194b80ffdSSteven Rostedt /* 294b80ffdSSteven Rostedt * unlikely profiler 394b80ffdSSteven Rostedt * 494b80ffdSSteven Rostedt * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com> 594b80ffdSSteven Rostedt */ 694b80ffdSSteven Rostedt #include <linux/kallsyms.h> 794b80ffdSSteven Rostedt #include <linux/seq_file.h> 894b80ffdSSteven Rostedt #include <linux/spinlock.h> 965c6dc6aSFrederic Weisbecker #include <linux/irqflags.h> 1094b80ffdSSteven Rostedt #include <linux/debugfs.h> 1194b80ffdSSteven Rostedt #include <linux/uaccess.h> 1294b80ffdSSteven Rostedt #include <linux/module.h> 1394b80ffdSSteven Rostedt #include <linux/ftrace.h> 1494b80ffdSSteven Rostedt #include <linux/hash.h> 1594b80ffdSSteven Rostedt #include <linux/fs.h> 1694b80ffdSSteven Rostedt #include <asm/local.h> 17f633cef0SSteven Rostedt 1894b80ffdSSteven Rostedt #include "trace.h" 19002bb86dSFrederic Weisbecker #include "trace_stat.h" 20f633cef0SSteven Rostedt #include "trace_output.h" 2194b80ffdSSteven Rostedt 2294b80ffdSSteven Rostedt #ifdef CONFIG_BRANCH_TRACER 2394b80ffdSSteven Rostedt 24002bb86dSFrederic Weisbecker static struct tracer branch_trace; 2594b80ffdSSteven Rostedt static int branch_tracing_enabled __read_mostly; 2694b80ffdSSteven Rostedt static DEFINE_MUTEX(branch_tracing_mutex); 27e302cf3fSFrederic Weisbecker 2894b80ffdSSteven Rostedt static struct trace_array *branch_tracer; 2994b80ffdSSteven Rostedt 3094b80ffdSSteven Rostedt static void 3194b80ffdSSteven Rostedt probe_likely_condition(struct ftrace_branch_data *f, int val, int expect) 3294b80ffdSSteven Rostedt { 33e1112b4dSTom Zanussi struct ftrace_event_call *call = &event_branch; 3494b80ffdSSteven Rostedt struct trace_array *tr = branch_tracer; 3594b80ffdSSteven Rostedt struct ring_buffer_event *event; 3694b80ffdSSteven Rostedt struct trace_branch *entry; 378f6e8a31SSteven Rostedt struct ring_buffer *buffer; 380a987751SArnaldo Carvalho de Melo unsigned long flags; 3994b80ffdSSteven Rostedt int cpu, pc; 4094b80ffdSSteven Rostedt const char *p; 4194b80ffdSSteven Rostedt 4294b80ffdSSteven Rostedt /* 4394b80ffdSSteven Rostedt * I would love to save just the ftrace_likely_data pointer, but 4494b80ffdSSteven Rostedt * this code can also be used by modules. Ugly things can happen 4594b80ffdSSteven Rostedt * if the module is unloaded, and then we go and read the 4694b80ffdSSteven Rostedt * pointer. This is slower, but much safer. 4794b80ffdSSteven Rostedt */ 4894b80ffdSSteven Rostedt 4994b80ffdSSteven Rostedt if (unlikely(!tr)) 5094b80ffdSSteven Rostedt return; 5194b80ffdSSteven Rostedt 52a5e25883SSteven Rostedt local_irq_save(flags); 5394b80ffdSSteven Rostedt cpu = raw_smp_processor_id(); 5494b80ffdSSteven Rostedt if (atomic_inc_return(&tr->data[cpu]->disabled) != 1) 5594b80ffdSSteven Rostedt goto out; 5694b80ffdSSteven Rostedt 5751a763ddSArnaldo Carvalho de Melo pc = preempt_count(); 588f6e8a31SSteven Rostedt buffer = tr->buffer; 598f6e8a31SSteven Rostedt event = trace_buffer_lock_reserve(buffer, TRACE_BRANCH, 6051a763ddSArnaldo Carvalho de Melo sizeof(*entry), flags, pc); 6194b80ffdSSteven Rostedt if (!event) 6294b80ffdSSteven Rostedt goto out; 6394b80ffdSSteven Rostedt 6494b80ffdSSteven Rostedt entry = ring_buffer_event_data(event); 6594b80ffdSSteven Rostedt 6694b80ffdSSteven Rostedt /* Strip off the path, only save the file */ 6794b80ffdSSteven Rostedt p = f->file + strlen(f->file); 6894b80ffdSSteven Rostedt while (p >= f->file && *p != '/') 6994b80ffdSSteven Rostedt p--; 7094b80ffdSSteven Rostedt p++; 7194b80ffdSSteven Rostedt 7294b80ffdSSteven Rostedt strncpy(entry->func, f->func, TRACE_FUNC_SIZE); 7394b80ffdSSteven Rostedt strncpy(entry->file, p, TRACE_FILE_SIZE); 7494b80ffdSSteven Rostedt entry->func[TRACE_FUNC_SIZE] = 0; 7594b80ffdSSteven Rostedt entry->file[TRACE_FILE_SIZE] = 0; 7694b80ffdSSteven Rostedt entry->line = f->line; 7794b80ffdSSteven Rostedt entry->correct = val == expect; 7894b80ffdSSteven Rostedt 798f6e8a31SSteven Rostedt if (!filter_check_discard(call, entry, buffer, event)) 807ffbd48dSSteven Rostedt __buffer_unlock_commit(buffer, event); 8194b80ffdSSteven Rostedt 8294b80ffdSSteven Rostedt out: 8394b80ffdSSteven Rostedt atomic_dec(&tr->data[cpu]->disabled); 84a5e25883SSteven Rostedt local_irq_restore(flags); 8594b80ffdSSteven Rostedt } 8694b80ffdSSteven Rostedt 8794b80ffdSSteven Rostedt static inline 8894b80ffdSSteven Rostedt void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect) 8994b80ffdSSteven Rostedt { 9094b80ffdSSteven Rostedt if (!branch_tracing_enabled) 9194b80ffdSSteven Rostedt return; 9294b80ffdSSteven Rostedt 9394b80ffdSSteven Rostedt probe_likely_condition(f, val, expect); 9494b80ffdSSteven Rostedt } 9594b80ffdSSteven Rostedt 9694b80ffdSSteven Rostedt int enable_branch_tracing(struct trace_array *tr) 9794b80ffdSSteven Rostedt { 9894b80ffdSSteven Rostedt mutex_lock(&branch_tracing_mutex); 9994b80ffdSSteven Rostedt branch_tracer = tr; 10094b80ffdSSteven Rostedt /* 10194b80ffdSSteven Rostedt * Must be seen before enabling. The reader is a condition 10294b80ffdSSteven Rostedt * where we do not need a matching rmb() 10394b80ffdSSteven Rostedt */ 10494b80ffdSSteven Rostedt smp_wmb(); 10594b80ffdSSteven Rostedt branch_tracing_enabled++; 10694b80ffdSSteven Rostedt mutex_unlock(&branch_tracing_mutex); 10794b80ffdSSteven Rostedt 108f54fc98aSWenji Huang return 0; 10994b80ffdSSteven Rostedt } 11094b80ffdSSteven Rostedt 11194b80ffdSSteven Rostedt void disable_branch_tracing(void) 11294b80ffdSSteven Rostedt { 11394b80ffdSSteven Rostedt mutex_lock(&branch_tracing_mutex); 11494b80ffdSSteven Rostedt 11594b80ffdSSteven Rostedt if (!branch_tracing_enabled) 11694b80ffdSSteven Rostedt goto out_unlock; 11794b80ffdSSteven Rostedt 11894b80ffdSSteven Rostedt branch_tracing_enabled--; 11994b80ffdSSteven Rostedt 12094b80ffdSSteven Rostedt out_unlock: 12194b80ffdSSteven Rostedt mutex_unlock(&branch_tracing_mutex); 12294b80ffdSSteven Rostedt } 12394b80ffdSSteven Rostedt 12494b80ffdSSteven Rostedt static void start_branch_trace(struct trace_array *tr) 12594b80ffdSSteven Rostedt { 12694b80ffdSSteven Rostedt enable_branch_tracing(tr); 12794b80ffdSSteven Rostedt } 12894b80ffdSSteven Rostedt 12994b80ffdSSteven Rostedt static void stop_branch_trace(struct trace_array *tr) 13094b80ffdSSteven Rostedt { 13194b80ffdSSteven Rostedt disable_branch_tracing(); 13294b80ffdSSteven Rostedt } 13394b80ffdSSteven Rostedt 1341c80025aSFrederic Weisbecker static int branch_trace_init(struct trace_array *tr) 13594b80ffdSSteven Rostedt { 13694b80ffdSSteven Rostedt start_branch_trace(tr); 1371c80025aSFrederic Weisbecker return 0; 13894b80ffdSSteven Rostedt } 13994b80ffdSSteven Rostedt 14094b80ffdSSteven Rostedt static void branch_trace_reset(struct trace_array *tr) 14194b80ffdSSteven Rostedt { 14294b80ffdSSteven Rostedt stop_branch_trace(tr); 14394b80ffdSSteven Rostedt } 14494b80ffdSSteven Rostedt 145ae7462b4SArnaldo Carvalho de Melo static enum print_line_t trace_branch_print(struct trace_iterator *iter, 146a9a57763SSteven Rostedt int flags, struct trace_event *event) 147f633cef0SSteven Rostedt { 148f633cef0SSteven Rostedt struct trace_branch *field; 149f633cef0SSteven Rostedt 1502c9b238eSArnaldo Carvalho de Melo trace_assign_type(field, iter->ent); 151f633cef0SSteven Rostedt 1522c9b238eSArnaldo Carvalho de Melo if (trace_seq_printf(&iter->seq, "[%s] %s:%s:%d\n", 153f633cef0SSteven Rostedt field->correct ? " ok " : " MISS ", 154f633cef0SSteven Rostedt field->func, 155f633cef0SSteven Rostedt field->file, 156f633cef0SSteven Rostedt field->line)) 157f633cef0SSteven Rostedt return TRACE_TYPE_PARTIAL_LINE; 158f633cef0SSteven Rostedt 159d9793bd8SArnaldo Carvalho de Melo return TRACE_TYPE_HANDLED; 160f633cef0SSteven Rostedt } 161f633cef0SSteven Rostedt 162557055beSZhaolei static void branch_print_header(struct seq_file *s) 163557055beSZhaolei { 164557055beSZhaolei seq_puts(s, "# TASK-PID CPU# TIMESTAMP CORRECT" 165557055beSZhaolei " FUNC:FILE:LINE\n"); 166557055beSZhaolei seq_puts(s, "# | | | | | " 167557055beSZhaolei " |\n"); 168557055beSZhaolei } 169e302cf3fSFrederic Weisbecker 170a9a57763SSteven Rostedt static struct trace_event_functions trace_branch_funcs = { 171a9a57763SSteven Rostedt .trace = trace_branch_print, 172a9a57763SSteven Rostedt }; 173a9a57763SSteven Rostedt 174f633cef0SSteven Rostedt static struct trace_event trace_branch_event = { 175f633cef0SSteven Rostedt .type = TRACE_BRANCH, 176a9a57763SSteven Rostedt .funcs = &trace_branch_funcs, 177f633cef0SSteven Rostedt }; 178f633cef0SSteven Rostedt 179002bb86dSFrederic Weisbecker static struct tracer branch_trace __read_mostly = 180002bb86dSFrederic Weisbecker { 181002bb86dSFrederic Weisbecker .name = "branch", 182002bb86dSFrederic Weisbecker .init = branch_trace_init, 183002bb86dSFrederic Weisbecker .reset = branch_trace_reset, 184002bb86dSFrederic Weisbecker #ifdef CONFIG_FTRACE_SELFTEST 185002bb86dSFrederic Weisbecker .selftest = trace_selftest_startup_branch, 186002bb86dSFrederic Weisbecker #endif /* CONFIG_FTRACE_SELFTEST */ 187557055beSZhaolei .print_header = branch_print_header, 188002bb86dSFrederic Weisbecker }; 189002bb86dSFrederic Weisbecker 190002bb86dSFrederic Weisbecker __init static int init_branch_tracer(void) 191002bb86dSFrederic Weisbecker { 192002bb86dSFrederic Weisbecker int ret; 193002bb86dSFrederic Weisbecker 194002bb86dSFrederic Weisbecker ret = register_ftrace_event(&trace_branch_event); 195002bb86dSFrederic Weisbecker if (!ret) { 196002bb86dSFrederic Weisbecker printk(KERN_WARNING "Warning: could not register " 197002bb86dSFrederic Weisbecker "branch events\n"); 198002bb86dSFrederic Weisbecker return 1; 199002bb86dSFrederic Weisbecker } 200002bb86dSFrederic Weisbecker return register_tracer(&branch_trace); 201002bb86dSFrederic Weisbecker } 2026f415672SSteven Rostedt core_initcall(init_branch_tracer); 203002bb86dSFrederic Weisbecker 20494b80ffdSSteven Rostedt #else 20594b80ffdSSteven Rostedt static inline 20694b80ffdSSteven Rostedt void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect) 20794b80ffdSSteven Rostedt { 20894b80ffdSSteven Rostedt } 20994b80ffdSSteven Rostedt #endif /* CONFIG_BRANCH_TRACER */ 21094b80ffdSSteven Rostedt 21194b80ffdSSteven Rostedt void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect) 21294b80ffdSSteven Rostedt { 21394b80ffdSSteven Rostedt /* 21494b80ffdSSteven Rostedt * I would love to have a trace point here instead, but the 21594b80ffdSSteven Rostedt * trace point code is so inundated with unlikely and likely 21694b80ffdSSteven Rostedt * conditions that the recursive nightmare that exists is too 21794b80ffdSSteven Rostedt * much to try to get working. At least for now. 21894b80ffdSSteven Rostedt */ 21994b80ffdSSteven Rostedt trace_likely_condition(f, val, expect); 22094b80ffdSSteven Rostedt 22194b80ffdSSteven Rostedt /* FIXME: Make this atomic! */ 22294b80ffdSSteven Rostedt if (val == expect) 22394b80ffdSSteven Rostedt f->correct++; 22494b80ffdSSteven Rostedt else 22594b80ffdSSteven Rostedt f->incorrect++; 22694b80ffdSSteven Rostedt } 22794b80ffdSSteven Rostedt EXPORT_SYMBOL(ftrace_likely_update); 22894b80ffdSSteven Rostedt 229e302cf3fSFrederic Weisbecker extern unsigned long __start_annotated_branch_profile[]; 230e302cf3fSFrederic Weisbecker extern unsigned long __stop_annotated_branch_profile[]; 23194b80ffdSSteven Rostedt 232e302cf3fSFrederic Weisbecker static int annotated_branch_stat_headers(struct seq_file *m) 23394b80ffdSSteven Rostedt { 2342bcd521aSSteven Rostedt seq_printf(m, " correct incorrect %% "); 2352bcd521aSSteven Rostedt seq_printf(m, " Function " 23694b80ffdSSteven Rostedt " File Line\n" 23794b80ffdSSteven Rostedt " ------- --------- - " 23894b80ffdSSteven Rostedt " -------- " 23994b80ffdSSteven Rostedt " ---- ----\n"); 24094b80ffdSSteven Rostedt return 0; 24194b80ffdSSteven Rostedt } 24294b80ffdSSteven Rostedt 243e302cf3fSFrederic Weisbecker static inline long get_incorrect_percent(struct ftrace_branch_data *p) 244e302cf3fSFrederic Weisbecker { 245e302cf3fSFrederic Weisbecker long percent; 246e302cf3fSFrederic Weisbecker 247e302cf3fSFrederic Weisbecker if (p->correct) { 248e302cf3fSFrederic Weisbecker percent = p->incorrect * 100; 249e302cf3fSFrederic Weisbecker percent /= p->correct + p->incorrect; 250e302cf3fSFrederic Weisbecker } else 251e302cf3fSFrederic Weisbecker percent = p->incorrect ? 100 : -1; 252e302cf3fSFrederic Weisbecker 253e302cf3fSFrederic Weisbecker return percent; 254e302cf3fSFrederic Weisbecker } 255e302cf3fSFrederic Weisbecker 256e302cf3fSFrederic Weisbecker static int branch_stat_show(struct seq_file *m, void *v) 257e302cf3fSFrederic Weisbecker { 258e302cf3fSFrederic Weisbecker struct ftrace_branch_data *p = v; 259e302cf3fSFrederic Weisbecker const char *f; 260e302cf3fSFrederic Weisbecker long percent; 261e302cf3fSFrederic Weisbecker 26294b80ffdSSteven Rostedt /* Only print the file, not the path */ 26394b80ffdSSteven Rostedt f = p->file + strlen(p->file); 26494b80ffdSSteven Rostedt while (f >= p->file && *f != '/') 26594b80ffdSSteven Rostedt f--; 26694b80ffdSSteven Rostedt f++; 26794b80ffdSSteven Rostedt 2682bcd521aSSteven Rostedt /* 2692bcd521aSSteven Rostedt * The miss is overlayed on correct, and hit on incorrect. 2702bcd521aSSteven Rostedt */ 271e302cf3fSFrederic Weisbecker percent = get_incorrect_percent(p); 27294b80ffdSSteven Rostedt 273bac28bfeSSteven Rostedt seq_printf(m, "%8lu %8lu ", p->correct, p->incorrect); 274bac28bfeSSteven Rostedt if (percent < 0) 275bac28bfeSSteven Rostedt seq_printf(m, " X "); 276bac28bfeSSteven Rostedt else 277bac28bfeSSteven Rostedt seq_printf(m, "%3ld ", percent); 27894b80ffdSSteven Rostedt seq_printf(m, "%-30.30s %-20.20s %d\n", p->func, f, p->line); 27994b80ffdSSteven Rostedt return 0; 28094b80ffdSSteven Rostedt } 28194b80ffdSSteven Rostedt 28242548008SSteven Rostedt static void *annotated_branch_stat_start(struct tracer_stat *trace) 28394b80ffdSSteven Rostedt { 284e302cf3fSFrederic Weisbecker return __start_annotated_branch_profile; 28594b80ffdSSteven Rostedt } 28694b80ffdSSteven Rostedt 287e302cf3fSFrederic Weisbecker static void * 288e302cf3fSFrederic Weisbecker annotated_branch_stat_next(void *v, int idx) 289e302cf3fSFrederic Weisbecker { 290e302cf3fSFrederic Weisbecker struct ftrace_branch_data *p = v; 291e302cf3fSFrederic Weisbecker 292e302cf3fSFrederic Weisbecker ++p; 293e302cf3fSFrederic Weisbecker 294e302cf3fSFrederic Weisbecker if ((void *)p >= (void *)__stop_annotated_branch_profile) 295e302cf3fSFrederic Weisbecker return NULL; 296e302cf3fSFrederic Weisbecker 297e302cf3fSFrederic Weisbecker return p; 29894b80ffdSSteven Rostedt } 29994b80ffdSSteven Rostedt 300e302cf3fSFrederic Weisbecker static int annotated_branch_stat_cmp(void *p1, void *p2) 30194b80ffdSSteven Rostedt { 302e302cf3fSFrederic Weisbecker struct ftrace_branch_data *a = p1; 303e302cf3fSFrederic Weisbecker struct ftrace_branch_data *b = p2; 30494b80ffdSSteven Rostedt 305e302cf3fSFrederic Weisbecker long percent_a, percent_b; 30694b80ffdSSteven Rostedt 307e302cf3fSFrederic Weisbecker percent_a = get_incorrect_percent(a); 308e302cf3fSFrederic Weisbecker percent_b = get_incorrect_percent(b); 30994b80ffdSSteven Rostedt 310e302cf3fSFrederic Weisbecker if (percent_a < percent_b) 311e302cf3fSFrederic Weisbecker return -1; 312e302cf3fSFrederic Weisbecker if (percent_a > percent_b) 313e302cf3fSFrederic Weisbecker return 1; 314ede55c9dSSteven Rostedt 315ede55c9dSSteven Rostedt if (a->incorrect < b->incorrect) 316ede55c9dSSteven Rostedt return -1; 317ede55c9dSSteven Rostedt if (a->incorrect > b->incorrect) 318ede55c9dSSteven Rostedt return 1; 319ede55c9dSSteven Rostedt 320ede55c9dSSteven Rostedt /* 321ede55c9dSSteven Rostedt * Since the above shows worse (incorrect) cases 322ede55c9dSSteven Rostedt * first, we continue that by showing best (correct) 323ede55c9dSSteven Rostedt * cases last. 324ede55c9dSSteven Rostedt */ 325ede55c9dSSteven Rostedt if (a->correct > b->correct) 326ede55c9dSSteven Rostedt return -1; 327ede55c9dSSteven Rostedt if (a->correct < b->correct) 328ede55c9dSSteven Rostedt return 1; 329ede55c9dSSteven Rostedt 33094b80ffdSSteven Rostedt return 0; 33194b80ffdSSteven Rostedt } 33294b80ffdSSteven Rostedt 333002bb86dSFrederic Weisbecker static struct tracer_stat annotated_branch_stats = { 334002bb86dSFrederic Weisbecker .name = "branch_annotated", 335002bb86dSFrederic Weisbecker .stat_start = annotated_branch_stat_start, 336002bb86dSFrederic Weisbecker .stat_next = annotated_branch_stat_next, 337002bb86dSFrederic Weisbecker .stat_cmp = annotated_branch_stat_cmp, 338002bb86dSFrederic Weisbecker .stat_headers = annotated_branch_stat_headers, 339002bb86dSFrederic Weisbecker .stat_show = branch_stat_show 340002bb86dSFrederic Weisbecker }; 341002bb86dSFrederic Weisbecker 342002bb86dSFrederic Weisbecker __init static int init_annotated_branch_stats(void) 343002bb86dSFrederic Weisbecker { 344002bb86dSFrederic Weisbecker int ret; 345002bb86dSFrederic Weisbecker 346002bb86dSFrederic Weisbecker ret = register_stat_tracer(&annotated_branch_stats); 347002bb86dSFrederic Weisbecker if (!ret) { 348002bb86dSFrederic Weisbecker printk(KERN_WARNING "Warning: could not register " 349002bb86dSFrederic Weisbecker "annotated branches stats\n"); 350002bb86dSFrederic Weisbecker return 1; 351002bb86dSFrederic Weisbecker } 352002bb86dSFrederic Weisbecker return 0; 353002bb86dSFrederic Weisbecker } 354002bb86dSFrederic Weisbecker fs_initcall(init_annotated_branch_stats); 355002bb86dSFrederic Weisbecker 356e302cf3fSFrederic Weisbecker #ifdef CONFIG_PROFILE_ALL_BRANCHES 357e302cf3fSFrederic Weisbecker 358e302cf3fSFrederic Weisbecker extern unsigned long __start_branch_profile[]; 359e302cf3fSFrederic Weisbecker extern unsigned long __stop_branch_profile[]; 360e302cf3fSFrederic Weisbecker 361e302cf3fSFrederic Weisbecker static int all_branch_stat_headers(struct seq_file *m) 362e302cf3fSFrederic Weisbecker { 363e302cf3fSFrederic Weisbecker seq_printf(m, " miss hit %% "); 364e302cf3fSFrederic Weisbecker seq_printf(m, " Function " 365e302cf3fSFrederic Weisbecker " File Line\n" 366e302cf3fSFrederic Weisbecker " ------- --------- - " 367e302cf3fSFrederic Weisbecker " -------- " 368e302cf3fSFrederic Weisbecker " ---- ----\n"); 369e302cf3fSFrederic Weisbecker return 0; 370e302cf3fSFrederic Weisbecker } 371e302cf3fSFrederic Weisbecker 37242548008SSteven Rostedt static void *all_branch_stat_start(struct tracer_stat *trace) 373e302cf3fSFrederic Weisbecker { 374e302cf3fSFrederic Weisbecker return __start_branch_profile; 375e302cf3fSFrederic Weisbecker } 376e302cf3fSFrederic Weisbecker 377e302cf3fSFrederic Weisbecker static void * 378e302cf3fSFrederic Weisbecker all_branch_stat_next(void *v, int idx) 379e302cf3fSFrederic Weisbecker { 380e302cf3fSFrederic Weisbecker struct ftrace_branch_data *p = v; 381e302cf3fSFrederic Weisbecker 382e302cf3fSFrederic Weisbecker ++p; 383e302cf3fSFrederic Weisbecker 384e302cf3fSFrederic Weisbecker if ((void *)p >= (void *)__stop_branch_profile) 385e302cf3fSFrederic Weisbecker return NULL; 386e302cf3fSFrederic Weisbecker 387e302cf3fSFrederic Weisbecker return p; 388e302cf3fSFrederic Weisbecker } 389e302cf3fSFrederic Weisbecker 390002bb86dSFrederic Weisbecker static struct tracer_stat all_branch_stats = { 391002bb86dSFrederic Weisbecker .name = "branch_all", 392034939b6SFrederic Weisbecker .stat_start = all_branch_stat_start, 393034939b6SFrederic Weisbecker .stat_next = all_branch_stat_next, 394034939b6SFrederic Weisbecker .stat_headers = all_branch_stat_headers, 395002bb86dSFrederic Weisbecker .stat_show = branch_stat_show 396034939b6SFrederic Weisbecker }; 397034939b6SFrederic Weisbecker 398002bb86dSFrederic Weisbecker __init static int all_annotated_branch_stats(void) 399e302cf3fSFrederic Weisbecker { 400e302cf3fSFrederic Weisbecker int ret; 401002bb86dSFrederic Weisbecker 402002bb86dSFrederic Weisbecker ret = register_stat_tracer(&all_branch_stats); 403e302cf3fSFrederic Weisbecker if (!ret) { 404002bb86dSFrederic Weisbecker printk(KERN_WARNING "Warning: could not register " 405002bb86dSFrederic Weisbecker "all branches stats\n"); 406e302cf3fSFrederic Weisbecker return 1; 407e302cf3fSFrederic Weisbecker } 408002bb86dSFrederic Weisbecker return 0; 409e302cf3fSFrederic Weisbecker } 410002bb86dSFrederic Weisbecker fs_initcall(all_annotated_branch_stats); 411002bb86dSFrederic Weisbecker #endif /* CONFIG_PROFILE_ALL_BRANCHES */ 412