ltt-tracer.h

   1 /*
   2  * Copyright (C) 2005,2006,2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
   3  *
   4  * This contains the definitions for the Linux Trace Toolkit tracer.
   5  *
   6  * Dual LGPL v2.1/GPL v2 license.
   7  */
   8
   9 #ifndef _LTT_TRACER_H
  10 #define _LTT_TRACER_H
  11
  12 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
  13 /* Align data on its natural alignment */
  14 #define RING_BUFFER_ALIGN
  15 #endif
  16
  17 #include <linux/ringbuffer/config.h>
  18
  19 #include <stdarg.h>
  20 #include <linux/types.h>
  21 #include <linux/limits.h>
  22 #include <linux/list.h>
  23 #include <linux/cache.h>
  24 #include <linux/kernel.h>
  25 #include <linux/timex.h>
  26 #include <linux/wait.h>
  27 #include <linux/marker.h>
  28 #include <linux/trace-clock.h>
  29 #include <asm/atomic.h>
  30 #include <asm/local.h>
  31
  32 #include "ltt-tracer-core.h"
  33 #include "ltt-channels.h"
  34
  35 /* Number of bytes to log with a read/write event */
  36 #define LTT_LOG_RW_SIZE                 32L
  37
  38 struct ltt_active_marker;
  39
  40 /* Maximum number of callbacks per marker */
  41 #define LTT_NR_CALLBACKS        10
  42
  43 struct ltt_serialize_closure {
  44         ltt_serialize_cb *callbacks;
  45         long cb_args[LTT_NR_CALLBACKS];
  46         unsigned int cb_idx;
  47 };
  48
  49 size_t ltt_serialize_data(struct ltt_chanbuf *buf, size_t buf_offset,
  50                           struct ltt_serialize_closure *closure,
  51                           void *serialize_private, unsigned int stack_pos_ctx,
  52                           int *largest_align, const char *fmt, va_list *args);
  53
  54 struct ltt_available_probe {
  55         const char *name;               /* probe name */
  56         const char *format;
  57         marker_probe_func *probe_func;
  58         ltt_serialize_cb callbacks[LTT_NR_CALLBACKS];
  59         struct list_head node;          /* registered probes list */
  60 };
  61
  62 enum ltt_channels {
  63         LTT_CHANNEL_METADATA,
  64         LTT_CHANNEL_FD_STATE,
  65         LTT_CHANNEL_GLOBAL_STATE,
  66         LTT_CHANNEL_IRQ_STATE,
  67         LTT_CHANNEL_MODULE_STATE,
  68         LTT_CHANNEL_NETIF_STATE,
  69         LTT_CHANNEL_SOFTIRQ_STATE,
  70         LTT_CHANNEL_SWAP_STATE,
  71         LTT_CHANNEL_SYSCALL_STATE,
  72         LTT_CHANNEL_TASK_STATE,
  73         LTT_CHANNEL_VM_STATE,
  74         LTT_CHANNEL_FS,
  75         LTT_CHANNEL_INPUT,
  76         LTT_CHANNEL_IPC,
  77         LTT_CHANNEL_KERNEL,
  78         LTT_CHANNEL_MM,
  79         LTT_CHANNEL_RCU,
  80         LTT_CHANNEL_DEFAULT,
  81 };
  82
  83 struct ltt_active_marker {
  84         struct list_head node;          /* active markers list */
  85         const char *channel;
  86         const char *name;
  87         const char *format;
  88         struct ltt_available_probe *probe;
  89 };
  90
  91 extern void ltt_vtrace(const struct marker *mdata, void *probe_data,
  92                        void *call_data, const char *fmt, va_list *args);
  93 extern void ltt_trace(const struct marker *mdata, void *probe_data,
  94                       void *call_data, const char *fmt, ...);
  95
  96 size_t ltt_serialize_printf(struct ltt_chanbuf *buf, unsigned long buf_offset,
  97                             size_t *msg_size, char *output, size_t outlen,
  98                             const char *fmt);
  99
 100 /*
 101  * Unique ID assigned to each registered probe.
 102  */
 103 enum marker_id {
 104         MARKER_ID_SET_MARKER_ID = 0,    /* Static IDs available (range 0-7) */
 105         MARKER_ID_SET_MARKER_FORMAT,
 106         MARKER_ID_COMPACT,              /* Compact IDs (range: 8-127)       */
 107         MARKER_ID_DYNAMIC,              /* Dynamic IDs (range: 128-65535)   */
 108 };
 109
 110 /* static ids 0-1 reserved for internal use. */
 111 #define MARKER_CORE_IDS         2
 112 static __inline__ enum marker_id marker_id_type(uint16_t id)
 113 {
 114         if (id < MARKER_CORE_IDS)
 115                 return (enum marker_id)id;
 116         else
 117                 return MARKER_ID_DYNAMIC;
 118 }
 119
 120 struct user_dbg_data {
 121         unsigned long avail_size;
 122         unsigned long write;
 123         unsigned long read;
 124 };
 125
 126 struct ltt_trace_ops {
 127         int (*create_dirs) (struct ltt_trace *new_trace);
 128         void (*remove_dirs) (struct ltt_trace *new_trace);
 129 };
 130
 131 struct ltt_transport {
 132         char *name;
 133         struct module *owner;
 134         struct list_head node;
 135         struct ltt_trace_ops ops;
 136 };
 137
 138 enum trace_mode { LTT_TRACE_NORMAL, LTT_TRACE_FLIGHT, LTT_TRACE_HYBRID };
 139
 140 #define CHANNEL_FLAG_ENABLE     (1U<<0)
 141 #define CHANNEL_FLAG_OVERWRITE  (1U<<1)
 142
 143 /* Per-trace information - each trace/flight recorder represented by one */
 144 struct ltt_trace {
 145         /* First 32 bytes cache-hot cacheline */
 146         struct list_head list;
 147         struct ltt_chan **channels;
 148         unsigned int nr_channels;
 149         int active;
 150         /* Second 32 bytes cache-hot cacheline */
 151         struct ltt_trace_ops *ops;
 152         u32 freq_scale;
 153         u64 start_freq;
 154         u64 start_tsc;
 155         unsigned long long start_monotonic;
 156         struct timeval          start_time;
 157         struct ltt_channel_setting *settings;
 158         struct {
 159                 struct dentry                   *trace_root;
 160                 struct dentry                   *ascii_root;
 161         } dentry;
 162         struct kref kref; /* Each channel has a kref of the trace struct */
 163         struct ltt_transport *transport;
 164         struct kref ltt_transport_kref;
 165         wait_queue_head_t kref_wq; /* Place for ltt_trace_destroy to sleep */
 166         char trace_name[NAME_MAX];
 167 } ____cacheline_aligned;
 168
 169 /*
 170  * Hardcoded event headers
 171  *
 172  * event header for a trace with active heartbeat : 27 bits timestamps
 173  *
 174  * headers are 32-bits aligned. In order to insure such alignment, a dynamic per
 175  * trace alignment value must be done.
 176  *
 177  * Remember that the C compiler does align each member on the boundary
 178  * equivalent to their own size.
 179  *
 180  * As relay subbuffers are aligned on pages, we are sure that they are 4 and 8
 181  * bytes aligned, so the buffer header and trace header are aligned.
 182  *
 183  * Event headers are aligned depending on the trace alignment option.
 184  *
 185  * Note using C structure bitfields for cross-endianness and portability
 186  * concerns.
 187  */
 188
 189 #define LTT_RESERVED_EVENTS     3
 190 #define LTT_EVENT_BITS          5
 191 #define LTT_FREE_EVENTS         ((1 << LTT_EVENT_BITS) - LTT_RESERVED_EVENTS)
 192 #define LTT_TSC_BITS            27
 193 #define LTT_TSC_MASK            ((1 << LTT_TSC_BITS) - 1)
 194
 195 struct event_header {
 196         u32 id_time;            /* 5 bits event id (MSB); 27 bits time (LSB) */
 197 };
 198
 199 /* Reservation flags */
 200 #define LTT_RFLAG_ID                    (1 << 0)
 201 #define LTT_RFLAG_ID_SIZE               (1 << 1)
 202 #define LTT_RFLAG_ID_SIZE_TSC           (1 << 2)
 203
 204 #define LTT_MAX_SMALL_SIZE              0xFFFFU
 205
 206 /*
 207  * We use asm/timex.h : cpu_khz/HZ variable in here : we might have to deal
 208  * specifically with CPU frequency scaling someday, so using an interpolation
 209  * between the start and end of buffer values is not flexible enough. Using an
 210  * immediate frequency value permits to calculate directly the times for parts
 211  * of a buffer that would be before a frequency change.
 212  *
 213  * Keep the natural field alignment for _each field_ within this structure if
 214  * you ever add/remove a field from this header. Packed attribute is not used
 215  * because gcc generates poor code on at least powerpc and mips. Don't ever
 216  * let gcc add padding between the structure elements.
 217  */
 218 struct subbuffer_header {
 219         uint64_t cycle_count_begin;     /* Cycle count at subbuffer start */
 220         uint64_t cycle_count_end;       /* Cycle count at subbuffer end */
 221         uint32_t magic_number;          /*
 222                                          * Trace magic number.
 223                                          * contains endianness information.
 224                                          */
 225         uint8_t major_version;
 226         uint8_t minor_version;
 227         uint8_t arch_size;              /* Architecture pointer size */
 228         uint8_t alignment;              /* LTT data alignment */
 229         uint64_t start_time_sec;        /* NTP-corrected start time */
 230         uint64_t start_time_usec;
 231         uint64_t start_freq;            /*
 232                                          * Frequency at trace start,
 233                                          * used all along the trace.
 234                                          */
 235         uint32_t freq_scale;            /* Frequency scaling (divisor) */
 236         uint32_t data_size;             /* Size of data in subbuffer */
 237         uint32_t sb_size;               /* Subbuffer size (include padding) */
 238         uint32_t events_lost;           /*
 239                                          * Events lost in this subbuffer since
 240                                          * the beginning of the trace.
 241                                          * (may overflow)
 242                                          */
 243         uint32_t subbuf_corrupt;        /*
 244                                          * Corrupted (lost) subbuffers since
 245                                          * the begginig of the trace.
 246                                          * (may overflow)
 247                                          */
 248         uint8_t header_end[0];          /* End of header */
 249 };
 250
 251 static inline notrace u64 lib_ring_buffer_clock_read(struct channel *chan)
 252 {
 253         return trace_clock_read64();
 254 }
 255
 256 /*
 257  * record_header_size - Calculate the header size and padding necessary.
 258  * @config: ring buffer instance configuration
 259  * @chan: channel
 260  * @offset: offset in the write buffer
 261  * @data_size: size of the payload
 262  * @pre_header_padding: padding to add before the header (output)
 263  * @rflags: reservation flags
 264  * @ctx: reservation context
 265  *
 266  * Returns the event header size (including padding).
 267  *
 268  * Important note :
 269  * The event header must be 32-bits. The total offset calculated here :
 270  *
 271  * Alignment of header struct on 32 bits (min arch size, header size)
 272  * + sizeof(header struct)  (32-bits)
 273  * + (opt) u16 (ext. event id)
 274  * + (opt) u16 (event_size)
 275  *             (if event_size == LTT_MAX_SMALL_SIZE, has ext. event size)
 276  * + (opt) u32 (ext. event size)
 277  * + (opt) u64 full TSC (aligned on min(64-bits, arch size))
 278  *
 279  * The payload must itself determine its own alignment from the biggest type it
 280  * contains.
 281  */
 282 static __inline__
 283 unsigned char record_header_size(const struct lib_ring_buffer_config *config,
 284                                  struct channel *chan, size_t offset,
 285                                  size_t data_size, size_t *pre_header_padding,
 286                                  unsigned int rflags,
 287                                  struct lib_ring_buffer_ctx *ctx)
 288 {
 289         size_t orig_offset = offset;
 290         size_t padding;
 291
 292         BUILD_BUG_ON(sizeof(struct event_header) != sizeof(u32));
 293
 294         padding = lib_ring_buffer_align(config, offset,
 295                                         sizeof(struct event_header));
 296         offset += padding;
 297         offset += sizeof(struct event_header);
 298
 299         if (unlikely(rflags)) {
 300                 switch (rflags) {
 301                 case LTT_RFLAG_ID_SIZE_TSC:
 302                         offset += sizeof(u16) + sizeof(u16);
 303                         if (data_size >= LTT_MAX_SMALL_SIZE)
 304                                 offset += sizeof(u32);
 305                         offset += ltt_align(offset, sizeof(u64));
 306                         offset += sizeof(u64);
 307                         break;
 308                 case LTT_RFLAG_ID_SIZE:
 309                         offset += sizeof(u16) + sizeof(u16);
 310                         if (data_size >= LTT_MAX_SMALL_SIZE)
 311                                 offset += sizeof(u32);
 312                         break;
 313                 case LTT_RFLAG_ID:
 314                         offset += sizeof(u16);
 315                         break;
 316                 }
 317         }
 318
 319         *pre_header_padding = padding;
 320         return offset - orig_offset;
 321 }
 322
 323 #include <linux/ringbuffer/api.h>
 324
 325 extern
 326 size_t ltt_write_event_header_slow(struct ltt_chanbuf_alloc *bufa,
 327                                    struct ltt_chan_alloc *chana,
 328                                    long buf_offset, u16 eID, u32 event_size,
 329                                    u64 tsc, unsigned int rflags);
 330
 331 /*
 332  * ltt_write_event_header
 333  *
 334  * Writes the event header to the offset (already aligned on 32-bits).
 335  *
 336  * @config: ring buffer instance configuration
 337  * @ctx: reservation context
 338  * @eID : event ID
 339  * @event_size : size of the event, excluding the event header.
 340  */
 341 static __inline__
 342 void ltt_write_event_header(const struct lib_ring_buffer_config *config,
 343                             struct lib_ring_buffer_ctx *ctx,
 344                             u16 eID, u32 event_size)
 345 {
 346         struct event_header header;
 347
 348         if (unlikely(ctx->rflags))
 349                 goto slow_path;
 350
 351         header.id_time = eID << LTT_TSC_BITS;
 352         header.id_time |= (u32)ctx->tsc & LTT_TSC_MASK;
 353         lib_ring_buffer_write(config, ctx, &header, sizeof(header));
 354
 355 slow_path:
 356         ltt_write_event_header_slow(config, ctx, eID, event_size);
 357 }
 358
 359 #if 0
 360 /*
 361  * ltt_read_event_header
 362  * buf_offset must aligned on 32 bits
 363  */
 364 static __inline__
 365 size_t ltt_read_event_header(struct ltt_chanbuf_alloc *bufa, long buf_offset,
 366                              u64 *tsc, u32 *event_size, u16 *eID,
 367                              unsigned int *rflags)
 368 {
 369         struct ltt_event_header header;
 370         u16 small_size;
 371
 372         ltt_relay_read(bufa, buf_offset, &header, sizeof(header));
 373         buf_offset += sizeof(header);
 374
 375         *event_size = INT_MAX;
 376         *eID = header.id_time >> LTT_TSC_BITS;
 377         *tsc = header.id_time & LTT_TSC_MASK;
 378
 379         switch (*eID) {
 380         case 29:
 381                 *rflags = LTT_RFLAG_ID_SIZE_TSC;
 382                 ltt_relay_read(bufa, buf_offset, eID, sizeof(u16));
 383                 buf_offset += sizeof(u16);
 384                 ltt_relay_read(bufa, buf_offset, &small_size, sizeof(u16));
 385                 buf_offset += sizeof(u16);
 386                 if (small_size == LTT_MAX_SMALL_SIZE) {
 387                         ltt_relay_read(bufa, buf_offset, event_size,
 388                                         sizeof(u32));
 389                         buf_offset += sizeof(u32);
 390                 } else
 391                         *event_size = small_size;
 392                 buf_offset += ltt_align(buf_offset, sizeof(u64));
 393                 ltt_relay_read(bufa, buf_offset, tsc, sizeof(u64));
 394                 buf_offset += sizeof(u64);
 395                 break;
 396         case 30:
 397                 *rflags = LTT_RFLAG_ID_SIZE;
 398                 ltt_relay_read(bufa, buf_offset, eID, sizeof(u16));
 399                 buf_offset += sizeof(u16);
 400                 ltt_relay_read(bufa, buf_offset, &small_size, sizeof(u16));
 401                 buf_offset += sizeof(u16);
 402                 if (small_size == LTT_MAX_SMALL_SIZE) {
 403                         ltt_relay_read(bufa, buf_offset, event_size,
 404                                         sizeof(u32));
 405                         buf_offset += sizeof(u32);
 406                 } else
 407                         *event_size = small_size;
 408                 break;
 409         case 31:
 410                 *rflags = LTT_RFLAG_ID;
 411                 ltt_relay_read(bufa, buf_offset, eID, sizeof(u16));
 412                 buf_offset += sizeof(u16);
 413                 break;
 414         default:
 415                 *rflags = 0;
 416                 break;
 417         }
 418
 419         return buf_offset;
 420 }
 421 #endif //0
 422
 423 /*
 424  * Control channels :
 425  * control/metadata
 426  * control/interrupts
 427  * control/...
 428  *
 429  * cpu channel :
 430  * cpu
 431  */
 432 #define LTT_RELAY_ROOT                  "ltt"
 433
 434 #define LTT_METADATA_CHANNEL            "metadata_state"
 435 #define LTT_FD_STATE_CHANNEL            "fd_state"
 436 #define LTT_GLOBAL_STATE_CHANNEL        "global_state"
 437 #define LTT_IRQ_STATE_CHANNEL           "irq_state"
 438 #define LTT_MODULE_STATE_CHANNEL        "module_state"
 439 #define LTT_NETIF_STATE_CHANNEL         "netif_state"
 440 #define LTT_SOFTIRQ_STATE_CHANNEL       "softirq_state"
 441 #define LTT_SWAP_STATE_CHANNEL          "swap_state"
 442 #define LTT_SYSCALL_STATE_CHANNEL       "syscall_state"
 443 #define LTT_TASK_STATE_CHANNEL          "task_state"
 444 #define LTT_VM_STATE_CHANNEL            "vm_state"
 445 #define LTT_FS_CHANNEL                  "fs"
 446 #define LTT_INPUT_CHANNEL               "input"
 447 #define LTT_IPC_CHANNEL                 "ipc"
 448 #define LTT_KERNEL_CHANNEL              "kernel"
 449 #define LTT_MM_CHANNEL                  "mm"
 450 #define LTT_RCU_CHANNEL                 "rcu"
 451
 452 #define LTT_FLIGHT_PREFIX               "flight-"
 453
 454 #define LTT_ASCII                       "ascii"
 455
 456 /* Tracer properties */
 457 #define LTT_DEFAULT_SUBBUF_SIZE_LOW     65536
 458 #define LTT_DEFAULT_N_SUBBUFS_LOW       2
 459 #define LTT_DEFAULT_SUBBUF_SIZE_MED     262144
 460 #define LTT_DEFAULT_N_SUBBUFS_MED       2
 461 #define LTT_DEFAULT_SUBBUF_SIZE_HIGH    1048576
 462 #define LTT_DEFAULT_N_SUBBUFS_HIGH      2
 463 #define LTT_TRACER_MAGIC_NUMBER         0x00D6B7ED
 464 #define LTT_TRACER_VERSION_MAJOR        2
 465 #define LTT_TRACER_VERSION_MINOR        6
 466
 467 /**
 468  * ltt_write_trace_header - Write trace header
 469  * @priv: Private data (struct trace)
 470  * @header: Memory address where the information must be written to
 471  */
 472 static __inline__
 473 void ltt_write_trace_header(void *priv,
 474                             struct subbuffer_header *header)
 475 {
 476         struct ltt_trace *trace = priv;
 477
 478         header->magic_number = LTT_TRACER_MAGIC_NUMBER;
 479         header->major_version = LTT_TRACER_VERSION_MAJOR;
 480         header->minor_version = LTT_TRACER_VERSION_MINOR;
 481         header->arch_size = sizeof(void *);
 482         header->alignment = lib_ring_buffer_get_alignment();
 483         header->start_time_sec = trace->start_time.tv_sec;
 484         header->start_time_usec = trace->start_time.tv_usec;
 485         header->start_freq = trace->start_freq;
 486         header->freq_scale = trace->freq_scale;
 487 }
 488
 489 /*
 490  * Size reserved for high priority events (interrupts, NMI, BH) at the end of a
 491  * nearly full buffer. User space won't use this last amount of space when in
 492  * blocking mode. This space also includes the event header that would be
 493  * written by this user space event.
 494  */
 495 #define LTT_RESERVE_CRITICAL            4096
 496
 497 /* Register and unregister function pointers */
 498
 499 enum ltt_module_function {
 500         LTT_FUNCTION_RUN_FILTER,
 501         LTT_FUNCTION_FILTER_CONTROL,
 502         LTT_FUNCTION_STATEDUMP
 503 };
 504
 505 extern int ltt_module_register(enum ltt_module_function name, void *function,
 506                                struct module *owner);
 507 extern void ltt_module_unregister(enum ltt_module_function name);
 508
 509 void ltt_transport_register(struct ltt_transport *transport);
 510 void ltt_transport_unregister(struct ltt_transport *transport);
 511
 512 /* Exported control function */
 513
 514 enum ltt_control_msg {
 515         LTT_CONTROL_START,
 516         LTT_CONTROL_STOP,
 517         LTT_CONTROL_CREATE_TRACE,
 518         LTT_CONTROL_DESTROY_TRACE
 519 };
 520
 521 union ltt_control_args {
 522         struct {
 523                 enum trace_mode mode;
 524                 unsigned int subbuf_size_low;
 525                 unsigned int n_subbufs_low;
 526                 unsigned int subbuf_size_med;
 527                 unsigned int n_subbufs_med;
 528                 unsigned int subbuf_size_high;
 529                 unsigned int n_subbufs_high;
 530         } new_trace;
 531 };
 532
 533 int _ltt_trace_setup(const char *trace_name);
 534 int ltt_trace_setup(const char *trace_name);
 535 struct ltt_trace *_ltt_trace_find_setup(const char *trace_name);
 536 int ltt_trace_set_type(const char *trace_name, const char *trace_type);
 537 int ltt_trace_set_channel_subbufsize(const char *trace_name,
 538                                      const char *channel_name,
 539                                      unsigned int size);
 540 int ltt_trace_set_channel_subbufcount(const char *trace_name,
 541                                       const char *channel_name,
 542                                       unsigned int cnt);
 543 int ltt_trace_set_channel_switch_timer(const char *trace_name,
 544                                        const char *channel_name,
 545                                        unsigned long interval);
 546 int ltt_trace_set_channel_overwrite(const char *trace_name,
 547                                     const char *channel_name,
 548                                     unsigned int overwrite);
 549 int ltt_trace_alloc(const char *trace_name);
 550 int ltt_trace_destroy(const char *trace_name);
 551 int ltt_trace_start(const char *trace_name);
 552 int ltt_trace_stop(const char *trace_name);
 553
 554 extern int ltt_control(enum ltt_control_msg msg, const char *trace_name,
 555                        const char *trace_type, union ltt_control_args args);
 556
 557 enum ltt_filter_control_msg {
 558         LTT_FILTER_DEFAULT_ACCEPT,
 559         LTT_FILTER_DEFAULT_REJECT
 560 };
 561
 562 extern int ltt_filter_control(enum ltt_filter_control_msg msg,
 563                               const char *trace_name);
 564
 565 extern struct dentry *get_filter_root(void);
 566
 567 void ltt_core_register(int (*function)(u8, void *));
 568
 569 void ltt_core_unregister(void);
 570
 571 void ltt_release_trace(struct kref *kref);
 572 void ltt_release_transport(struct kref *kref);
 573
 574 extern int ltt_probe_register(struct ltt_available_probe *pdata);
 575 extern int ltt_probe_unregister(struct ltt_available_probe *pdata);
 576 extern int ltt_marker_connect(const char *channel, const char *mname,
 577                               const char *pname);
 578 extern int ltt_marker_disconnect(const char *channel, const char *mname,
 579                                  const char *pname);
 580 extern void ltt_dump_marker_state(struct ltt_trace *trace);
 581
 582 void ltt_lock_traces(void);
 583 void ltt_unlock_traces(void);
 584
 585 extern int ltt_ascii_create_dir(struct ltt_trace *new_trace);
 586 extern void ltt_ascii_remove_dir(struct ltt_trace *trace);
 587 extern int ltt_ascii_create(struct ltt_chan *chan);
 588 extern void ltt_ascii_remove(struct ltt_chan *chan);
 589
 590 extern
 591 void ltt_statedump_register_kprobes_dump(void (*callback)(void *call_data));
 592 extern
 593 void ltt_statedump_unregister_kprobes_dump(void (*callback)(void *call_data));
 594
 595 extern void ltt_dump_softirq_vec(void *call_data);
 596
 597 #ifdef CONFIG_HAVE_LTT_DUMP_TABLES
 598 extern void ltt_dump_sys_call_table(void *call_data);
 599 extern void ltt_dump_idt_table(void *call_data);
 600 #else
 601 static inline void ltt_dump_sys_call_table(void *call_data)
 602 {
 603 }
 604
 605 static inline void ltt_dump_idt_table(void *call_data)
 606 {
 607 }
 608 #endif
 609
 610 #endif /* _LTT_TRACER_H */