Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ring buffer based function tracer |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally taken from the RT patch by: |
| 8 | * Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code from the latency_tracer, that is: |
| 11 | * Copyright (C) 2004-2006 Ingo Molnar |
| 12 | * Copyright (C) 2004 William Lee Irwin III |
| 13 | */ |
| 14 | #include <linux/utsrelease.h> |
| 15 | #include <linux/kallsyms.h> |
| 16 | #include <linux/seq_file.h> |
| 17 | #include <linux/debugfs.h> |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 18 | #include <linux/pagemap.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 19 | #include <linux/hardirq.h> |
| 20 | #include <linux/linkage.h> |
| 21 | #include <linux/uaccess.h> |
| 22 | #include <linux/ftrace.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/percpu.h> |
| 25 | #include <linux/ctype.h> |
| 26 | #include <linux/init.h> |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 27 | #include <linux/poll.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 28 | #include <linux/gfp.h> |
| 29 | #include <linux/fs.h> |
| 30 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 31 | #include <linux/stacktrace.h> |
| 32 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 33 | #include "trace.h" |
| 34 | |
| 35 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 36 | unsigned long __read_mostly tracing_thresh; |
| 37 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 38 | /* dummy trace to disable tracing */ |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 39 | static struct tracer no_tracer __read_mostly = { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 40 | .name = "none", |
| 41 | }; |
| 42 | |
| 43 | static int trace_alloc_page(void); |
| 44 | static int trace_free_page(void); |
| 45 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 46 | static int tracing_disabled = 1; |
| 47 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 48 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 49 | ns2usecs(cycle_t nsec) |
| 50 | { |
| 51 | nsec += 500; |
| 52 | do_div(nsec, 1000); |
| 53 | return nsec; |
| 54 | } |
| 55 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 56 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 57 | { |
Ingo Molnar | 0fd9e0d | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 58 | return cpu_clock(cpu); |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 59 | } |
| 60 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 61 | static struct trace_array global_trace; |
| 62 | |
| 63 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 64 | |
| 65 | static struct trace_array max_tr; |
| 66 | |
| 67 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 68 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 69 | static int tracer_enabled = 1; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 70 | static unsigned long trace_nr_entries = 65536UL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 71 | |
| 72 | static struct tracer *trace_types __read_mostly; |
| 73 | static struct tracer *current_trace __read_mostly; |
| 74 | static int max_tracer_type_len; |
| 75 | |
| 76 | static DEFINE_MUTEX(trace_types_lock); |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 77 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 78 | |
| 79 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 80 | |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 81 | void trace_wake_up(void) |
| 82 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 83 | /* |
| 84 | * The runqueue_is_locked() can fail, but this is the best we |
| 85 | * have for now: |
| 86 | */ |
| 87 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 88 | wake_up(&trace_wait); |
| 89 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 90 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 91 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
| 92 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 93 | static int __init set_nr_entries(char *str) |
| 94 | { |
| 95 | if (!str) |
| 96 | return 0; |
| 97 | trace_nr_entries = simple_strtoul(str, &str, 0); |
| 98 | return 1; |
| 99 | } |
| 100 | __setup("trace_entries=", set_nr_entries); |
| 101 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 102 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 103 | { |
| 104 | return nsecs / 1000; |
| 105 | } |
| 106 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 107 | enum trace_flag_type { |
| 108 | TRACE_FLAG_IRQS_OFF = 0x01, |
| 109 | TRACE_FLAG_NEED_RESCHED = 0x02, |
| 110 | TRACE_FLAG_HARDIRQ = 0x04, |
| 111 | TRACE_FLAG_SOFTIRQ = 0x08, |
| 112 | }; |
| 113 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 114 | #define TRACE_ITER_SYM_MASK \ |
| 115 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 116 | |
| 117 | /* These must match the bit postions above */ |
| 118 | static const char *trace_options[] = { |
| 119 | "print-parent", |
| 120 | "sym-offset", |
| 121 | "sym-addr", |
| 122 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 123 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 124 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 125 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 126 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 127 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 128 | "sched-tree", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 129 | NULL |
| 130 | }; |
| 131 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 132 | static raw_spinlock_t ftrace_max_lock = |
| 133 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * Copy the new maximum trace into the separate maximum-trace |
| 137 | * structure. (this way the maximum trace is permanently saved, |
| 138 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 139 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 140 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 141 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 142 | { |
| 143 | struct trace_array_cpu *data = tr->data[cpu]; |
| 144 | |
| 145 | max_tr.cpu = cpu; |
| 146 | max_tr.time_start = data->preempt_timestamp; |
| 147 | |
| 148 | data = max_tr.data[cpu]; |
| 149 | data->saved_latency = tracing_max_latency; |
| 150 | |
| 151 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 152 | data->pid = tsk->pid; |
| 153 | data->uid = tsk->uid; |
| 154 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 155 | data->policy = tsk->policy; |
| 156 | data->rt_priority = tsk->rt_priority; |
| 157 | |
| 158 | /* record this tasks comm */ |
| 159 | tracing_record_cmdline(current); |
| 160 | } |
| 161 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 162 | void check_pages(struct trace_array_cpu *data) |
| 163 | { |
| 164 | struct page *page, *tmp; |
| 165 | |
| 166 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); |
| 167 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); |
| 168 | |
| 169 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
| 170 | BUG_ON(page->lru.next->prev != &page->lru); |
| 171 | BUG_ON(page->lru.prev->next != &page->lru); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | void *head_page(struct trace_array_cpu *data) |
| 176 | { |
| 177 | struct page *page; |
| 178 | |
| 179 | check_pages(data); |
| 180 | if (list_empty(&data->trace_pages)) |
| 181 | return NULL; |
| 182 | |
| 183 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 184 | BUG_ON(&page->lru == &data->trace_pages); |
| 185 | |
| 186 | return page_address(page); |
| 187 | } |
| 188 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 189 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 190 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 191 | { |
| 192 | int len = (PAGE_SIZE - 1) - s->len; |
| 193 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 194 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 195 | |
| 196 | if (!len) |
| 197 | return 0; |
| 198 | |
| 199 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 200 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 201 | va_end(ap); |
| 202 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 203 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 204 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 205 | return 0; |
| 206 | |
| 207 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 208 | |
| 209 | return len; |
| 210 | } |
| 211 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 212 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 213 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 214 | { |
| 215 | int len = strlen(str); |
| 216 | |
| 217 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 218 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 219 | |
| 220 | memcpy(s->buffer + s->len, str, len); |
| 221 | s->len += len; |
| 222 | |
| 223 | return len; |
| 224 | } |
| 225 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 226 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 227 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 228 | { |
| 229 | if (s->len >= (PAGE_SIZE - 1)) |
| 230 | return 0; |
| 231 | |
| 232 | s->buffer[s->len++] = c; |
| 233 | |
| 234 | return 1; |
| 235 | } |
| 236 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 237 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 238 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 239 | { |
| 240 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 241 | return 0; |
| 242 | |
| 243 | memcpy(s->buffer + s->len, mem, len); |
| 244 | s->len += len; |
| 245 | |
| 246 | return len; |
| 247 | } |
| 248 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 249 | #define HEX_CHARS 17 |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 250 | static const char hex2asc[] = "0123456789abcdef"; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 251 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 252 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 253 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 254 | { |
| 255 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 256 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 257 | unsigned char byte; |
| 258 | int i, j; |
| 259 | |
| 260 | BUG_ON(len >= HEX_CHARS); |
| 261 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 262 | #ifdef __BIG_ENDIAN |
| 263 | for (i = 0, j = 0; i < len; i++) { |
| 264 | #else |
| 265 | for (i = len-1, j = 0; i >= 0; i--) { |
| 266 | #endif |
| 267 | byte = data[i]; |
| 268 | |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 269 | hex[j++] = hex2asc[byte & 0x0f]; |
| 270 | hex[j++] = hex2asc[byte >> 4]; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 271 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 272 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 273 | |
| 274 | return trace_seq_putmem(s, hex, j); |
| 275 | } |
| 276 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 277 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 278 | trace_seq_reset(struct trace_seq *s) |
| 279 | { |
| 280 | s->len = 0; |
| 281 | } |
| 282 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 283 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 284 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 285 | { |
| 286 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 287 | |
| 288 | s->buffer[len] = 0; |
| 289 | seq_puts(m, s->buffer); |
| 290 | |
| 291 | trace_seq_reset(s); |
| 292 | } |
| 293 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 294 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 295 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 296 | { |
| 297 | struct list_head flip_pages; |
| 298 | |
| 299 | INIT_LIST_HEAD(&flip_pages); |
| 300 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 301 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 302 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 303 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 304 | |
| 305 | check_pages(tr1); |
| 306 | check_pages(tr2); |
| 307 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 308 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 309 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 310 | BUG_ON(!list_empty(&flip_pages)); |
| 311 | check_pages(tr1); |
| 312 | check_pages(tr2); |
| 313 | } |
| 314 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 315 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 316 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 317 | { |
| 318 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 319 | int i; |
| 320 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 321 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 322 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 323 | /* clear out all the previous traces */ |
| 324 | for_each_possible_cpu(i) { |
| 325 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 326 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 327 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 331 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | /** |
| 335 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 336 | * @tr - tracer |
| 337 | * @tsk - task with the latency |
| 338 | * @cpu - the cpu of the buffer to copy. |
| 339 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 340 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 341 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 342 | { |
| 343 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 344 | int i; |
| 345 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 346 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 347 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 348 | for_each_possible_cpu(i) |
| 349 | tracing_reset(max_tr.data[i]); |
| 350 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 351 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 352 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 353 | |
| 354 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 355 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | int register_tracer(struct tracer *type) |
| 359 | { |
| 360 | struct tracer *t; |
| 361 | int len; |
| 362 | int ret = 0; |
| 363 | |
| 364 | if (!type->name) { |
| 365 | pr_info("Tracer must have a name\n"); |
| 366 | return -1; |
| 367 | } |
| 368 | |
| 369 | mutex_lock(&trace_types_lock); |
| 370 | for (t = trace_types; t; t = t->next) { |
| 371 | if (strcmp(type->name, t->name) == 0) { |
| 372 | /* already found */ |
| 373 | pr_info("Trace %s already registered\n", |
| 374 | type->name); |
| 375 | ret = -1; |
| 376 | goto out; |
| 377 | } |
| 378 | } |
| 379 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 380 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 381 | if (type->selftest) { |
| 382 | struct tracer *saved_tracer = current_trace; |
| 383 | struct trace_array_cpu *data; |
| 384 | struct trace_array *tr = &global_trace; |
| 385 | int saved_ctrl = tr->ctrl; |
| 386 | int i; |
| 387 | /* |
| 388 | * Run a selftest on this tracer. |
| 389 | * Here we reset the trace buffer, and set the current |
| 390 | * tracer to be this tracer. The tracer can then run some |
| 391 | * internal tracing to verify that everything is in order. |
| 392 | * If we fail, we do not register this tracer. |
| 393 | */ |
| 394 | for_each_possible_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 395 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 396 | if (!head_page(data)) |
| 397 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 398 | tracing_reset(data); |
| 399 | } |
| 400 | current_trace = type; |
| 401 | tr->ctrl = 0; |
| 402 | /* the test is responsible for initializing and enabling */ |
| 403 | pr_info("Testing tracer %s: ", type->name); |
| 404 | ret = type->selftest(type, tr); |
| 405 | /* the test is responsible for resetting too */ |
| 406 | current_trace = saved_tracer; |
| 407 | tr->ctrl = saved_ctrl; |
| 408 | if (ret) { |
| 409 | printk(KERN_CONT "FAILED!\n"); |
| 410 | goto out; |
| 411 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 412 | /* Only reset on passing, to avoid touching corrupted buffers */ |
| 413 | for_each_possible_cpu(i) { |
| 414 | data = tr->data[i]; |
| 415 | if (!head_page(data)) |
| 416 | continue; |
| 417 | tracing_reset(data); |
| 418 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 419 | printk(KERN_CONT "PASSED\n"); |
| 420 | } |
| 421 | #endif |
| 422 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 423 | type->next = trace_types; |
| 424 | trace_types = type; |
| 425 | len = strlen(type->name); |
| 426 | if (len > max_tracer_type_len) |
| 427 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 428 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 429 | out: |
| 430 | mutex_unlock(&trace_types_lock); |
| 431 | |
| 432 | return ret; |
| 433 | } |
| 434 | |
| 435 | void unregister_tracer(struct tracer *type) |
| 436 | { |
| 437 | struct tracer **t; |
| 438 | int len; |
| 439 | |
| 440 | mutex_lock(&trace_types_lock); |
| 441 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 442 | if (*t == type) |
| 443 | goto found; |
| 444 | } |
| 445 | pr_info("Trace %s not registered\n", type->name); |
| 446 | goto out; |
| 447 | |
| 448 | found: |
| 449 | *t = (*t)->next; |
| 450 | if (strlen(type->name) != max_tracer_type_len) |
| 451 | goto out; |
| 452 | |
| 453 | max_tracer_type_len = 0; |
| 454 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 455 | len = strlen((*t)->name); |
| 456 | if (len > max_tracer_type_len) |
| 457 | max_tracer_type_len = len; |
| 458 | } |
| 459 | out: |
| 460 | mutex_unlock(&trace_types_lock); |
| 461 | } |
| 462 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 463 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 464 | { |
| 465 | data->trace_idx = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 466 | data->trace_head = data->trace_tail = head_page(data); |
| 467 | data->trace_head_idx = 0; |
| 468 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 469 | } |
| 470 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 471 | #define SAVED_CMDLINES 128 |
| 472 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 473 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 474 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 475 | static int cmdline_idx; |
| 476 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
| 477 | atomic_t trace_record_cmdline_disabled; |
| 478 | |
| 479 | static void trace_init_cmdlines(void) |
| 480 | { |
| 481 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 482 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 483 | cmdline_idx = 0; |
| 484 | } |
| 485 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 486 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 487 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 488 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 489 | { |
| 490 | unsigned map; |
| 491 | unsigned idx; |
| 492 | |
| 493 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 494 | return; |
| 495 | |
| 496 | /* |
| 497 | * It's not the end of the world if we don't get |
| 498 | * the lock, but we also don't want to spin |
| 499 | * nor do we want to disable interrupts, |
| 500 | * so if we miss here, then better luck next time. |
| 501 | */ |
| 502 | if (!spin_trylock(&trace_cmdline_lock)) |
| 503 | return; |
| 504 | |
| 505 | idx = map_pid_to_cmdline[tsk->pid]; |
| 506 | if (idx >= SAVED_CMDLINES) { |
| 507 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 508 | |
| 509 | map = map_cmdline_to_pid[idx]; |
| 510 | if (map <= PID_MAX_DEFAULT) |
| 511 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 512 | |
| 513 | map_pid_to_cmdline[tsk->pid] = idx; |
| 514 | |
| 515 | cmdline_idx = idx; |
| 516 | } |
| 517 | |
| 518 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 519 | |
| 520 | spin_unlock(&trace_cmdline_lock); |
| 521 | } |
| 522 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 523 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 524 | { |
| 525 | char *cmdline = "<...>"; |
| 526 | unsigned map; |
| 527 | |
| 528 | if (!pid) |
| 529 | return "<idle>"; |
| 530 | |
| 531 | if (pid > PID_MAX_DEFAULT) |
| 532 | goto out; |
| 533 | |
| 534 | map = map_pid_to_cmdline[pid]; |
| 535 | if (map >= SAVED_CMDLINES) |
| 536 | goto out; |
| 537 | |
| 538 | cmdline = saved_cmdlines[map]; |
| 539 | |
| 540 | out: |
| 541 | return cmdline; |
| 542 | } |
| 543 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 544 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 545 | { |
| 546 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 547 | return; |
| 548 | |
| 549 | trace_save_cmdline(tsk); |
| 550 | } |
| 551 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 552 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 553 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 554 | { |
| 555 | /* |
| 556 | * Roundrobin - but skip the head (which is not a real page): |
| 557 | */ |
| 558 | next = next->next; |
| 559 | if (unlikely(next == &data->trace_pages)) |
| 560 | next = next->next; |
| 561 | BUG_ON(next == &data->trace_pages); |
| 562 | |
| 563 | return next; |
| 564 | } |
| 565 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 566 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 567 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 568 | { |
| 569 | struct list_head *next; |
| 570 | struct page *page; |
| 571 | |
| 572 | page = virt_to_page(addr); |
| 573 | |
| 574 | next = trace_next_list(data, &page->lru); |
| 575 | page = list_entry(next, struct page, lru); |
| 576 | |
| 577 | return page_address(page); |
| 578 | } |
| 579 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 580 | static inline struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 581 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 582 | { |
| 583 | unsigned long idx, idx_next; |
| 584 | struct trace_entry *entry; |
| 585 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 586 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 587 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 588 | idx_next = idx + 1; |
| 589 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 590 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 591 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 592 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 593 | |
| 594 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 595 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 596 | idx_next = 0; |
| 597 | } |
| 598 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 599 | if (data->trace_head == data->trace_tail && |
| 600 | idx_next == data->trace_tail_idx) { |
| 601 | /* overrun */ |
| 602 | data->trace_tail_idx++; |
| 603 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 604 | data->trace_tail = |
| 605 | trace_next_page(data, data->trace_tail); |
| 606 | data->trace_tail_idx = 0; |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 611 | |
| 612 | return entry; |
| 613 | } |
| 614 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 615 | static inline void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 616 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 617 | { |
| 618 | struct task_struct *tsk = current; |
| 619 | unsigned long pc; |
| 620 | |
| 621 | pc = preempt_count(); |
| 622 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 623 | entry->preempt_count = pc & 0xff; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 624 | entry->pid = (tsk) ? tsk->pid : 0; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 625 | entry->t = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 626 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
| 627 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 628 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 629 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 630 | } |
| 631 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 632 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 633 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 634 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 635 | { |
| 636 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 637 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 638 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 639 | raw_local_irq_save(irq_flags); |
| 640 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 641 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 642 | tracing_generic_entry_update(entry, flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 643 | entry->type = TRACE_FN; |
| 644 | entry->fn.ip = ip; |
| 645 | entry->fn.parent_ip = parent_ip; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 646 | __raw_spin_unlock(&data->lock); |
| 647 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 648 | } |
| 649 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 650 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 651 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 652 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 653 | { |
| 654 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 655 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 656 | } |
| 657 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 658 | void |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 659 | __trace_special(void *__tr, void *__data, |
| 660 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 661 | { |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 662 | struct trace_array_cpu *data = __data; |
| 663 | struct trace_array *tr = __tr; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 664 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 665 | unsigned long irq_flags; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 666 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 667 | raw_local_irq_save(irq_flags); |
| 668 | __raw_spin_lock(&data->lock); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 669 | entry = tracing_get_trace_entry(tr, data); |
| 670 | tracing_generic_entry_update(entry, 0); |
| 671 | entry->type = TRACE_SPECIAL; |
| 672 | entry->special.arg1 = arg1; |
| 673 | entry->special.arg2 = arg2; |
| 674 | entry->special.arg3 = arg3; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 675 | __raw_spin_unlock(&data->lock); |
| 676 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 677 | |
| 678 | trace_wake_up(); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 679 | } |
| 680 | |
| 681 | void __trace_stack(struct trace_array *tr, |
| 682 | struct trace_array_cpu *data, |
| 683 | unsigned long flags, |
| 684 | int skip) |
| 685 | { |
| 686 | struct trace_entry *entry; |
| 687 | struct stack_trace trace; |
| 688 | |
| 689 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 690 | return; |
| 691 | |
| 692 | entry = tracing_get_trace_entry(tr, data); |
| 693 | tracing_generic_entry_update(entry, flags); |
| 694 | entry->type = TRACE_STACK; |
| 695 | |
| 696 | memset(&entry->stack, 0, sizeof(entry->stack)); |
| 697 | |
| 698 | trace.nr_entries = 0; |
| 699 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 700 | trace.skip = skip; |
| 701 | trace.entries = entry->stack.caller; |
| 702 | |
| 703 | save_stack_trace(&trace); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 704 | } |
| 705 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 706 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 707 | tracing_sched_switch_trace(struct trace_array *tr, |
| 708 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 709 | struct task_struct *prev, |
| 710 | struct task_struct *next, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 711 | unsigned long flags) |
| 712 | { |
| 713 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 714 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 715 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 716 | raw_local_irq_save(irq_flags); |
| 717 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 718 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 719 | tracing_generic_entry_update(entry, flags); |
| 720 | entry->type = TRACE_CTX; |
| 721 | entry->ctx.prev_pid = prev->pid; |
| 722 | entry->ctx.prev_prio = prev->prio; |
| 723 | entry->ctx.prev_state = prev->state; |
| 724 | entry->ctx.next_pid = next->pid; |
| 725 | entry->ctx.next_prio = next->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 726 | entry->ctx.next_state = next->state; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 727 | __trace_stack(tr, data, flags, 4); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 728 | __raw_spin_unlock(&data->lock); |
| 729 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 730 | } |
| 731 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 732 | void |
| 733 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 734 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 735 | struct task_struct *wakee, |
| 736 | struct task_struct *curr, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 737 | unsigned long flags) |
| 738 | { |
| 739 | struct trace_entry *entry; |
| 740 | unsigned long irq_flags; |
| 741 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 742 | raw_local_irq_save(irq_flags); |
| 743 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 744 | entry = tracing_get_trace_entry(tr, data); |
| 745 | tracing_generic_entry_update(entry, flags); |
| 746 | entry->type = TRACE_WAKE; |
| 747 | entry->ctx.prev_pid = curr->pid; |
| 748 | entry->ctx.prev_prio = curr->prio; |
| 749 | entry->ctx.prev_state = curr->state; |
| 750 | entry->ctx.next_pid = wakee->pid; |
| 751 | entry->ctx.next_prio = wakee->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 752 | entry->ctx.next_state = wakee->state; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 753 | __trace_stack(tr, data, flags, 5); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 754 | __raw_spin_unlock(&data->lock); |
| 755 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 756 | |
| 757 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 758 | } |
| 759 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 760 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 761 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 762 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 763 | { |
| 764 | struct trace_array *tr = &global_trace; |
| 765 | struct trace_array_cpu *data; |
| 766 | unsigned long flags; |
| 767 | long disabled; |
| 768 | int cpu; |
| 769 | |
| 770 | if (unlikely(!tracer_enabled)) |
| 771 | return; |
| 772 | |
| 773 | local_irq_save(flags); |
| 774 | cpu = raw_smp_processor_id(); |
| 775 | data = tr->data[cpu]; |
| 776 | disabled = atomic_inc_return(&data->disabled); |
| 777 | |
| 778 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 779 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 780 | |
| 781 | atomic_dec(&data->disabled); |
| 782 | local_irq_restore(flags); |
| 783 | } |
| 784 | |
| 785 | static struct ftrace_ops trace_ops __read_mostly = |
| 786 | { |
| 787 | .func = function_trace_call, |
| 788 | }; |
| 789 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 790 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 791 | { |
| 792 | register_ftrace_function(&trace_ops); |
| 793 | } |
| 794 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 795 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 796 | { |
| 797 | unregister_ftrace_function(&trace_ops); |
| 798 | } |
| 799 | #endif |
| 800 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 801 | enum trace_file_type { |
| 802 | TRACE_FILE_LAT_FMT = 1, |
| 803 | }; |
| 804 | |
| 805 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 806 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 807 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 808 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 809 | struct page *page; |
| 810 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 811 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 812 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 813 | iter->next_idx[cpu] >= data->trace_idx || |
| 814 | (data->trace_head == data->trace_tail && |
| 815 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 816 | return NULL; |
| 817 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 818 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 819 | /* Initialize the iterator for this cpu trace buffer */ |
| 820 | WARN_ON(!data->trace_tail); |
| 821 | page = virt_to_page(data->trace_tail); |
| 822 | iter->next_page[cpu] = &page->lru; |
| 823 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 824 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 825 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 826 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 827 | BUG_ON(&data->trace_pages == &page->lru); |
| 828 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 829 | array = page_address(page); |
| 830 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 831 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 832 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 833 | } |
| 834 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 835 | static struct trace_entry * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 836 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
| 837 | { |
| 838 | struct trace_array *tr = iter->tr; |
| 839 | struct trace_entry *ent, *next = NULL; |
| 840 | int next_cpu = -1; |
| 841 | int cpu; |
| 842 | |
| 843 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 844 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 845 | continue; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 846 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 847 | /* |
| 848 | * Pick the entry with the smallest timestamp: |
| 849 | */ |
| 850 | if (ent && (!next || ent->t < next->t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 851 | next = ent; |
| 852 | next_cpu = cpu; |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | if (ent_cpu) |
| 857 | *ent_cpu = next_cpu; |
| 858 | |
| 859 | return next; |
| 860 | } |
| 861 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 862 | static void trace_iterator_increment(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 863 | { |
| 864 | iter->idx++; |
| 865 | iter->next_idx[iter->cpu]++; |
| 866 | iter->next_page_idx[iter->cpu]++; |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 867 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 868 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
| 869 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 870 | |
| 871 | iter->next_page_idx[iter->cpu] = 0; |
| 872 | iter->next_page[iter->cpu] = |
| 873 | trace_next_list(data, iter->next_page[iter->cpu]); |
| 874 | } |
| 875 | } |
| 876 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 877 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 878 | { |
| 879 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 880 | |
| 881 | data->trace_tail_idx++; |
| 882 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 883 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 884 | data->trace_tail_idx = 0; |
| 885 | } |
| 886 | |
| 887 | /* Check if we empty it, then reset the index */ |
| 888 | if (data->trace_head == data->trace_tail && |
| 889 | data->trace_head_idx == data->trace_tail_idx) |
| 890 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 891 | } |
| 892 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 893 | static void *find_next_entry_inc(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 894 | { |
| 895 | struct trace_entry *next; |
| 896 | int next_cpu = -1; |
| 897 | |
| 898 | next = find_next_entry(iter, &next_cpu); |
| 899 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 900 | iter->prev_ent = iter->ent; |
| 901 | iter->prev_cpu = iter->cpu; |
| 902 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 903 | iter->ent = next; |
| 904 | iter->cpu = next_cpu; |
| 905 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 906 | if (next) |
| 907 | trace_iterator_increment(iter); |
| 908 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 909 | return next ? iter : NULL; |
| 910 | } |
| 911 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 912 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 913 | { |
| 914 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 915 | void *last_ent = iter->ent; |
| 916 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 917 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 918 | |
| 919 | (*pos)++; |
| 920 | |
| 921 | /* can't go backwards */ |
| 922 | if (iter->idx > i) |
| 923 | return NULL; |
| 924 | |
| 925 | if (iter->idx < 0) |
| 926 | ent = find_next_entry_inc(iter); |
| 927 | else |
| 928 | ent = iter; |
| 929 | |
| 930 | while (ent && iter->idx < i) |
| 931 | ent = find_next_entry_inc(iter); |
| 932 | |
| 933 | iter->pos = *pos; |
| 934 | |
| 935 | if (last_ent && !ent) |
| 936 | seq_puts(m, "\n\nvim:ft=help\n"); |
| 937 | |
| 938 | return ent; |
| 939 | } |
| 940 | |
| 941 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 942 | { |
| 943 | struct trace_iterator *iter = m->private; |
| 944 | void *p = NULL; |
| 945 | loff_t l = 0; |
| 946 | int i; |
| 947 | |
| 948 | mutex_lock(&trace_types_lock); |
| 949 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 950 | if (!current_trace || current_trace != iter->trace) { |
| 951 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 952 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 953 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 954 | |
| 955 | atomic_inc(&trace_record_cmdline_disabled); |
| 956 | |
| 957 | /* let the tracer grab locks here if needed */ |
| 958 | if (current_trace->start) |
| 959 | current_trace->start(iter); |
| 960 | |
| 961 | if (*pos != iter->pos) { |
| 962 | iter->ent = NULL; |
| 963 | iter->cpu = 0; |
| 964 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 965 | iter->prev_ent = NULL; |
| 966 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 967 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 968 | for_each_possible_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 969 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 970 | iter->next_page[i] = NULL; |
| 971 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 972 | |
| 973 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 974 | ; |
| 975 | |
| 976 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 977 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 978 | p = s_next(m, p, &l); |
| 979 | } |
| 980 | |
| 981 | return p; |
| 982 | } |
| 983 | |
| 984 | static void s_stop(struct seq_file *m, void *p) |
| 985 | { |
| 986 | struct trace_iterator *iter = m->private; |
| 987 | |
| 988 | atomic_dec(&trace_record_cmdline_disabled); |
| 989 | |
| 990 | /* let the tracer release locks here if needed */ |
| 991 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 992 | iter->trace->stop(iter); |
| 993 | |
| 994 | mutex_unlock(&trace_types_lock); |
| 995 | } |
| 996 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 997 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 998 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 999 | { |
| 1000 | #ifdef CONFIG_KALLSYMS |
| 1001 | char str[KSYM_SYMBOL_LEN]; |
| 1002 | |
| 1003 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1004 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1005 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1006 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1007 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1008 | } |
| 1009 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1010 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1011 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1012 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1013 | { |
| 1014 | #ifdef CONFIG_KALLSYMS |
| 1015 | char str[KSYM_SYMBOL_LEN]; |
| 1016 | |
| 1017 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1018 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1019 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1020 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1021 | } |
| 1022 | |
| 1023 | #ifndef CONFIG_64BIT |
| 1024 | # define IP_FMT "%08lx" |
| 1025 | #else |
| 1026 | # define IP_FMT "%016lx" |
| 1027 | #endif |
| 1028 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1029 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1030 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1031 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1032 | int ret; |
| 1033 | |
| 1034 | if (!ip) |
| 1035 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1036 | |
| 1037 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1038 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1039 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1040 | ret = seq_print_sym_short(s, "%s", ip); |
| 1041 | |
| 1042 | if (!ret) |
| 1043 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1044 | |
| 1045 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1046 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1047 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1048 | } |
| 1049 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1050 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1051 | { |
| 1052 | seq_puts(m, "# _------=> CPU# \n"); |
| 1053 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1054 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1055 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1056 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1057 | seq_puts(m, "# |||| / \n"); |
| 1058 | seq_puts(m, "# ||||| delay \n"); |
| 1059 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1060 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
| 1061 | } |
| 1062 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1063 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1064 | { |
| 1065 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1066 | seq_puts(m, "# | | | | |\n"); |
| 1067 | } |
| 1068 | |
| 1069 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1070 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1071 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1072 | { |
| 1073 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1074 | struct trace_array *tr = iter->tr; |
| 1075 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1076 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1077 | unsigned long total = 0; |
| 1078 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1079 | int cpu; |
| 1080 | const char *name = "preemption"; |
| 1081 | |
| 1082 | if (type) |
| 1083 | name = type->name; |
| 1084 | |
| 1085 | for_each_possible_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1086 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1087 | total += tr->data[cpu]->trace_idx; |
| 1088 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1089 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1090 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1091 | entries += tr->data[cpu]->trace_idx; |
| 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1096 | name, UTS_RELEASE); |
| 1097 | seq_puts(m, "-----------------------------------" |
| 1098 | "---------------------------------\n"); |
| 1099 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1100 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1101 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1102 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1103 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1104 | tr->cpu, |
| 1105 | #if defined(CONFIG_PREEMPT_NONE) |
| 1106 | "server", |
| 1107 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1108 | "desktop", |
| 1109 | #elif defined(CONFIG_PREEMPT_DESKTOP) |
| 1110 | "preempt", |
| 1111 | #else |
| 1112 | "unknown", |
| 1113 | #endif |
| 1114 | /* These are reserved for later use */ |
| 1115 | 0, 0, 0, 0); |
| 1116 | #ifdef CONFIG_SMP |
| 1117 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1118 | #else |
| 1119 | seq_puts(m, ")\n"); |
| 1120 | #endif |
| 1121 | seq_puts(m, " -----------------\n"); |
| 1122 | seq_printf(m, " | task: %.16s-%d " |
| 1123 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1124 | data->comm, data->pid, data->uid, data->nice, |
| 1125 | data->policy, data->rt_priority); |
| 1126 | seq_puts(m, " -----------------\n"); |
| 1127 | |
| 1128 | if (data->critical_start) { |
| 1129 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1130 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1131 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1132 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1133 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1134 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1135 | seq_puts(m, "\n"); |
| 1136 | } |
| 1137 | |
| 1138 | seq_puts(m, "\n"); |
| 1139 | } |
| 1140 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1141 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1142 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1143 | { |
| 1144 | int hardirq, softirq; |
| 1145 | char *comm; |
| 1146 | |
| 1147 | comm = trace_find_cmdline(entry->pid); |
| 1148 | |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1149 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
| 1150 | trace_seq_printf(s, "%d", cpu); |
| 1151 | trace_seq_printf(s, "%c%c", |
| 1152 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1153 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1154 | |
| 1155 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1156 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1157 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1158 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1159 | } else { |
| 1160 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1161 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1162 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1163 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1164 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1165 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1166 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | if (entry->preempt_count) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1171 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1172 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1173 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1174 | } |
| 1175 | |
| 1176 | unsigned long preempt_mark_thresh = 100; |
| 1177 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1178 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1179 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1180 | unsigned long rel_usecs) |
| 1181 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1182 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1183 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1184 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1185 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1186 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1187 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1188 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1189 | } |
| 1190 | |
| 1191 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1192 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1193 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1194 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1195 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1196 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1197 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1198 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1199 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1200 | struct trace_entry *entry = iter->ent; |
| 1201 | unsigned long abs_usecs; |
| 1202 | unsigned long rel_usecs; |
| 1203 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1204 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1205 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1206 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1207 | |
| 1208 | if (!next_entry) |
| 1209 | next_entry = entry; |
| 1210 | rel_usecs = ns2usecs(next_entry->t - entry->t); |
| 1211 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); |
| 1212 | |
| 1213 | if (verbose) { |
| 1214 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1215 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
| 1216 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1217 | comm, |
| 1218 | entry->pid, cpu, entry->flags, |
| 1219 | entry->preempt_count, trace_idx, |
| 1220 | ns2usecs(entry->t), |
| 1221 | abs_usecs/1000, |
| 1222 | abs_usecs % 1000, rel_usecs/1000, |
| 1223 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1224 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1225 | lat_print_generic(s, entry, cpu); |
| 1226 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1227 | } |
| 1228 | switch (entry->type) { |
| 1229 | case TRACE_FN: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1230 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1231 | trace_seq_puts(s, " ("); |
| 1232 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); |
| 1233 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1234 | break; |
| 1235 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1236 | case TRACE_WAKE: |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1237 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1238 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1239 | |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1240 | state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0; |
| 1241 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1242 | comm = trace_find_cmdline(entry->ctx.next_pid); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1243 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1244 | entry->ctx.prev_pid, |
| 1245 | entry->ctx.prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1246 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1247 | entry->ctx.next_pid, |
| 1248 | entry->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1249 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1250 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1251 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1252 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1253 | entry->special.arg1, |
| 1254 | entry->special.arg2, |
| 1255 | entry->special.arg3); |
| 1256 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1257 | case TRACE_STACK: |
| 1258 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1259 | if (i) |
| 1260 | trace_seq_puts(s, " <= "); |
| 1261 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); |
| 1262 | } |
| 1263 | trace_seq_puts(s, "\n"); |
| 1264 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1265 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1266 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1267 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1268 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1269 | } |
| 1270 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1271 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1272 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1273 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1274 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1275 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1276 | unsigned long usec_rem; |
| 1277 | unsigned long long t; |
| 1278 | unsigned long secs; |
| 1279 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1280 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1281 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1282 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1283 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1284 | entry = iter->ent; |
| 1285 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1286 | comm = trace_find_cmdline(iter->ent->pid); |
| 1287 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1288 | t = ns2usecs(entry->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1289 | usec_rem = do_div(t, 1000000ULL); |
| 1290 | secs = (unsigned long)t; |
| 1291 | |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1292 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
| 1293 | if (!ret) |
| 1294 | return 0; |
| 1295 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); |
| 1296 | if (!ret) |
| 1297 | return 0; |
| 1298 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1299 | if (!ret) |
| 1300 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1301 | |
| 1302 | switch (entry->type) { |
| 1303 | case TRACE_FN: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1304 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1305 | if (!ret) |
| 1306 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1307 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
| 1308 | entry->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1309 | ret = trace_seq_printf(s, " <-"); |
| 1310 | if (!ret) |
| 1311 | return 0; |
| 1312 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, |
| 1313 | sym_flags); |
| 1314 | if (!ret) |
| 1315 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1316 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1317 | ret = trace_seq_printf(s, "\n"); |
| 1318 | if (!ret) |
| 1319 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1320 | break; |
| 1321 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1322 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1323 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1324 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1325 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1326 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1327 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1328 | entry->ctx.prev_pid, |
| 1329 | entry->ctx.prev_prio, |
| 1330 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1331 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1332 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1333 | entry->ctx.next_prio, |
| 1334 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1335 | if (!ret) |
| 1336 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1337 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1338 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1339 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1340 | entry->special.arg1, |
| 1341 | entry->special.arg2, |
| 1342 | entry->special.arg3); |
| 1343 | if (!ret) |
| 1344 | return 0; |
| 1345 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1346 | case TRACE_STACK: |
| 1347 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1348 | if (i) { |
| 1349 | ret = trace_seq_puts(s, " <= "); |
| 1350 | if (!ret) |
| 1351 | return 0; |
| 1352 | } |
| 1353 | ret = seq_print_ip_sym(s, entry->stack.caller[i], |
| 1354 | sym_flags); |
| 1355 | if (!ret) |
| 1356 | return 0; |
| 1357 | } |
| 1358 | ret = trace_seq_puts(s, "\n"); |
| 1359 | if (!ret) |
| 1360 | return 0; |
| 1361 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1362 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1363 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1364 | } |
| 1365 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1366 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1367 | { |
| 1368 | struct trace_seq *s = &iter->seq; |
| 1369 | struct trace_entry *entry; |
| 1370 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1371 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1372 | |
| 1373 | entry = iter->ent; |
| 1374 | |
| 1375 | ret = trace_seq_printf(s, "%d %d %llu ", |
| 1376 | entry->pid, iter->cpu, entry->t); |
| 1377 | if (!ret) |
| 1378 | return 0; |
| 1379 | |
| 1380 | switch (entry->type) { |
| 1381 | case TRACE_FN: |
| 1382 | ret = trace_seq_printf(s, "%x %x\n", |
| 1383 | entry->fn.ip, entry->fn.parent_ip); |
| 1384 | if (!ret) |
| 1385 | return 0; |
| 1386 | break; |
| 1387 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1388 | case TRACE_WAKE: |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1389 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1390 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1391 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1392 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1393 | if (entry->type == TRACE_WAKE) |
| 1394 | S = '+'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1395 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1396 | entry->ctx.prev_pid, |
| 1397 | entry->ctx.prev_prio, |
| 1398 | S, |
| 1399 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1400 | entry->ctx.next_prio, |
| 1401 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1402 | if (!ret) |
| 1403 | return 0; |
| 1404 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1405 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1406 | case TRACE_STACK: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1407 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1408 | entry->special.arg1, |
| 1409 | entry->special.arg2, |
| 1410 | entry->special.arg3); |
| 1411 | if (!ret) |
| 1412 | return 0; |
| 1413 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1414 | } |
| 1415 | return 1; |
| 1416 | } |
| 1417 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1418 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1419 | do { \ |
| 1420 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1421 | return 0; \ |
| 1422 | } while (0) |
| 1423 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1424 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1425 | do { \ |
| 1426 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1427 | return 0; \ |
| 1428 | } while (0) |
| 1429 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1430 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1431 | { |
| 1432 | struct trace_seq *s = &iter->seq; |
| 1433 | unsigned char newline = '\n'; |
| 1434 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1435 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1436 | |
| 1437 | entry = iter->ent; |
| 1438 | |
| 1439 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
| 1440 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
| 1441 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); |
| 1442 | |
| 1443 | switch (entry->type) { |
| 1444 | case TRACE_FN: |
| 1445 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); |
| 1446 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1447 | break; |
| 1448 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1449 | case TRACE_WAKE: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1450 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1451 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1452 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1453 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1454 | if (entry->type == TRACE_WAKE) |
| 1455 | S = '+'; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1456 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
| 1457 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); |
| 1458 | SEQ_PUT_HEX_FIELD_RET(s, S); |
| 1459 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); |
| 1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); |
| 1461 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1462 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1463 | break; |
| 1464 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1465 | case TRACE_STACK: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1466 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
| 1467 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); |
| 1468 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); |
| 1469 | break; |
| 1470 | } |
| 1471 | SEQ_PUT_FIELD_RET(s, newline); |
| 1472 | |
| 1473 | return 1; |
| 1474 | } |
| 1475 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1476 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1477 | { |
| 1478 | struct trace_seq *s = &iter->seq; |
| 1479 | struct trace_entry *entry; |
| 1480 | |
| 1481 | entry = iter->ent; |
| 1482 | |
| 1483 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1484 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
| 1485 | SEQ_PUT_FIELD_RET(s, entry->t); |
| 1486 | |
| 1487 | switch (entry->type) { |
| 1488 | case TRACE_FN: |
| 1489 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); |
| 1490 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); |
| 1491 | break; |
| 1492 | case TRACE_CTX: |
| 1493 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); |
| 1494 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); |
| 1495 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); |
| 1496 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); |
| 1497 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1498 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1499 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1500 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1501 | case TRACE_STACK: |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1502 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
| 1503 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); |
| 1504 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); |
| 1505 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1506 | } |
| 1507 | return 1; |
| 1508 | } |
| 1509 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1510 | static int trace_empty(struct trace_iterator *iter) |
| 1511 | { |
| 1512 | struct trace_array_cpu *data; |
| 1513 | int cpu; |
| 1514 | |
| 1515 | for_each_possible_cpu(cpu) { |
| 1516 | data = iter->tr->data[cpu]; |
| 1517 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1518 | if (head_page(data) && data->trace_idx && |
| 1519 | (data->trace_tail != data->trace_head || |
| 1520 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1521 | return 0; |
| 1522 | } |
| 1523 | return 1; |
| 1524 | } |
| 1525 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1526 | static int print_trace_line(struct trace_iterator *iter) |
| 1527 | { |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1528 | if (iter->trace && iter->trace->print_line) |
| 1529 | return iter->trace->print_line(iter); |
| 1530 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1531 | if (trace_flags & TRACE_ITER_BIN) |
| 1532 | return print_bin_fmt(iter); |
| 1533 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1534 | if (trace_flags & TRACE_ITER_HEX) |
| 1535 | return print_hex_fmt(iter); |
| 1536 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1537 | if (trace_flags & TRACE_ITER_RAW) |
| 1538 | return print_raw_fmt(iter); |
| 1539 | |
| 1540 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1541 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1542 | |
| 1543 | return print_trace_fmt(iter); |
| 1544 | } |
| 1545 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1546 | static int s_show(struct seq_file *m, void *v) |
| 1547 | { |
| 1548 | struct trace_iterator *iter = v; |
| 1549 | |
| 1550 | if (iter->ent == NULL) { |
| 1551 | if (iter->tr) { |
| 1552 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1553 | seq_puts(m, "#\n"); |
| 1554 | } |
| 1555 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1556 | /* print nothing if the buffers are empty */ |
| 1557 | if (trace_empty(iter)) |
| 1558 | return 0; |
| 1559 | print_trace_header(m, iter); |
| 1560 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1561 | print_lat_help_header(m); |
| 1562 | } else { |
| 1563 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1564 | print_func_help_header(m); |
| 1565 | } |
| 1566 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1567 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1568 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1569 | } |
| 1570 | |
| 1571 | return 0; |
| 1572 | } |
| 1573 | |
| 1574 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1575 | .start = s_start, |
| 1576 | .next = s_next, |
| 1577 | .stop = s_stop, |
| 1578 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1579 | }; |
| 1580 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1581 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1582 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1583 | { |
| 1584 | struct trace_iterator *iter; |
| 1585 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1586 | if (tracing_disabled) { |
| 1587 | *ret = -ENODEV; |
| 1588 | return NULL; |
| 1589 | } |
| 1590 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1591 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1592 | if (!iter) { |
| 1593 | *ret = -ENOMEM; |
| 1594 | goto out; |
| 1595 | } |
| 1596 | |
| 1597 | mutex_lock(&trace_types_lock); |
| 1598 | if (current_trace && current_trace->print_max) |
| 1599 | iter->tr = &max_tr; |
| 1600 | else |
| 1601 | iter->tr = inode->i_private; |
| 1602 | iter->trace = current_trace; |
| 1603 | iter->pos = -1; |
| 1604 | |
| 1605 | /* TODO stop tracer */ |
| 1606 | *ret = seq_open(file, &tracer_seq_ops); |
| 1607 | if (!*ret) { |
| 1608 | struct seq_file *m = file->private_data; |
| 1609 | m->private = iter; |
| 1610 | |
| 1611 | /* stop the trace while dumping */ |
| 1612 | if (iter->tr->ctrl) |
| 1613 | tracer_enabled = 0; |
| 1614 | |
| 1615 | if (iter->trace && iter->trace->open) |
| 1616 | iter->trace->open(iter); |
| 1617 | } else { |
| 1618 | kfree(iter); |
| 1619 | iter = NULL; |
| 1620 | } |
| 1621 | mutex_unlock(&trace_types_lock); |
| 1622 | |
| 1623 | out: |
| 1624 | return iter; |
| 1625 | } |
| 1626 | |
| 1627 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1628 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1629 | if (tracing_disabled) |
| 1630 | return -ENODEV; |
| 1631 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1632 | filp->private_data = inode->i_private; |
| 1633 | return 0; |
| 1634 | } |
| 1635 | |
| 1636 | int tracing_release(struct inode *inode, struct file *file) |
| 1637 | { |
| 1638 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1639 | struct trace_iterator *iter = m->private; |
| 1640 | |
| 1641 | mutex_lock(&trace_types_lock); |
| 1642 | if (iter->trace && iter->trace->close) |
| 1643 | iter->trace->close(iter); |
| 1644 | |
| 1645 | /* reenable tracing if it was previously enabled */ |
| 1646 | if (iter->tr->ctrl) |
| 1647 | tracer_enabled = 1; |
| 1648 | mutex_unlock(&trace_types_lock); |
| 1649 | |
| 1650 | seq_release(inode, file); |
| 1651 | kfree(iter); |
| 1652 | return 0; |
| 1653 | } |
| 1654 | |
| 1655 | static int tracing_open(struct inode *inode, struct file *file) |
| 1656 | { |
| 1657 | int ret; |
| 1658 | |
| 1659 | __tracing_open(inode, file, &ret); |
| 1660 | |
| 1661 | return ret; |
| 1662 | } |
| 1663 | |
| 1664 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1665 | { |
| 1666 | struct trace_iterator *iter; |
| 1667 | int ret; |
| 1668 | |
| 1669 | iter = __tracing_open(inode, file, &ret); |
| 1670 | |
| 1671 | if (!ret) |
| 1672 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1673 | |
| 1674 | return ret; |
| 1675 | } |
| 1676 | |
| 1677 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1678 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1679 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 1680 | { |
| 1681 | struct tracer *t = m->private; |
| 1682 | |
| 1683 | (*pos)++; |
| 1684 | |
| 1685 | if (t) |
| 1686 | t = t->next; |
| 1687 | |
| 1688 | m->private = t; |
| 1689 | |
| 1690 | return t; |
| 1691 | } |
| 1692 | |
| 1693 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 1694 | { |
| 1695 | struct tracer *t = m->private; |
| 1696 | loff_t l = 0; |
| 1697 | |
| 1698 | mutex_lock(&trace_types_lock); |
| 1699 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 1700 | ; |
| 1701 | |
| 1702 | return t; |
| 1703 | } |
| 1704 | |
| 1705 | static void t_stop(struct seq_file *m, void *p) |
| 1706 | { |
| 1707 | mutex_unlock(&trace_types_lock); |
| 1708 | } |
| 1709 | |
| 1710 | static int t_show(struct seq_file *m, void *v) |
| 1711 | { |
| 1712 | struct tracer *t = v; |
| 1713 | |
| 1714 | if (!t) |
| 1715 | return 0; |
| 1716 | |
| 1717 | seq_printf(m, "%s", t->name); |
| 1718 | if (t->next) |
| 1719 | seq_putc(m, ' '); |
| 1720 | else |
| 1721 | seq_putc(m, '\n'); |
| 1722 | |
| 1723 | return 0; |
| 1724 | } |
| 1725 | |
| 1726 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1727 | .start = t_start, |
| 1728 | .next = t_next, |
| 1729 | .stop = t_stop, |
| 1730 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1731 | }; |
| 1732 | |
| 1733 | static int show_traces_open(struct inode *inode, struct file *file) |
| 1734 | { |
| 1735 | int ret; |
| 1736 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1737 | if (tracing_disabled) |
| 1738 | return -ENODEV; |
| 1739 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1740 | ret = seq_open(file, &show_traces_seq_ops); |
| 1741 | if (!ret) { |
| 1742 | struct seq_file *m = file->private_data; |
| 1743 | m->private = trace_types; |
| 1744 | } |
| 1745 | |
| 1746 | return ret; |
| 1747 | } |
| 1748 | |
| 1749 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1750 | .open = tracing_open, |
| 1751 | .read = seq_read, |
| 1752 | .llseek = seq_lseek, |
| 1753 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1754 | }; |
| 1755 | |
| 1756 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1757 | .open = tracing_lt_open, |
| 1758 | .read = seq_read, |
| 1759 | .llseek = seq_lseek, |
| 1760 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1761 | }; |
| 1762 | |
| 1763 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1764 | .open = show_traces_open, |
| 1765 | .read = seq_read, |
| 1766 | .release = seq_release, |
| 1767 | }; |
| 1768 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1769 | /* |
| 1770 | * Only trace on a CPU if the bitmask is set: |
| 1771 | */ |
| 1772 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 1773 | |
| 1774 | /* |
| 1775 | * When tracing/tracing_cpu_mask is modified then this holds |
| 1776 | * the new bitmask we are about to install: |
| 1777 | */ |
| 1778 | static cpumask_t tracing_cpumask_new; |
| 1779 | |
| 1780 | /* |
| 1781 | * The tracer itself will not take this lock, but still we want |
| 1782 | * to provide a consistent cpumask to user-space: |
| 1783 | */ |
| 1784 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 1785 | |
| 1786 | /* |
| 1787 | * Temporary storage for the character representation of the |
| 1788 | * CPU bitmask (and one more byte for the newline): |
| 1789 | */ |
| 1790 | static char mask_str[NR_CPUS + 1]; |
| 1791 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1792 | static ssize_t |
| 1793 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 1794 | size_t count, loff_t *ppos) |
| 1795 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1796 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1797 | |
| 1798 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1799 | |
| 1800 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 1801 | if (count - len < 2) { |
| 1802 | count = -EINVAL; |
| 1803 | goto out_err; |
| 1804 | } |
| 1805 | len += sprintf(mask_str + len, "\n"); |
| 1806 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 1807 | |
| 1808 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1809 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1810 | |
| 1811 | return count; |
| 1812 | } |
| 1813 | |
| 1814 | static ssize_t |
| 1815 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 1816 | size_t count, loff_t *ppos) |
| 1817 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1818 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1819 | |
| 1820 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1821 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 1822 | if (err) |
| 1823 | goto err_unlock; |
| 1824 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 1825 | raw_local_irq_disable(); |
| 1826 | __raw_spin_lock(&ftrace_max_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1827 | for_each_possible_cpu(cpu) { |
| 1828 | /* |
| 1829 | * Increase/decrease the disabled counter if we are |
| 1830 | * about to flip a bit in the cpumask: |
| 1831 | */ |
| 1832 | if (cpu_isset(cpu, tracing_cpumask) && |
| 1833 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 1834 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 1835 | } |
| 1836 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 1837 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 1838 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 1839 | } |
| 1840 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 1841 | __raw_spin_unlock(&ftrace_max_lock); |
| 1842 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1843 | |
| 1844 | tracing_cpumask = tracing_cpumask_new; |
| 1845 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1846 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1847 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1848 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1849 | |
| 1850 | err_unlock: |
| 1851 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1852 | |
| 1853 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1854 | } |
| 1855 | |
| 1856 | static struct file_operations tracing_cpumask_fops = { |
| 1857 | .open = tracing_open_generic, |
| 1858 | .read = tracing_cpumask_read, |
| 1859 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1860 | }; |
| 1861 | |
| 1862 | static ssize_t |
| 1863 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 1864 | size_t cnt, loff_t *ppos) |
| 1865 | { |
| 1866 | char *buf; |
| 1867 | int r = 0; |
| 1868 | int len = 0; |
| 1869 | int i; |
| 1870 | |
| 1871 | /* calulate max size */ |
| 1872 | for (i = 0; trace_options[i]; i++) { |
| 1873 | len += strlen(trace_options[i]); |
| 1874 | len += 3; /* "no" and space */ |
| 1875 | } |
| 1876 | |
| 1877 | /* +2 for \n and \0 */ |
| 1878 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 1879 | if (!buf) |
| 1880 | return -ENOMEM; |
| 1881 | |
| 1882 | for (i = 0; trace_options[i]; i++) { |
| 1883 | if (trace_flags & (1 << i)) |
| 1884 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 1885 | else |
| 1886 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 1887 | } |
| 1888 | |
| 1889 | r += sprintf(buf + r, "\n"); |
| 1890 | WARN_ON(r >= len + 2); |
| 1891 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1892 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1893 | |
| 1894 | kfree(buf); |
| 1895 | |
| 1896 | return r; |
| 1897 | } |
| 1898 | |
| 1899 | static ssize_t |
| 1900 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1901 | size_t cnt, loff_t *ppos) |
| 1902 | { |
| 1903 | char buf[64]; |
| 1904 | char *cmp = buf; |
| 1905 | int neg = 0; |
| 1906 | int i; |
| 1907 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 1908 | if (cnt >= sizeof(buf)) |
| 1909 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1910 | |
| 1911 | if (copy_from_user(&buf, ubuf, cnt)) |
| 1912 | return -EFAULT; |
| 1913 | |
| 1914 | buf[cnt] = 0; |
| 1915 | |
| 1916 | if (strncmp(buf, "no", 2) == 0) { |
| 1917 | neg = 1; |
| 1918 | cmp += 2; |
| 1919 | } |
| 1920 | |
| 1921 | for (i = 0; trace_options[i]; i++) { |
| 1922 | int len = strlen(trace_options[i]); |
| 1923 | |
| 1924 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 1925 | if (neg) |
| 1926 | trace_flags &= ~(1 << i); |
| 1927 | else |
| 1928 | trace_flags |= (1 << i); |
| 1929 | break; |
| 1930 | } |
| 1931 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1932 | /* |
| 1933 | * If no option could be set, return an error: |
| 1934 | */ |
| 1935 | if (!trace_options[i]) |
| 1936 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1937 | |
| 1938 | filp->f_pos += cnt; |
| 1939 | |
| 1940 | return cnt; |
| 1941 | } |
| 1942 | |
| 1943 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1944 | .open = tracing_open_generic, |
| 1945 | .read = tracing_iter_ctrl_read, |
| 1946 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1947 | }; |
| 1948 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1949 | static const char readme_msg[] = |
| 1950 | "tracing mini-HOWTO:\n\n" |
| 1951 | "# mkdir /debug\n" |
| 1952 | "# mount -t debugfs nodev /debug\n\n" |
| 1953 | "# cat /debug/tracing/available_tracers\n" |
| 1954 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 1955 | "# cat /debug/tracing/current_tracer\n" |
| 1956 | "none\n" |
| 1957 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 1958 | "# cat /debug/tracing/current_tracer\n" |
| 1959 | "sched_switch\n" |
| 1960 | "# cat /debug/tracing/iter_ctrl\n" |
| 1961 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 1962 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 1963 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 1964 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 1965 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 1966 | ; |
| 1967 | |
| 1968 | static ssize_t |
| 1969 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 1970 | size_t cnt, loff_t *ppos) |
| 1971 | { |
| 1972 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 1973 | readme_msg, strlen(readme_msg)); |
| 1974 | } |
| 1975 | |
| 1976 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1977 | .open = tracing_open_generic, |
| 1978 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1979 | }; |
| 1980 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1981 | static ssize_t |
| 1982 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 1983 | size_t cnt, loff_t *ppos) |
| 1984 | { |
| 1985 | struct trace_array *tr = filp->private_data; |
| 1986 | char buf[64]; |
| 1987 | int r; |
| 1988 | |
| 1989 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1990 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1991 | } |
| 1992 | |
| 1993 | static ssize_t |
| 1994 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 1995 | size_t cnt, loff_t *ppos) |
| 1996 | { |
| 1997 | struct trace_array *tr = filp->private_data; |
| 1998 | long val; |
| 1999 | char buf[64]; |
| 2000 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 2001 | if (cnt >= sizeof(buf)) |
| 2002 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2003 | |
| 2004 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2005 | return -EFAULT; |
| 2006 | |
| 2007 | buf[cnt] = 0; |
| 2008 | |
| 2009 | val = simple_strtoul(buf, NULL, 10); |
| 2010 | |
| 2011 | val = !!val; |
| 2012 | |
| 2013 | mutex_lock(&trace_types_lock); |
| 2014 | if (tr->ctrl ^ val) { |
| 2015 | if (val) |
| 2016 | tracer_enabled = 1; |
| 2017 | else |
| 2018 | tracer_enabled = 0; |
| 2019 | |
| 2020 | tr->ctrl = val; |
| 2021 | |
| 2022 | if (current_trace && current_trace->ctrl_update) |
| 2023 | current_trace->ctrl_update(tr); |
| 2024 | } |
| 2025 | mutex_unlock(&trace_types_lock); |
| 2026 | |
| 2027 | filp->f_pos += cnt; |
| 2028 | |
| 2029 | return cnt; |
| 2030 | } |
| 2031 | |
| 2032 | static ssize_t |
| 2033 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2034 | size_t cnt, loff_t *ppos) |
| 2035 | { |
| 2036 | char buf[max_tracer_type_len+2]; |
| 2037 | int r; |
| 2038 | |
| 2039 | mutex_lock(&trace_types_lock); |
| 2040 | if (current_trace) |
| 2041 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2042 | else |
| 2043 | r = sprintf(buf, "\n"); |
| 2044 | mutex_unlock(&trace_types_lock); |
| 2045 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2046 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2047 | } |
| 2048 | |
| 2049 | static ssize_t |
| 2050 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2051 | size_t cnt, loff_t *ppos) |
| 2052 | { |
| 2053 | struct trace_array *tr = &global_trace; |
| 2054 | struct tracer *t; |
| 2055 | char buf[max_tracer_type_len+1]; |
| 2056 | int i; |
| 2057 | |
| 2058 | if (cnt > max_tracer_type_len) |
| 2059 | cnt = max_tracer_type_len; |
| 2060 | |
| 2061 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2062 | return -EFAULT; |
| 2063 | |
| 2064 | buf[cnt] = 0; |
| 2065 | |
| 2066 | /* strip ending whitespace. */ |
| 2067 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2068 | buf[i] = 0; |
| 2069 | |
| 2070 | mutex_lock(&trace_types_lock); |
| 2071 | for (t = trace_types; t; t = t->next) { |
| 2072 | if (strcmp(t->name, buf) == 0) |
| 2073 | break; |
| 2074 | } |
| 2075 | if (!t || t == current_trace) |
| 2076 | goto out; |
| 2077 | |
| 2078 | if (current_trace && current_trace->reset) |
| 2079 | current_trace->reset(tr); |
| 2080 | |
| 2081 | current_trace = t; |
| 2082 | if (t->init) |
| 2083 | t->init(tr); |
| 2084 | |
| 2085 | out: |
| 2086 | mutex_unlock(&trace_types_lock); |
| 2087 | |
| 2088 | filp->f_pos += cnt; |
| 2089 | |
| 2090 | return cnt; |
| 2091 | } |
| 2092 | |
| 2093 | static ssize_t |
| 2094 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2095 | size_t cnt, loff_t *ppos) |
| 2096 | { |
| 2097 | unsigned long *ptr = filp->private_data; |
| 2098 | char buf[64]; |
| 2099 | int r; |
| 2100 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 2101 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2102 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 2103 | if (r > sizeof(buf)) |
| 2104 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2105 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2106 | } |
| 2107 | |
| 2108 | static ssize_t |
| 2109 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2110 | size_t cnt, loff_t *ppos) |
| 2111 | { |
| 2112 | long *ptr = filp->private_data; |
| 2113 | long val; |
| 2114 | char buf[64]; |
| 2115 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 2116 | if (cnt >= sizeof(buf)) |
| 2117 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2118 | |
| 2119 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2120 | return -EFAULT; |
| 2121 | |
| 2122 | buf[cnt] = 0; |
| 2123 | |
| 2124 | val = simple_strtoul(buf, NULL, 10); |
| 2125 | |
| 2126 | *ptr = val * 1000; |
| 2127 | |
| 2128 | return cnt; |
| 2129 | } |
| 2130 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2131 | static atomic_t tracing_reader; |
| 2132 | |
| 2133 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2134 | { |
| 2135 | struct trace_iterator *iter; |
| 2136 | |
| 2137 | if (tracing_disabled) |
| 2138 | return -ENODEV; |
| 2139 | |
| 2140 | /* We only allow for reader of the pipe */ |
| 2141 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2142 | atomic_dec(&tracing_reader); |
| 2143 | return -EBUSY; |
| 2144 | } |
| 2145 | |
| 2146 | /* create a buffer to store the information to pass to userspace */ |
| 2147 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2148 | if (!iter) |
| 2149 | return -ENOMEM; |
| 2150 | |
| 2151 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2152 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2153 | |
| 2154 | filp->private_data = iter; |
| 2155 | |
| 2156 | return 0; |
| 2157 | } |
| 2158 | |
| 2159 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2160 | { |
| 2161 | struct trace_iterator *iter = file->private_data; |
| 2162 | |
| 2163 | kfree(iter); |
| 2164 | atomic_dec(&tracing_reader); |
| 2165 | |
| 2166 | return 0; |
| 2167 | } |
| 2168 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2169 | static unsigned int |
| 2170 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2171 | { |
| 2172 | struct trace_iterator *iter = filp->private_data; |
| 2173 | |
| 2174 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2175 | /* |
| 2176 | * Always select as readable when in blocking mode |
| 2177 | */ |
| 2178 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2179 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2180 | if (!trace_empty(iter)) |
| 2181 | return POLLIN | POLLRDNORM; |
| 2182 | poll_wait(filp, &trace_wait, poll_table); |
| 2183 | if (!trace_empty(iter)) |
| 2184 | return POLLIN | POLLRDNORM; |
| 2185 | |
| 2186 | return 0; |
| 2187 | } |
| 2188 | } |
| 2189 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2190 | /* |
| 2191 | * Consumer reader. |
| 2192 | */ |
| 2193 | static ssize_t |
| 2194 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2195 | size_t cnt, loff_t *ppos) |
| 2196 | { |
| 2197 | struct trace_iterator *iter = filp->private_data; |
| 2198 | struct trace_array_cpu *data; |
Steven Rostedt | b5685ae | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2199 | struct trace_array *tr = iter->tr; |
| 2200 | struct tracer *tracer = iter->trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2201 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2202 | static int start; |
| 2203 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2204 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2205 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2206 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2207 | int read = 0; |
| 2208 | int cpu; |
| 2209 | int len; |
| 2210 | int ret; |
| 2211 | |
| 2212 | /* return any leftover data */ |
| 2213 | if (iter->seq.len > start) { |
| 2214 | len = iter->seq.len - start; |
| 2215 | if (cnt > len) |
| 2216 | cnt = len; |
| 2217 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); |
| 2218 | if (ret) |
| 2219 | cnt = -EFAULT; |
| 2220 | |
| 2221 | start += len; |
| 2222 | |
| 2223 | return cnt; |
| 2224 | } |
| 2225 | |
| 2226 | trace_seq_reset(&iter->seq); |
| 2227 | start = 0; |
| 2228 | |
| 2229 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2230 | |
| 2231 | if ((filp->f_flags & O_NONBLOCK)) |
| 2232 | return -EAGAIN; |
| 2233 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2234 | /* |
| 2235 | * This is a make-shift waitqueue. The reason we don't use |
| 2236 | * an actual wait queue is because: |
| 2237 | * 1) we only ever have one waiter |
| 2238 | * 2) the tracing, traces all functions, we don't want |
| 2239 | * the overhead of calling wake_up and friends |
| 2240 | * (and tracing them too) |
| 2241 | * Anyway, this is really very primitive wakeup. |
| 2242 | */ |
| 2243 | set_current_state(TASK_INTERRUPTIBLE); |
| 2244 | iter->tr->waiter = current; |
| 2245 | |
| 2246 | /* sleep for one second, and try again. */ |
| 2247 | schedule_timeout(HZ); |
| 2248 | |
| 2249 | iter->tr->waiter = NULL; |
| 2250 | |
| 2251 | if (signal_pending(current)) |
| 2252 | return -EINTR; |
| 2253 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2254 | if (iter->trace != current_trace) |
| 2255 | return 0; |
| 2256 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2257 | /* |
| 2258 | * We block until we read something and tracing is disabled. |
| 2259 | * We still block if tracing is disabled, but we have never |
| 2260 | * read anything. This allows a user to cat this file, and |
| 2261 | * then enable tracing. But after we have read something, |
| 2262 | * we give an EOF when tracing is again disabled. |
| 2263 | * |
| 2264 | * iter->pos will be 0 if we haven't read anything. |
| 2265 | */ |
| 2266 | if (!tracer_enabled && iter->pos) |
| 2267 | break; |
| 2268 | |
| 2269 | continue; |
| 2270 | } |
| 2271 | |
| 2272 | /* stop when tracing is finished */ |
| 2273 | if (trace_empty(iter)) |
| 2274 | return 0; |
| 2275 | |
| 2276 | if (cnt >= PAGE_SIZE) |
| 2277 | cnt = PAGE_SIZE - 1; |
| 2278 | |
| 2279 | memset(iter, 0, sizeof(*iter)); |
Steven Rostedt | b5685ae | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2280 | iter->tr = tr; |
| 2281 | iter->trace = tracer; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2282 | iter->pos = -1; |
| 2283 | |
| 2284 | /* |
| 2285 | * We need to stop all tracing on all CPUS to read the |
| 2286 | * the next buffer. This is a bit expensive, but is |
| 2287 | * not done often. We fill all what we can read, |
| 2288 | * and then release the locks again. |
| 2289 | */ |
| 2290 | |
| 2291 | cpus_clear(mask); |
| 2292 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2293 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2294 | ftrace_save = ftrace_enabled; |
| 2295 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2296 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2297 | smp_wmb(); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2298 | for_each_possible_cpu(cpu) { |
| 2299 | data = iter->tr->data[cpu]; |
| 2300 | |
| 2301 | if (!head_page(data) || !data->trace_idx) |
| 2302 | continue; |
| 2303 | |
| 2304 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2305 | cpu_set(cpu, mask); |
| 2306 | } |
| 2307 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2308 | for_each_cpu_mask(cpu, mask) { |
| 2309 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2310 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2311 | } |
| 2312 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2313 | while (find_next_entry_inc(iter) != NULL) { |
| 2314 | int len = iter->seq.len; |
| 2315 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2316 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2317 | if (!ret) { |
| 2318 | /* don't print partial lines */ |
| 2319 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2320 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2321 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2322 | |
| 2323 | trace_consume(iter); |
| 2324 | |
| 2325 | if (iter->seq.len >= cnt) |
| 2326 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2327 | } |
| 2328 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2329 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2330 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2331 | __raw_spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2332 | } |
| 2333 | |
| 2334 | for_each_cpu_mask(cpu, mask) { |
| 2335 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2336 | atomic_dec(&data->disabled); |
| 2337 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2338 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2339 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2340 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2341 | local_irq_restore(flags); |
| 2342 | |
| 2343 | /* Now copy what we have to the user */ |
| 2344 | read = iter->seq.len; |
| 2345 | if (read > cnt) |
| 2346 | read = cnt; |
| 2347 | |
| 2348 | ret = copy_to_user(ubuf, iter->seq.buffer, read); |
| 2349 | |
| 2350 | if (read < iter->seq.len) |
| 2351 | start = read; |
| 2352 | else |
| 2353 | trace_seq_reset(&iter->seq); |
| 2354 | |
| 2355 | if (ret) |
| 2356 | read = -EFAULT; |
| 2357 | |
| 2358 | return read; |
| 2359 | } |
| 2360 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2361 | static ssize_t |
| 2362 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2363 | size_t cnt, loff_t *ppos) |
| 2364 | { |
| 2365 | struct trace_array *tr = filp->private_data; |
| 2366 | char buf[64]; |
| 2367 | int r; |
| 2368 | |
| 2369 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2370 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2371 | } |
| 2372 | |
| 2373 | static ssize_t |
| 2374 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2375 | size_t cnt, loff_t *ppos) |
| 2376 | { |
| 2377 | unsigned long val; |
| 2378 | char buf[64]; |
| 2379 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame^] | 2380 | if (cnt >= sizeof(buf)) |
| 2381 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2382 | |
| 2383 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2384 | return -EFAULT; |
| 2385 | |
| 2386 | buf[cnt] = 0; |
| 2387 | |
| 2388 | val = simple_strtoul(buf, NULL, 10); |
| 2389 | |
| 2390 | /* must have at least 1 entry */ |
| 2391 | if (!val) |
| 2392 | return -EINVAL; |
| 2393 | |
| 2394 | mutex_lock(&trace_types_lock); |
| 2395 | |
| 2396 | if (current_trace != &no_tracer) { |
| 2397 | cnt = -EBUSY; |
| 2398 | pr_info("ftrace: set current_tracer to none" |
| 2399 | " before modifying buffer size\n"); |
| 2400 | goto out; |
| 2401 | } |
| 2402 | |
| 2403 | if (val > global_trace.entries) { |
| 2404 | while (global_trace.entries < val) { |
| 2405 | if (trace_alloc_page()) { |
| 2406 | cnt = -ENOMEM; |
| 2407 | goto out; |
| 2408 | } |
| 2409 | } |
| 2410 | } else { |
| 2411 | /* include the number of entries in val (inc of page entries) */ |
| 2412 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) |
| 2413 | trace_free_page(); |
| 2414 | } |
| 2415 | |
| 2416 | filp->f_pos += cnt; |
| 2417 | |
| 2418 | out: |
| 2419 | max_tr.entries = global_trace.entries; |
| 2420 | mutex_unlock(&trace_types_lock); |
| 2421 | |
| 2422 | return cnt; |
| 2423 | } |
| 2424 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2425 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2426 | .open = tracing_open_generic, |
| 2427 | .read = tracing_max_lat_read, |
| 2428 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2429 | }; |
| 2430 | |
| 2431 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2432 | .open = tracing_open_generic, |
| 2433 | .read = tracing_ctrl_read, |
| 2434 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2435 | }; |
| 2436 | |
| 2437 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2438 | .open = tracing_open_generic, |
| 2439 | .read = tracing_set_trace_read, |
| 2440 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2441 | }; |
| 2442 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2443 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2444 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2445 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2446 | .read = tracing_read_pipe, |
| 2447 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2448 | }; |
| 2449 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2450 | static struct file_operations tracing_entries_fops = { |
| 2451 | .open = tracing_open_generic, |
| 2452 | .read = tracing_entries_read, |
| 2453 | .write = tracing_entries_write, |
| 2454 | }; |
| 2455 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2456 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2457 | |
| 2458 | static ssize_t |
| 2459 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2460 | size_t cnt, loff_t *ppos) |
| 2461 | { |
| 2462 | unsigned long *p = filp->private_data; |
| 2463 | char buf[64]; |
| 2464 | int r; |
| 2465 | |
| 2466 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2467 | |
| 2468 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2469 | } |
| 2470 | |
| 2471 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2472 | .open = tracing_open_generic, |
| 2473 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2474 | }; |
| 2475 | #endif |
| 2476 | |
| 2477 | static struct dentry *d_tracer; |
| 2478 | |
| 2479 | struct dentry *tracing_init_dentry(void) |
| 2480 | { |
| 2481 | static int once; |
| 2482 | |
| 2483 | if (d_tracer) |
| 2484 | return d_tracer; |
| 2485 | |
| 2486 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2487 | |
| 2488 | if (!d_tracer && !once) { |
| 2489 | once = 1; |
| 2490 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2491 | return NULL; |
| 2492 | } |
| 2493 | |
| 2494 | return d_tracer; |
| 2495 | } |
| 2496 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2497 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2498 | /* Let selftest have access to static functions in this file */ |
| 2499 | #include "trace_selftest.c" |
| 2500 | #endif |
| 2501 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2502 | static __init void tracer_init_debugfs(void) |
| 2503 | { |
| 2504 | struct dentry *d_tracer; |
| 2505 | struct dentry *entry; |
| 2506 | |
| 2507 | d_tracer = tracing_init_dentry(); |
| 2508 | |
| 2509 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2510 | &global_trace, &tracing_ctrl_fops); |
| 2511 | if (!entry) |
| 2512 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2513 | |
| 2514 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2515 | NULL, &tracing_iter_fops); |
| 2516 | if (!entry) |
| 2517 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2518 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2519 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 2520 | NULL, &tracing_cpumask_fops); |
| 2521 | if (!entry) |
| 2522 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 2523 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2524 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2525 | &global_trace, &tracing_lt_fops); |
| 2526 | if (!entry) |
| 2527 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2528 | |
| 2529 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2530 | &global_trace, &tracing_fops); |
| 2531 | if (!entry) |
| 2532 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2533 | |
| 2534 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2535 | &global_trace, &show_traces_fops); |
| 2536 | if (!entry) |
| 2537 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2538 | |
| 2539 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2540 | &global_trace, &set_tracer_fops); |
| 2541 | if (!entry) |
| 2542 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2543 | |
| 2544 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2545 | &tracing_max_latency, |
| 2546 | &tracing_max_lat_fops); |
| 2547 | if (!entry) |
| 2548 | pr_warning("Could not create debugfs " |
| 2549 | "'tracing_max_latency' entry\n"); |
| 2550 | |
| 2551 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2552 | &tracing_thresh, &tracing_max_lat_fops); |
| 2553 | if (!entry) |
| 2554 | pr_warning("Could not create debugfs " |
| 2555 | "'tracing_threash' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2556 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2557 | NULL, &tracing_readme_fops); |
| 2558 | if (!entry) |
| 2559 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2560 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2561 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2562 | NULL, &tracing_pipe_fops); |
| 2563 | if (!entry) |
| 2564 | pr_warning("Could not create debugfs " |
| 2565 | "'tracing_threash' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2566 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2567 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 2568 | &global_trace, &tracing_entries_fops); |
| 2569 | if (!entry) |
| 2570 | pr_warning("Could not create debugfs " |
| 2571 | "'tracing_threash' entry\n"); |
| 2572 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2573 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2574 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2575 | &ftrace_update_tot_cnt, |
| 2576 | &tracing_read_long_fops); |
| 2577 | if (!entry) |
| 2578 | pr_warning("Could not create debugfs " |
| 2579 | "'dyn_ftrace_total_info' entry\n"); |
| 2580 | #endif |
| 2581 | } |
| 2582 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2583 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2584 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2585 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2586 | struct page *page, *tmp; |
| 2587 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2588 | void *array; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2589 | int i; |
| 2590 | |
| 2591 | /* first allocate a page for each CPU */ |
| 2592 | for_each_possible_cpu(i) { |
| 2593 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2594 | if (array == NULL) { |
| 2595 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2596 | "for trace buffer!\n"); |
| 2597 | goto free_pages; |
| 2598 | } |
| 2599 | |
| 2600 | page = virt_to_page(array); |
| 2601 | list_add(&page->lru, &pages); |
| 2602 | |
| 2603 | /* Only allocate if we are actually using the max trace */ |
| 2604 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2605 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2606 | if (array == NULL) { |
| 2607 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2608 | "for trace buffer!\n"); |
| 2609 | goto free_pages; |
| 2610 | } |
| 2611 | page = virt_to_page(array); |
| 2612 | list_add(&page->lru, &pages); |
| 2613 | #endif |
| 2614 | } |
| 2615 | |
| 2616 | /* Now that we successfully allocate a page per CPU, add them */ |
| 2617 | for_each_possible_cpu(i) { |
| 2618 | data = global_trace.data[i]; |
| 2619 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2620 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2621 | list_add_tail(&page->lru, &data->trace_pages); |
| 2622 | ClearPageLRU(page); |
| 2623 | |
| 2624 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2625 | data = max_tr.data[i]; |
| 2626 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2627 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2628 | list_add_tail(&page->lru, &data->trace_pages); |
| 2629 | SetPageLRU(page); |
| 2630 | #endif |
| 2631 | } |
| 2632 | global_trace.entries += ENTRIES_PER_PAGE; |
| 2633 | |
| 2634 | return 0; |
| 2635 | |
| 2636 | free_pages: |
| 2637 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2638 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2639 | __free_page(page); |
| 2640 | } |
| 2641 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2642 | } |
| 2643 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2644 | static int trace_free_page(void) |
| 2645 | { |
| 2646 | struct trace_array_cpu *data; |
| 2647 | struct page *page; |
| 2648 | struct list_head *p; |
| 2649 | int i; |
| 2650 | int ret = 0; |
| 2651 | |
| 2652 | /* free one page from each buffer */ |
| 2653 | for_each_possible_cpu(i) { |
| 2654 | data = global_trace.data[i]; |
| 2655 | p = data->trace_pages.next; |
| 2656 | if (p == &data->trace_pages) { |
| 2657 | /* should never happen */ |
| 2658 | WARN_ON(1); |
| 2659 | tracing_disabled = 1; |
| 2660 | ret = -1; |
| 2661 | break; |
| 2662 | } |
| 2663 | page = list_entry(p, struct page, lru); |
| 2664 | ClearPageLRU(page); |
| 2665 | list_del(&page->lru); |
| 2666 | __free_page(page); |
| 2667 | |
| 2668 | tracing_reset(data); |
| 2669 | |
| 2670 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2671 | data = max_tr.data[i]; |
| 2672 | p = data->trace_pages.next; |
| 2673 | if (p == &data->trace_pages) { |
| 2674 | /* should never happen */ |
| 2675 | WARN_ON(1); |
| 2676 | tracing_disabled = 1; |
| 2677 | ret = -1; |
| 2678 | break; |
| 2679 | } |
| 2680 | page = list_entry(p, struct page, lru); |
| 2681 | ClearPageLRU(page); |
| 2682 | list_del(&page->lru); |
| 2683 | __free_page(page); |
| 2684 | |
| 2685 | tracing_reset(data); |
| 2686 | #endif |
| 2687 | } |
| 2688 | global_trace.entries -= ENTRIES_PER_PAGE; |
| 2689 | |
| 2690 | return ret; |
| 2691 | } |
| 2692 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2693 | __init static int tracer_alloc_buffers(void) |
| 2694 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2695 | struct trace_array_cpu *data; |
| 2696 | void *array; |
| 2697 | struct page *page; |
| 2698 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2699 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2700 | int i; |
| 2701 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2702 | global_trace.ctrl = tracer_enabled; |
| 2703 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2704 | /* Allocate the first page for all buffers */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2705 | for_each_possible_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2706 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2707 | max_tr.data[i] = &per_cpu(max_data, i); |
| 2708 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2709 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2710 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2711 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2712 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2713 | goto free_buffers; |
| 2714 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2715 | |
| 2716 | /* set the array to the list */ |
| 2717 | INIT_LIST_HEAD(&data->trace_pages); |
| 2718 | page = virt_to_page(array); |
| 2719 | list_add(&page->lru, &data->trace_pages); |
| 2720 | /* use the LRU flag to differentiate the two buffers */ |
| 2721 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2722 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2723 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 2724 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 2725 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2726 | /* Only allocate if we are actually using the max trace */ |
| 2727 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2728 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2729 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2730 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2731 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2732 | goto free_buffers; |
| 2733 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2734 | |
| 2735 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 2736 | page = virt_to_page(array); |
| 2737 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 2738 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2739 | #endif |
| 2740 | } |
| 2741 | |
| 2742 | /* |
| 2743 | * Since we allocate by orders of pages, we may be able to |
| 2744 | * round up a bit. |
| 2745 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2746 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2747 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2748 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2749 | while (global_trace.entries < trace_nr_entries) { |
| 2750 | if (trace_alloc_page()) |
| 2751 | break; |
| 2752 | pages++; |
| 2753 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2754 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2755 | |
| 2756 | pr_info("tracer: %d pages allocated for %ld", |
| 2757 | pages, trace_nr_entries); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2758 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
| 2759 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 2760 | |
| 2761 | tracer_init_debugfs(); |
| 2762 | |
| 2763 | trace_init_cmdlines(); |
| 2764 | |
| 2765 | register_tracer(&no_tracer); |
| 2766 | current_trace = &no_tracer; |
| 2767 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2768 | /* All seems OK, enable tracing */ |
| 2769 | tracing_disabled = 0; |
| 2770 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2771 | return 0; |
| 2772 | |
| 2773 | free_buffers: |
| 2774 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2775 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2776 | struct trace_array_cpu *data = global_trace.data[i]; |
| 2777 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2778 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2779 | list_for_each_entry_safe(page, tmp, |
| 2780 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2781 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2782 | __free_page(page); |
| 2783 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2784 | } |
| 2785 | |
| 2786 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2787 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2788 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2789 | list_for_each_entry_safe(page, tmp, |
| 2790 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2791 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2792 | __free_page(page); |
| 2793 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2794 | } |
| 2795 | #endif |
| 2796 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2797 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2798 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2799 | fs_initcall(tracer_alloc_buffers); |