }
 699
 700 static inline void perf_counter_mmap(struct vm_area_struct *vma)        { }
 701 static inline void perf_counter_comm(struct task_struct *tsk)           { }
 702 static inline void perf_counter_fork(struct task_struct *tsk)           { }
 703 static inline void perf_counter_init(void)                              { }
 704 static inline void perf_counter_task_migration(struct task_struct *task,
 705                                                int cpu)                 { }
 706 #endif
 707
 708 #endif /* __KERNEL__ */
 709 #endif /* _LINUX_PERF_COUNTER_H */