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> |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 30 | #include <linux/writeback.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 31 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 32 | #include <linux/stacktrace.h> |
| 33 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | #include "trace.h" |
| 35 | |
| 36 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 37 | unsigned long __read_mostly tracing_thresh; |
| 38 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 39 | static unsigned long __read_mostly tracing_nr_buffers; |
| 40 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 41 | |
| 42 | #define for_each_tracing_cpu(cpu) \ |
| 43 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 44 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 45 | /* dummy trace to disable tracing */ |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 46 | static struct tracer no_tracer __read_mostly = { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 47 | .name = "none", |
| 48 | }; |
| 49 | |
| 50 | static int trace_alloc_page(void); |
| 51 | static int trace_free_page(void); |
| 52 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 53 | static int tracing_disabled = 1; |
| 54 | |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 55 | static unsigned long tracing_pages_allocated; |
| 56 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 57 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 58 | ns2usecs(cycle_t nsec) |
| 59 | { |
| 60 | nsec += 500; |
| 61 | do_div(nsec, 1000); |
| 62 | return nsec; |
| 63 | } |
| 64 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 65 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 66 | { |
Ingo Molnar | 0fd9e0d | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 67 | return cpu_clock(cpu); |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 68 | } |
| 69 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 70 | /* |
| 71 | * The global_trace is the descriptor that holds the tracing |
| 72 | * buffers for the live tracing. For each CPU, it contains |
| 73 | * a link list of pages that will store trace entries. The |
| 74 | * page descriptor of the pages in the memory is used to hold |
| 75 | * the link list by linking the lru item in the page descriptor |
| 76 | * to each of the pages in the buffer per CPU. |
| 77 | * |
| 78 | * For each active CPU there is a data field that holds the |
| 79 | * pages for the buffer for that CPU. Each CPU has the same number |
| 80 | * of pages allocated for its buffer. |
| 81 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 82 | static struct trace_array global_trace; |
| 83 | |
| 84 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 85 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 86 | /* |
| 87 | * The max_tr is used to snapshot the global_trace when a maximum |
| 88 | * latency is reached. Some tracers will use this to store a maximum |
| 89 | * trace while it continues examining live traces. |
| 90 | * |
| 91 | * The buffers for the max_tr are set up the same as the global_trace. |
| 92 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 93 | * with the link list of the global_trace and the buffers are reset for |
| 94 | * the global_trace so the tracing can continue. |
| 95 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 96 | static struct trace_array max_tr; |
| 97 | |
| 98 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 99 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 100 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 101 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 102 | |
| 103 | /* |
| 104 | * trace_nr_entries is the number of entries that is allocated |
| 105 | * for a buffer. Note, the number of entries is always rounded |
| 106 | * to ENTRIES_PER_PAGE. |
| 107 | */ |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 108 | static unsigned long trace_nr_entries = 65536UL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 109 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 110 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 111 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 112 | |
| 113 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 114 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 115 | |
| 116 | /* |
| 117 | * max_tracer_type_len is used to simplify the allocating of |
| 118 | * buffers to read userspace tracer names. We keep track of |
| 119 | * the longest tracer name registered. |
| 120 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 121 | static int max_tracer_type_len; |
| 122 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 123 | /* |
| 124 | * trace_types_lock is used to protect the trace_types list. |
| 125 | * This lock is also used to keep user access serialized. |
| 126 | * Accesses from userspace will grab this lock while userspace |
| 127 | * activities happen inside the kernel. |
| 128 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 129 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 130 | |
| 131 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 132 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 133 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 134 | /* trace_flags holds iter_ctrl options */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 135 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 136 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 137 | /** |
| 138 | * trace_wake_up - wake up tasks waiting for trace input |
| 139 | * |
| 140 | * Simply wakes up any task that is blocked on the trace_wait |
| 141 | * queue. These is used with trace_poll for tasks polling the trace. |
| 142 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 143 | void trace_wake_up(void) |
| 144 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 145 | /* |
| 146 | * The runqueue_is_locked() can fail, but this is the best we |
| 147 | * have for now: |
| 148 | */ |
| 149 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 150 | wake_up(&trace_wait); |
| 151 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 152 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 153 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
| 154 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 155 | static int __init set_nr_entries(char *str) |
| 156 | { |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 157 | unsigned long nr_entries; |
| 158 | int ret; |
| 159 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 160 | if (!str) |
| 161 | return 0; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 162 | ret = strict_strtoul(str, 0, &nr_entries); |
| 163 | /* nr_entries can not be zero */ |
| 164 | if (ret < 0 || nr_entries == 0) |
| 165 | return 0; |
| 166 | trace_nr_entries = nr_entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 167 | return 1; |
| 168 | } |
| 169 | __setup("trace_entries=", set_nr_entries); |
| 170 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 171 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 172 | { |
| 173 | return nsecs / 1000; |
| 174 | } |
| 175 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 176 | /* |
| 177 | * trace_flag_type is an enumeration that holds different |
| 178 | * states when a trace occurs. These are: |
| 179 | * IRQS_OFF - interrupts were disabled |
| 180 | * NEED_RESCED - reschedule is requested |
| 181 | * HARDIRQ - inside an interrupt handler |
| 182 | * SOFTIRQ - inside a softirq handler |
| 183 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 184 | enum trace_flag_type { |
| 185 | TRACE_FLAG_IRQS_OFF = 0x01, |
| 186 | TRACE_FLAG_NEED_RESCHED = 0x02, |
| 187 | TRACE_FLAG_HARDIRQ = 0x04, |
| 188 | TRACE_FLAG_SOFTIRQ = 0x08, |
| 189 | }; |
| 190 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 191 | /* |
| 192 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
| 193 | * control the output of kernel symbols. |
| 194 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 195 | #define TRACE_ITER_SYM_MASK \ |
| 196 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 197 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 198 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 199 | static const char *trace_options[] = { |
| 200 | "print-parent", |
| 201 | "sym-offset", |
| 202 | "sym-addr", |
| 203 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 204 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 205 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 206 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 207 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 208 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 209 | "sched-tree", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 210 | NULL |
| 211 | }; |
| 212 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 213 | /* |
| 214 | * ftrace_max_lock is used to protect the swapping of buffers |
| 215 | * when taking a max snapshot. The buffers themselves are |
| 216 | * protected by per_cpu spinlocks. But the action of the swap |
| 217 | * needs its own lock. |
| 218 | * |
| 219 | * This is defined as a raw_spinlock_t in order to help |
| 220 | * with performance when lockdep debugging is enabled. |
| 221 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 222 | static raw_spinlock_t ftrace_max_lock = |
| 223 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 224 | |
| 225 | /* |
| 226 | * Copy the new maximum trace into the separate maximum-trace |
| 227 | * structure. (this way the maximum trace is permanently saved, |
| 228 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 229 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 230 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 231 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 232 | { |
| 233 | struct trace_array_cpu *data = tr->data[cpu]; |
| 234 | |
| 235 | max_tr.cpu = cpu; |
| 236 | max_tr.time_start = data->preempt_timestamp; |
| 237 | |
| 238 | data = max_tr.data[cpu]; |
| 239 | data->saved_latency = tracing_max_latency; |
| 240 | |
| 241 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 242 | data->pid = tsk->pid; |
| 243 | data->uid = tsk->uid; |
| 244 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 245 | data->policy = tsk->policy; |
| 246 | data->rt_priority = tsk->rt_priority; |
| 247 | |
| 248 | /* record this tasks comm */ |
| 249 | tracing_record_cmdline(current); |
| 250 | } |
| 251 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 252 | /** |
| 253 | * check_pages - integrity check of trace buffers |
| 254 | * |
| 255 | * As a safty measure we check to make sure the data pages have not |
| 256 | * been corrupted. TODO: configure to disable this because it adds |
| 257 | * a bit of overhead. |
| 258 | */ |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 259 | void check_pages(struct trace_array_cpu *data) |
| 260 | { |
| 261 | struct page *page, *tmp; |
| 262 | |
| 263 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); |
| 264 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); |
| 265 | |
| 266 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { |
| 267 | BUG_ON(page->lru.next->prev != &page->lru); |
| 268 | BUG_ON(page->lru.prev->next != &page->lru); |
| 269 | } |
| 270 | } |
| 271 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 272 | /** |
| 273 | * head_page - page address of the first page in per_cpu buffer. |
| 274 | * |
| 275 | * head_page returns the page address of the first page in |
| 276 | * a per_cpu buffer. This also preforms various consistency |
| 277 | * checks to make sure the buffer has not been corrupted. |
| 278 | */ |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 279 | void *head_page(struct trace_array_cpu *data) |
| 280 | { |
| 281 | struct page *page; |
| 282 | |
| 283 | check_pages(data); |
| 284 | if (list_empty(&data->trace_pages)) |
| 285 | return NULL; |
| 286 | |
| 287 | page = list_entry(data->trace_pages.next, struct page, lru); |
| 288 | BUG_ON(&page->lru == &data->trace_pages); |
| 289 | |
| 290 | return page_address(page); |
| 291 | } |
| 292 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 293 | /** |
| 294 | * trace_seq_printf - sequence printing of trace information |
| 295 | * @s: trace sequence descriptor |
| 296 | * @fmt: printf format string |
| 297 | * |
| 298 | * The tracer may use either sequence operations or its own |
| 299 | * copy to user routines. To simplify formating of a trace |
| 300 | * trace_seq_printf is used to store strings into a special |
| 301 | * buffer (@s). Then the output may be either used by |
| 302 | * the sequencer or pulled into another buffer. |
| 303 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 304 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 305 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 306 | { |
| 307 | int len = (PAGE_SIZE - 1) - s->len; |
| 308 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 309 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 310 | |
| 311 | if (!len) |
| 312 | return 0; |
| 313 | |
| 314 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 315 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 316 | va_end(ap); |
| 317 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 318 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 319 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 320 | return 0; |
| 321 | |
| 322 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 323 | |
| 324 | return len; |
| 325 | } |
| 326 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 327 | /** |
| 328 | * trace_seq_puts - trace sequence printing of simple string |
| 329 | * @s: trace sequence descriptor |
| 330 | * @str: simple string to record |
| 331 | * |
| 332 | * The tracer may use either the sequence operations or its own |
| 333 | * copy to user routines. This function records a simple string |
| 334 | * into a special buffer (@s) for later retrieval by a sequencer |
| 335 | * or other mechanism. |
| 336 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 337 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 338 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 339 | { |
| 340 | int len = strlen(str); |
| 341 | |
| 342 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 343 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 344 | |
| 345 | memcpy(s->buffer + s->len, str, len); |
| 346 | s->len += len; |
| 347 | |
| 348 | return len; |
| 349 | } |
| 350 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 351 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 352 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 353 | { |
| 354 | if (s->len >= (PAGE_SIZE - 1)) |
| 355 | return 0; |
| 356 | |
| 357 | s->buffer[s->len++] = c; |
| 358 | |
| 359 | return 1; |
| 360 | } |
| 361 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 362 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 363 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 364 | { |
| 365 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 366 | return 0; |
| 367 | |
| 368 | memcpy(s->buffer + s->len, mem, len); |
| 369 | s->len += len; |
| 370 | |
| 371 | return len; |
| 372 | } |
| 373 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 374 | #define HEX_CHARS 17 |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 375 | static const char hex2asc[] = "0123456789abcdef"; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 376 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 377 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 378 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 379 | { |
| 380 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 381 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 382 | unsigned char byte; |
| 383 | int i, j; |
| 384 | |
| 385 | BUG_ON(len >= HEX_CHARS); |
| 386 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 387 | #ifdef __BIG_ENDIAN |
| 388 | for (i = 0, j = 0; i < len; i++) { |
| 389 | #else |
| 390 | for (i = len-1, j = 0; i >= 0; i--) { |
| 391 | #endif |
| 392 | byte = data[i]; |
| 393 | |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 394 | hex[j++] = hex2asc[byte & 0x0f]; |
| 395 | hex[j++] = hex2asc[byte >> 4]; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 396 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 397 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 398 | |
| 399 | return trace_seq_putmem(s, hex, j); |
| 400 | } |
| 401 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 402 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 403 | trace_seq_reset(struct trace_seq *s) |
| 404 | { |
| 405 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 406 | s->readpos = 0; |
| 407 | } |
| 408 | |
| 409 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 410 | { |
| 411 | int len; |
| 412 | int ret; |
| 413 | |
| 414 | if (s->len <= s->readpos) |
| 415 | return -EBUSY; |
| 416 | |
| 417 | len = s->len - s->readpos; |
| 418 | if (cnt > len) |
| 419 | cnt = len; |
| 420 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 421 | if (ret) |
| 422 | return -EFAULT; |
| 423 | |
| 424 | s->readpos += len; |
| 425 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 426 | } |
| 427 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 428 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 429 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 430 | { |
| 431 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 432 | |
| 433 | s->buffer[len] = 0; |
| 434 | seq_puts(m, s->buffer); |
| 435 | |
| 436 | trace_seq_reset(s); |
| 437 | } |
| 438 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 439 | /* |
| 440 | * flip the trace buffers between two trace descriptors. |
| 441 | * This usually is the buffers between the global_trace and |
| 442 | * the max_tr to record a snapshot of a current trace. |
| 443 | * |
| 444 | * The ftrace_max_lock must be held. |
| 445 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 446 | static void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 447 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
| 448 | { |
| 449 | struct list_head flip_pages; |
| 450 | |
| 451 | INIT_LIST_HEAD(&flip_pages); |
| 452 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 453 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 454 | sizeof(struct trace_array_cpu) - |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 455 | offsetof(struct trace_array_cpu, trace_head_idx)); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 456 | |
| 457 | check_pages(tr1); |
| 458 | check_pages(tr2); |
| 459 | list_splice_init(&tr1->trace_pages, &flip_pages); |
| 460 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); |
| 461 | list_splice_init(&flip_pages, &tr2->trace_pages); |
| 462 | BUG_ON(!list_empty(&flip_pages)); |
| 463 | check_pages(tr1); |
| 464 | check_pages(tr2); |
| 465 | } |
| 466 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 467 | /** |
| 468 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 469 | * @tr: tracer |
| 470 | * @tsk: the task with the latency |
| 471 | * @cpu: The cpu that initiated the trace. |
| 472 | * |
| 473 | * Flip the buffers between the @tr and the max_tr and record information |
| 474 | * about which task was the cause of this latency. |
| 475 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 476 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 477 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 478 | { |
| 479 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 480 | int i; |
| 481 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 482 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 483 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 484 | /* clear out all the previous traces */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 485 | for_each_tracing_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 486 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 487 | flip_trace(max_tr.data[i], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 488 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 492 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | /** |
| 496 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 497 | * @tr - tracer |
| 498 | * @tsk - task with the latency |
| 499 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 500 | * |
| 501 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 502 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 503 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 504 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 505 | { |
| 506 | struct trace_array_cpu *data = tr->data[cpu]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 507 | int i; |
| 508 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 509 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 510 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 511 | for_each_tracing_cpu(i) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 512 | tracing_reset(max_tr.data[i]); |
| 513 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 514 | flip_trace(max_tr.data[cpu], data); |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 515 | tracing_reset(data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 516 | |
| 517 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 518 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 519 | } |
| 520 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 521 | /** |
| 522 | * register_tracer - register a tracer with the ftrace system. |
| 523 | * @type - the plugin for the tracer |
| 524 | * |
| 525 | * Register a new plugin tracer. |
| 526 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 527 | int register_tracer(struct tracer *type) |
| 528 | { |
| 529 | struct tracer *t; |
| 530 | int len; |
| 531 | int ret = 0; |
| 532 | |
| 533 | if (!type->name) { |
| 534 | pr_info("Tracer must have a name\n"); |
| 535 | return -1; |
| 536 | } |
| 537 | |
| 538 | mutex_lock(&trace_types_lock); |
| 539 | for (t = trace_types; t; t = t->next) { |
| 540 | if (strcmp(type->name, t->name) == 0) { |
| 541 | /* already found */ |
| 542 | pr_info("Trace %s already registered\n", |
| 543 | type->name); |
| 544 | ret = -1; |
| 545 | goto out; |
| 546 | } |
| 547 | } |
| 548 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 549 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 550 | if (type->selftest) { |
| 551 | struct tracer *saved_tracer = current_trace; |
| 552 | struct trace_array_cpu *data; |
| 553 | struct trace_array *tr = &global_trace; |
| 554 | int saved_ctrl = tr->ctrl; |
| 555 | int i; |
| 556 | /* |
| 557 | * Run a selftest on this tracer. |
| 558 | * Here we reset the trace buffer, and set the current |
| 559 | * tracer to be this tracer. The tracer can then run some |
| 560 | * internal tracing to verify that everything is in order. |
| 561 | * If we fail, we do not register this tracer. |
| 562 | */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 563 | for_each_tracing_cpu(i) { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 564 | data = tr->data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 565 | if (!head_page(data)) |
| 566 | continue; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 567 | tracing_reset(data); |
| 568 | } |
| 569 | current_trace = type; |
| 570 | tr->ctrl = 0; |
| 571 | /* the test is responsible for initializing and enabling */ |
| 572 | pr_info("Testing tracer %s: ", type->name); |
| 573 | ret = type->selftest(type, tr); |
| 574 | /* the test is responsible for resetting too */ |
| 575 | current_trace = saved_tracer; |
| 576 | tr->ctrl = saved_ctrl; |
| 577 | if (ret) { |
| 578 | printk(KERN_CONT "FAILED!\n"); |
| 579 | goto out; |
| 580 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 581 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 582 | for_each_tracing_cpu(i) { |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 583 | data = tr->data[i]; |
| 584 | if (!head_page(data)) |
| 585 | continue; |
| 586 | tracing_reset(data); |
| 587 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 588 | printk(KERN_CONT "PASSED\n"); |
| 589 | } |
| 590 | #endif |
| 591 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 592 | type->next = trace_types; |
| 593 | trace_types = type; |
| 594 | len = strlen(type->name); |
| 595 | if (len > max_tracer_type_len) |
| 596 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 597 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 598 | out: |
| 599 | mutex_unlock(&trace_types_lock); |
| 600 | |
| 601 | return ret; |
| 602 | } |
| 603 | |
| 604 | void unregister_tracer(struct tracer *type) |
| 605 | { |
| 606 | struct tracer **t; |
| 607 | int len; |
| 608 | |
| 609 | mutex_lock(&trace_types_lock); |
| 610 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 611 | if (*t == type) |
| 612 | goto found; |
| 613 | } |
| 614 | pr_info("Trace %s not registered\n", type->name); |
| 615 | goto out; |
| 616 | |
| 617 | found: |
| 618 | *t = (*t)->next; |
| 619 | if (strlen(type->name) != max_tracer_type_len) |
| 620 | goto out; |
| 621 | |
| 622 | max_tracer_type_len = 0; |
| 623 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 624 | len = strlen((*t)->name); |
| 625 | if (len > max_tracer_type_len) |
| 626 | max_tracer_type_len = len; |
| 627 | } |
| 628 | out: |
| 629 | mutex_unlock(&trace_types_lock); |
| 630 | } |
| 631 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 632 | void tracing_reset(struct trace_array_cpu *data) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 633 | { |
| 634 | data->trace_idx = 0; |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 635 | data->overrun = 0; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 636 | data->trace_head = data->trace_tail = head_page(data); |
| 637 | data->trace_head_idx = 0; |
| 638 | data->trace_tail_idx = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 639 | } |
| 640 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 641 | #define SAVED_CMDLINES 128 |
| 642 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 643 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 644 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 645 | static int cmdline_idx; |
| 646 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 647 | |
| 648 | /* trace in all context switches */ |
| 649 | atomic_t trace_record_cmdline_enabled __read_mostly; |
| 650 | |
| 651 | /* temporary disable recording */ |
| 652 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 653 | |
| 654 | static void trace_init_cmdlines(void) |
| 655 | { |
| 656 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 657 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 658 | cmdline_idx = 0; |
| 659 | } |
| 660 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 661 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 662 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 663 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 664 | { |
| 665 | unsigned map; |
| 666 | unsigned idx; |
| 667 | |
| 668 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 669 | return; |
| 670 | |
| 671 | /* |
| 672 | * It's not the end of the world if we don't get |
| 673 | * the lock, but we also don't want to spin |
| 674 | * nor do we want to disable interrupts, |
| 675 | * so if we miss here, then better luck next time. |
| 676 | */ |
| 677 | if (!spin_trylock(&trace_cmdline_lock)) |
| 678 | return; |
| 679 | |
| 680 | idx = map_pid_to_cmdline[tsk->pid]; |
| 681 | if (idx >= SAVED_CMDLINES) { |
| 682 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 683 | |
| 684 | map = map_cmdline_to_pid[idx]; |
| 685 | if (map <= PID_MAX_DEFAULT) |
| 686 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 687 | |
| 688 | map_pid_to_cmdline[tsk->pid] = idx; |
| 689 | |
| 690 | cmdline_idx = idx; |
| 691 | } |
| 692 | |
| 693 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 694 | |
| 695 | spin_unlock(&trace_cmdline_lock); |
| 696 | } |
| 697 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 698 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 699 | { |
| 700 | char *cmdline = "<...>"; |
| 701 | unsigned map; |
| 702 | |
| 703 | if (!pid) |
| 704 | return "<idle>"; |
| 705 | |
| 706 | if (pid > PID_MAX_DEFAULT) |
| 707 | goto out; |
| 708 | |
| 709 | map = map_pid_to_cmdline[pid]; |
| 710 | if (map >= SAVED_CMDLINES) |
| 711 | goto out; |
| 712 | |
| 713 | cmdline = saved_cmdlines[map]; |
| 714 | |
| 715 | out: |
| 716 | return cmdline; |
| 717 | } |
| 718 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 719 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 720 | { |
| 721 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 722 | return; |
| 723 | |
| 724 | trace_save_cmdline(tsk); |
| 725 | } |
| 726 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 727 | static inline struct list_head * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 728 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
| 729 | { |
| 730 | /* |
| 731 | * Roundrobin - but skip the head (which is not a real page): |
| 732 | */ |
| 733 | next = next->next; |
| 734 | if (unlikely(next == &data->trace_pages)) |
| 735 | next = next->next; |
| 736 | BUG_ON(next == &data->trace_pages); |
| 737 | |
| 738 | return next; |
| 739 | } |
| 740 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 741 | static inline void * |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 742 | trace_next_page(struct trace_array_cpu *data, void *addr) |
| 743 | { |
| 744 | struct list_head *next; |
| 745 | struct page *page; |
| 746 | |
| 747 | page = virt_to_page(addr); |
| 748 | |
| 749 | next = trace_next_list(data, &page->lru); |
| 750 | page = list_entry(next, struct page, lru); |
| 751 | |
| 752 | return page_address(page); |
| 753 | } |
| 754 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 755 | static inline struct trace_entry * |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 756 | 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] | 757 | { |
| 758 | unsigned long idx, idx_next; |
| 759 | struct trace_entry *entry; |
| 760 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 761 | data->trace_idx++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 762 | idx = data->trace_head_idx; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 763 | idx_next = idx + 1; |
| 764 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 765 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
| 766 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 767 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 768 | |
| 769 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 770 | data->trace_head = trace_next_page(data, data->trace_head); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 771 | idx_next = 0; |
| 772 | } |
| 773 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 774 | if (data->trace_head == data->trace_tail && |
| 775 | idx_next == data->trace_tail_idx) { |
| 776 | /* overrun */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 777 | data->overrun++; |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 778 | data->trace_tail_idx++; |
| 779 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 780 | data->trace_tail = |
| 781 | trace_next_page(data, data->trace_tail); |
| 782 | data->trace_tail_idx = 0; |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | data->trace_head_idx = idx_next; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 787 | |
| 788 | return entry; |
| 789 | } |
| 790 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 791 | static inline void |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 792 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 793 | { |
| 794 | struct task_struct *tsk = current; |
| 795 | unsigned long pc; |
| 796 | |
| 797 | pc = preempt_count(); |
| 798 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 799 | entry->preempt_count = pc & 0xff; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 800 | entry->pid = (tsk) ? tsk->pid : 0; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 801 | entry->t = ftrace_now(raw_smp_processor_id()); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 802 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
| 803 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 804 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 805 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 806 | } |
| 807 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 808 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 809 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
| 810 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 811 | { |
| 812 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 813 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 814 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 815 | raw_local_irq_save(irq_flags); |
| 816 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 817 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 818 | tracing_generic_entry_update(entry, flags); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 819 | entry->type = TRACE_FN; |
| 820 | entry->fn.ip = ip; |
| 821 | entry->fn.parent_ip = parent_ip; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 822 | __raw_spin_unlock(&data->lock); |
| 823 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 824 | } |
| 825 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 826 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 827 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
| 828 | unsigned long ip, unsigned long parent_ip, unsigned long flags) |
| 829 | { |
| 830 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 831 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 832 | } |
| 833 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 834 | void __trace_stack(struct trace_array *tr, |
| 835 | struct trace_array_cpu *data, |
| 836 | unsigned long flags, |
| 837 | int skip) |
| 838 | { |
| 839 | struct trace_entry *entry; |
| 840 | struct stack_trace trace; |
| 841 | |
| 842 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 843 | return; |
| 844 | |
| 845 | entry = tracing_get_trace_entry(tr, data); |
| 846 | tracing_generic_entry_update(entry, flags); |
| 847 | entry->type = TRACE_STACK; |
| 848 | |
| 849 | memset(&entry->stack, 0, sizeof(entry->stack)); |
| 850 | |
| 851 | trace.nr_entries = 0; |
| 852 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 853 | trace.skip = skip; |
| 854 | trace.entries = entry->stack.caller; |
| 855 | |
| 856 | save_stack_trace(&trace); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 857 | } |
| 858 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 859 | void |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 860 | __trace_special(void *__tr, void *__data, |
| 861 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 862 | { |
| 863 | struct trace_array_cpu *data = __data; |
| 864 | struct trace_array *tr = __tr; |
| 865 | struct trace_entry *entry; |
| 866 | unsigned long irq_flags; |
| 867 | |
| 868 | raw_local_irq_save(irq_flags); |
| 869 | __raw_spin_lock(&data->lock); |
| 870 | entry = tracing_get_trace_entry(tr, data); |
| 871 | tracing_generic_entry_update(entry, 0); |
| 872 | entry->type = TRACE_SPECIAL; |
| 873 | entry->special.arg1 = arg1; |
| 874 | entry->special.arg2 = arg2; |
| 875 | entry->special.arg3 = arg3; |
| 876 | __trace_stack(tr, data, irq_flags, 4); |
| 877 | __raw_spin_unlock(&data->lock); |
| 878 | raw_local_irq_restore(irq_flags); |
| 879 | |
| 880 | trace_wake_up(); |
| 881 | } |
| 882 | |
| 883 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 884 | tracing_sched_switch_trace(struct trace_array *tr, |
| 885 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 886 | struct task_struct *prev, |
| 887 | struct task_struct *next, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 888 | unsigned long flags) |
| 889 | { |
| 890 | struct trace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 891 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 892 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 893 | raw_local_irq_save(irq_flags); |
| 894 | __raw_spin_lock(&data->lock); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 895 | entry = tracing_get_trace_entry(tr, data); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 896 | tracing_generic_entry_update(entry, flags); |
| 897 | entry->type = TRACE_CTX; |
| 898 | entry->ctx.prev_pid = prev->pid; |
| 899 | entry->ctx.prev_prio = prev->prio; |
| 900 | entry->ctx.prev_state = prev->state; |
| 901 | entry->ctx.next_pid = next->pid; |
| 902 | entry->ctx.next_prio = next->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 903 | entry->ctx.next_state = next->state; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 904 | __trace_stack(tr, data, flags, 4); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 905 | __raw_spin_unlock(&data->lock); |
| 906 | raw_local_irq_restore(irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 907 | } |
| 908 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 909 | void |
| 910 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 911 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 912 | struct task_struct *wakee, |
| 913 | struct task_struct *curr, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 914 | unsigned long flags) |
| 915 | { |
| 916 | struct trace_entry *entry; |
| 917 | unsigned long irq_flags; |
| 918 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 919 | raw_local_irq_save(irq_flags); |
| 920 | __raw_spin_lock(&data->lock); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 921 | entry = tracing_get_trace_entry(tr, data); |
| 922 | tracing_generic_entry_update(entry, flags); |
| 923 | entry->type = TRACE_WAKE; |
| 924 | entry->ctx.prev_pid = curr->pid; |
| 925 | entry->ctx.prev_prio = curr->prio; |
| 926 | entry->ctx.prev_state = curr->state; |
| 927 | entry->ctx.next_pid = wakee->pid; |
| 928 | entry->ctx.next_prio = wakee->prio; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 929 | entry->ctx.next_state = wakee->state; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 930 | __trace_stack(tr, data, flags, 5); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 931 | __raw_spin_unlock(&data->lock); |
| 932 | raw_local_irq_restore(irq_flags); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 933 | |
| 934 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 935 | } |
| 936 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 937 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 938 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 939 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 940 | { |
| 941 | struct trace_array *tr = &global_trace; |
| 942 | struct trace_array_cpu *data; |
| 943 | unsigned long flags; |
| 944 | long disabled; |
| 945 | int cpu; |
| 946 | |
| 947 | if (unlikely(!tracer_enabled)) |
| 948 | return; |
| 949 | |
| 950 | local_irq_save(flags); |
| 951 | cpu = raw_smp_processor_id(); |
| 952 | data = tr->data[cpu]; |
| 953 | disabled = atomic_inc_return(&data->disabled); |
| 954 | |
| 955 | if (likely(disabled == 1)) |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 956 | trace_function(tr, data, ip, parent_ip, flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 957 | |
| 958 | atomic_dec(&data->disabled); |
| 959 | local_irq_restore(flags); |
| 960 | } |
| 961 | |
| 962 | static struct ftrace_ops trace_ops __read_mostly = |
| 963 | { |
| 964 | .func = function_trace_call, |
| 965 | }; |
| 966 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 967 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 968 | { |
| 969 | register_ftrace_function(&trace_ops); |
| 970 | } |
| 971 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 972 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 973 | { |
| 974 | unregister_ftrace_function(&trace_ops); |
| 975 | } |
| 976 | #endif |
| 977 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 978 | enum trace_file_type { |
| 979 | TRACE_FILE_LAT_FMT = 1, |
| 980 | }; |
| 981 | |
| 982 | static struct trace_entry * |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 983 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
| 984 | struct trace_iterator *iter, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 985 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 986 | struct page *page; |
| 987 | struct trace_entry *array; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 988 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 989 | if (iter->next_idx[cpu] >= tr->entries || |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 990 | iter->next_idx[cpu] >= data->trace_idx || |
| 991 | (data->trace_head == data->trace_tail && |
| 992 | data->trace_head_idx == data->trace_tail_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 993 | return NULL; |
| 994 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 995 | if (!iter->next_page[cpu]) { |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 996 | /* Initialize the iterator for this cpu trace buffer */ |
| 997 | WARN_ON(!data->trace_tail); |
| 998 | page = virt_to_page(data->trace_tail); |
| 999 | iter->next_page[cpu] = &page->lru; |
| 1000 | iter->next_page_idx[cpu] = data->trace_tail_idx; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1001 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1002 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1003 | page = list_entry(iter->next_page[cpu], struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1004 | BUG_ON(&data->trace_pages == &page->lru); |
| 1005 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1006 | array = page_address(page); |
| 1007 | |
Steven Rostedt | 93a588f | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1008 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1009 | return &array[iter->next_page_idx[cpu]]; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1010 | } |
| 1011 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1012 | static struct trace_entry * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1013 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
| 1014 | { |
| 1015 | struct trace_array *tr = iter->tr; |
| 1016 | struct trace_entry *ent, *next = NULL; |
| 1017 | int next_cpu = -1; |
| 1018 | int cpu; |
| 1019 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1020 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1021 | if (!head_page(tr->data[cpu])) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1022 | continue; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1023 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1024 | /* |
| 1025 | * Pick the entry with the smallest timestamp: |
| 1026 | */ |
| 1027 | if (ent && (!next || ent->t < next->t)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1028 | next = ent; |
| 1029 | next_cpu = cpu; |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | if (ent_cpu) |
| 1034 | *ent_cpu = next_cpu; |
| 1035 | |
| 1036 | return next; |
| 1037 | } |
| 1038 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1039 | static void trace_iterator_increment(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1040 | { |
| 1041 | iter->idx++; |
| 1042 | iter->next_idx[iter->cpu]++; |
| 1043 | iter->next_page_idx[iter->cpu]++; |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1044 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1045 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
| 1046 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 1047 | |
| 1048 | iter->next_page_idx[iter->cpu] = 0; |
| 1049 | iter->next_page[iter->cpu] = |
| 1050 | trace_next_list(data, iter->next_page[iter->cpu]); |
| 1051 | } |
| 1052 | } |
| 1053 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1054 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1055 | { |
| 1056 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; |
| 1057 | |
| 1058 | data->trace_tail_idx++; |
| 1059 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { |
| 1060 | data->trace_tail = trace_next_page(data, data->trace_tail); |
| 1061 | data->trace_tail_idx = 0; |
| 1062 | } |
| 1063 | |
| 1064 | /* Check if we empty it, then reset the index */ |
| 1065 | if (data->trace_head == data->trace_tail && |
| 1066 | data->trace_head_idx == data->trace_tail_idx) |
| 1067 | data->trace_idx = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1068 | } |
| 1069 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1070 | static void *find_next_entry_inc(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1071 | { |
| 1072 | struct trace_entry *next; |
| 1073 | int next_cpu = -1; |
| 1074 | |
| 1075 | next = find_next_entry(iter, &next_cpu); |
| 1076 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1077 | iter->prev_ent = iter->ent; |
| 1078 | iter->prev_cpu = iter->cpu; |
| 1079 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1080 | iter->ent = next; |
| 1081 | iter->cpu = next_cpu; |
| 1082 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1083 | if (next) |
| 1084 | trace_iterator_increment(iter); |
| 1085 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1086 | return next ? iter : NULL; |
| 1087 | } |
| 1088 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1089 | 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] | 1090 | { |
| 1091 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1092 | void *last_ent = iter->ent; |
| 1093 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1094 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1095 | |
| 1096 | (*pos)++; |
| 1097 | |
| 1098 | /* can't go backwards */ |
| 1099 | if (iter->idx > i) |
| 1100 | return NULL; |
| 1101 | |
| 1102 | if (iter->idx < 0) |
| 1103 | ent = find_next_entry_inc(iter); |
| 1104 | else |
| 1105 | ent = iter; |
| 1106 | |
| 1107 | while (ent && iter->idx < i) |
| 1108 | ent = find_next_entry_inc(iter); |
| 1109 | |
| 1110 | iter->pos = *pos; |
| 1111 | |
| 1112 | if (last_ent && !ent) |
| 1113 | seq_puts(m, "\n\nvim:ft=help\n"); |
| 1114 | |
| 1115 | return ent; |
| 1116 | } |
| 1117 | |
| 1118 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1119 | { |
| 1120 | struct trace_iterator *iter = m->private; |
| 1121 | void *p = NULL; |
| 1122 | loff_t l = 0; |
| 1123 | int i; |
| 1124 | |
| 1125 | mutex_lock(&trace_types_lock); |
| 1126 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1127 | if (!current_trace || current_trace != iter->trace) { |
| 1128 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1129 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1130 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1131 | |
| 1132 | atomic_inc(&trace_record_cmdline_disabled); |
| 1133 | |
| 1134 | /* let the tracer grab locks here if needed */ |
| 1135 | if (current_trace->start) |
| 1136 | current_trace->start(iter); |
| 1137 | |
| 1138 | if (*pos != iter->pos) { |
| 1139 | iter->ent = NULL; |
| 1140 | iter->cpu = 0; |
| 1141 | iter->idx = -1; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1142 | iter->prev_ent = NULL; |
| 1143 | iter->prev_cpu = -1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1144 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1145 | for_each_tracing_cpu(i) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1146 | iter->next_idx[i] = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1147 | iter->next_page[i] = NULL; |
| 1148 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1149 | |
| 1150 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1151 | ; |
| 1152 | |
| 1153 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1154 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1155 | p = s_next(m, p, &l); |
| 1156 | } |
| 1157 | |
| 1158 | return p; |
| 1159 | } |
| 1160 | |
| 1161 | static void s_stop(struct seq_file *m, void *p) |
| 1162 | { |
| 1163 | struct trace_iterator *iter = m->private; |
| 1164 | |
| 1165 | atomic_dec(&trace_record_cmdline_disabled); |
| 1166 | |
| 1167 | /* let the tracer release locks here if needed */ |
| 1168 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 1169 | iter->trace->stop(iter); |
| 1170 | |
| 1171 | mutex_unlock(&trace_types_lock); |
| 1172 | } |
| 1173 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1174 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1175 | 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] | 1176 | { |
| 1177 | #ifdef CONFIG_KALLSYMS |
| 1178 | char str[KSYM_SYMBOL_LEN]; |
| 1179 | |
| 1180 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1181 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1182 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1183 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1184 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1185 | } |
| 1186 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1187 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1188 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1189 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1190 | { |
| 1191 | #ifdef CONFIG_KALLSYMS |
| 1192 | char str[KSYM_SYMBOL_LEN]; |
| 1193 | |
| 1194 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1195 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1196 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1197 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1198 | } |
| 1199 | |
| 1200 | #ifndef CONFIG_64BIT |
| 1201 | # define IP_FMT "%08lx" |
| 1202 | #else |
| 1203 | # define IP_FMT "%016lx" |
| 1204 | #endif |
| 1205 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1206 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1207 | 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] | 1208 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1209 | int ret; |
| 1210 | |
| 1211 | if (!ip) |
| 1212 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1213 | |
| 1214 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1215 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1216 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1217 | ret = seq_print_sym_short(s, "%s", ip); |
| 1218 | |
| 1219 | if (!ret) |
| 1220 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1221 | |
| 1222 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1223 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1224 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1225 | } |
| 1226 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1227 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1228 | { |
| 1229 | seq_puts(m, "# _------=> CPU# \n"); |
| 1230 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1231 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1232 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1233 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1234 | seq_puts(m, "# |||| / \n"); |
| 1235 | seq_puts(m, "# ||||| delay \n"); |
| 1236 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1237 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
| 1238 | } |
| 1239 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1240 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1241 | { |
| 1242 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1243 | seq_puts(m, "# | | | | |\n"); |
| 1244 | } |
| 1245 | |
| 1246 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1247 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1248 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1249 | { |
| 1250 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1251 | struct trace_array *tr = iter->tr; |
| 1252 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1253 | struct tracer *type = current_trace; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1254 | unsigned long total = 0; |
| 1255 | unsigned long entries = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1256 | int cpu; |
| 1257 | const char *name = "preemption"; |
| 1258 | |
| 1259 | if (type) |
| 1260 | name = type->name; |
| 1261 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1262 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1263 | if (head_page(tr->data[cpu])) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1264 | total += tr->data[cpu]->trace_idx; |
| 1265 | if (tr->data[cpu]->trace_idx > tr->entries) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1266 | entries += tr->entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1267 | else |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1268 | entries += tr->data[cpu]->trace_idx; |
| 1269 | } |
| 1270 | } |
| 1271 | |
| 1272 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1273 | name, UTS_RELEASE); |
| 1274 | seq_puts(m, "-----------------------------------" |
| 1275 | "---------------------------------\n"); |
| 1276 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1277 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1278 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1279 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1280 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1281 | tr->cpu, |
| 1282 | #if defined(CONFIG_PREEMPT_NONE) |
| 1283 | "server", |
| 1284 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1285 | "desktop", |
| 1286 | #elif defined(CONFIG_PREEMPT_DESKTOP) |
| 1287 | "preempt", |
| 1288 | #else |
| 1289 | "unknown", |
| 1290 | #endif |
| 1291 | /* These are reserved for later use */ |
| 1292 | 0, 0, 0, 0); |
| 1293 | #ifdef CONFIG_SMP |
| 1294 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1295 | #else |
| 1296 | seq_puts(m, ")\n"); |
| 1297 | #endif |
| 1298 | seq_puts(m, " -----------------\n"); |
| 1299 | seq_printf(m, " | task: %.16s-%d " |
| 1300 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1301 | data->comm, data->pid, data->uid, data->nice, |
| 1302 | data->policy, data->rt_priority); |
| 1303 | seq_puts(m, " -----------------\n"); |
| 1304 | |
| 1305 | if (data->critical_start) { |
| 1306 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1307 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1308 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1309 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1310 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1311 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1312 | seq_puts(m, "\n"); |
| 1313 | } |
| 1314 | |
| 1315 | seq_puts(m, "\n"); |
| 1316 | } |
| 1317 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1318 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1319 | 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] | 1320 | { |
| 1321 | int hardirq, softirq; |
| 1322 | char *comm; |
| 1323 | |
| 1324 | comm = trace_find_cmdline(entry->pid); |
| 1325 | |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1326 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
| 1327 | trace_seq_printf(s, "%d", cpu); |
| 1328 | trace_seq_printf(s, "%c%c", |
| 1329 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1330 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1331 | |
| 1332 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1333 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1334 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1335 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1336 | } else { |
| 1337 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1338 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1339 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1340 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1341 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1342 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1343 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | if (entry->preempt_count) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1348 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1349 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1350 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1351 | } |
| 1352 | |
| 1353 | unsigned long preempt_mark_thresh = 100; |
| 1354 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1355 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1356 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1357 | unsigned long rel_usecs) |
| 1358 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1359 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1360 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1361 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1362 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1363 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1364 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1365 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1369 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1370 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1371 | 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] | 1372 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1373 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1374 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1375 | struct trace_entry *next_entry = find_next_entry(iter, NULL); |
| 1376 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1377 | struct trace_entry *entry = iter->ent; |
| 1378 | unsigned long abs_usecs; |
| 1379 | unsigned long rel_usecs; |
| 1380 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1381 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1382 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1383 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1384 | |
| 1385 | if (!next_entry) |
| 1386 | next_entry = entry; |
| 1387 | rel_usecs = ns2usecs(next_entry->t - entry->t); |
| 1388 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); |
| 1389 | |
| 1390 | if (verbose) { |
| 1391 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1392 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
| 1393 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1394 | comm, |
| 1395 | entry->pid, cpu, entry->flags, |
| 1396 | entry->preempt_count, trace_idx, |
| 1397 | ns2usecs(entry->t), |
| 1398 | abs_usecs/1000, |
| 1399 | abs_usecs % 1000, rel_usecs/1000, |
| 1400 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1401 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1402 | lat_print_generic(s, entry, cpu); |
| 1403 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1404 | } |
| 1405 | switch (entry->type) { |
| 1406 | case TRACE_FN: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1407 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1408 | trace_seq_puts(s, " ("); |
| 1409 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); |
| 1410 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1411 | break; |
| 1412 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1413 | case TRACE_WAKE: |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1414 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1415 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1416 | |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1417 | state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0; |
| 1418 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1419 | comm = trace_find_cmdline(entry->ctx.next_pid); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1420 | 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] | 1421 | entry->ctx.prev_pid, |
| 1422 | entry->ctx.prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1423 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1424 | entry->ctx.next_pid, |
| 1425 | entry->ctx.next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1426 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1427 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1428 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1429 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1430 | entry->special.arg1, |
| 1431 | entry->special.arg2, |
| 1432 | entry->special.arg3); |
| 1433 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1434 | case TRACE_STACK: |
| 1435 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1436 | if (i) |
| 1437 | trace_seq_puts(s, " <= "); |
| 1438 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); |
| 1439 | } |
| 1440 | trace_seq_puts(s, "\n"); |
| 1441 | break; |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1442 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1443 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1444 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1445 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1446 | } |
| 1447 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1448 | static int print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1449 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1450 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1451 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1452 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1453 | unsigned long usec_rem; |
| 1454 | unsigned long long t; |
| 1455 | unsigned long secs; |
| 1456 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1457 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1458 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1459 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1460 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1461 | entry = iter->ent; |
| 1462 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1463 | comm = trace_find_cmdline(iter->ent->pid); |
| 1464 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1465 | t = ns2usecs(entry->t); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1466 | usec_rem = do_div(t, 1000000ULL); |
| 1467 | secs = (unsigned long)t; |
| 1468 | |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1469 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
| 1470 | if (!ret) |
| 1471 | return 0; |
| 1472 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); |
| 1473 | if (!ret) |
| 1474 | return 0; |
| 1475 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1476 | if (!ret) |
| 1477 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1478 | |
| 1479 | switch (entry->type) { |
| 1480 | case TRACE_FN: |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1481 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
| 1482 | if (!ret) |
| 1483 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1484 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
| 1485 | entry->fn.parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1486 | ret = trace_seq_printf(s, " <-"); |
| 1487 | if (!ret) |
| 1488 | return 0; |
| 1489 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, |
| 1490 | sym_flags); |
| 1491 | if (!ret) |
| 1492 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1493 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1494 | ret = trace_seq_printf(s, "\n"); |
| 1495 | if (!ret) |
| 1496 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1497 | break; |
| 1498 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1499 | case TRACE_WAKE: |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1500 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1501 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1502 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1503 | state_to_char[entry->ctx.next_state] : 'X'; |
| 1504 | 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] | 1505 | entry->ctx.prev_pid, |
| 1506 | entry->ctx.prev_prio, |
| 1507 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1508 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1509 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1510 | entry->ctx.next_prio, |
| 1511 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1512 | if (!ret) |
| 1513 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1514 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1515 | case TRACE_SPECIAL: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1516 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1517 | entry->special.arg1, |
| 1518 | entry->special.arg2, |
| 1519 | entry->special.arg3); |
| 1520 | if (!ret) |
| 1521 | return 0; |
| 1522 | break; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1523 | case TRACE_STACK: |
| 1524 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1525 | if (i) { |
| 1526 | ret = trace_seq_puts(s, " <= "); |
| 1527 | if (!ret) |
| 1528 | return 0; |
| 1529 | } |
| 1530 | ret = seq_print_ip_sym(s, entry->stack.caller[i], |
| 1531 | sym_flags); |
| 1532 | if (!ret) |
| 1533 | return 0; |
| 1534 | } |
| 1535 | ret = trace_seq_puts(s, "\n"); |
| 1536 | if (!ret) |
| 1537 | return 0; |
| 1538 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1539 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1540 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1541 | } |
| 1542 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1543 | static int print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1544 | { |
| 1545 | struct trace_seq *s = &iter->seq; |
| 1546 | struct trace_entry *entry; |
| 1547 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1548 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1549 | |
| 1550 | entry = iter->ent; |
| 1551 | |
| 1552 | ret = trace_seq_printf(s, "%d %d %llu ", |
| 1553 | entry->pid, iter->cpu, entry->t); |
| 1554 | if (!ret) |
| 1555 | return 0; |
| 1556 | |
| 1557 | switch (entry->type) { |
| 1558 | case TRACE_FN: |
| 1559 | ret = trace_seq_printf(s, "%x %x\n", |
| 1560 | entry->fn.ip, entry->fn.parent_ip); |
| 1561 | if (!ret) |
| 1562 | return 0; |
| 1563 | break; |
| 1564 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1565 | case TRACE_WAKE: |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1566 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1567 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1568 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1569 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1570 | if (entry->type == TRACE_WAKE) |
| 1571 | S = '+'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1572 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1573 | entry->ctx.prev_pid, |
| 1574 | entry->ctx.prev_prio, |
| 1575 | S, |
| 1576 | entry->ctx.next_pid, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1577 | entry->ctx.next_prio, |
| 1578 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1579 | if (!ret) |
| 1580 | return 0; |
| 1581 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1582 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1583 | case TRACE_STACK: |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1584 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1585 | entry->special.arg1, |
| 1586 | entry->special.arg2, |
| 1587 | entry->special.arg3); |
| 1588 | if (!ret) |
| 1589 | return 0; |
| 1590 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1591 | } |
| 1592 | return 1; |
| 1593 | } |
| 1594 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1595 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1596 | do { \ |
| 1597 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1598 | return 0; \ |
| 1599 | } while (0) |
| 1600 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1601 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1602 | do { \ |
| 1603 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1604 | return 0; \ |
| 1605 | } while (0) |
| 1606 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1607 | static int print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1608 | { |
| 1609 | struct trace_seq *s = &iter->seq; |
| 1610 | unsigned char newline = '\n'; |
| 1611 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1612 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1613 | |
| 1614 | entry = iter->ent; |
| 1615 | |
| 1616 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
| 1617 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
| 1618 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); |
| 1619 | |
| 1620 | switch (entry->type) { |
| 1621 | case TRACE_FN: |
| 1622 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); |
| 1623 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
| 1624 | break; |
| 1625 | case TRACE_CTX: |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1626 | case TRACE_WAKE: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1627 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
| 1628 | state_to_char[entry->ctx.prev_state] : 'X'; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1629 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
| 1630 | state_to_char[entry->ctx.next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1631 | if (entry->type == TRACE_WAKE) |
| 1632 | S = '+'; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1633 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
| 1634 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); |
| 1635 | SEQ_PUT_HEX_FIELD_RET(s, S); |
| 1636 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); |
| 1637 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); |
| 1638 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1639 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1640 | break; |
| 1641 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1642 | case TRACE_STACK: |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1643 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
| 1644 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); |
| 1645 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); |
| 1646 | break; |
| 1647 | } |
| 1648 | SEQ_PUT_FIELD_RET(s, newline); |
| 1649 | |
| 1650 | return 1; |
| 1651 | } |
| 1652 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1653 | static int print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1654 | { |
| 1655 | struct trace_seq *s = &iter->seq; |
| 1656 | struct trace_entry *entry; |
| 1657 | |
| 1658 | entry = iter->ent; |
| 1659 | |
| 1660 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1661 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
| 1662 | SEQ_PUT_FIELD_RET(s, entry->t); |
| 1663 | |
| 1664 | switch (entry->type) { |
| 1665 | case TRACE_FN: |
| 1666 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); |
| 1667 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); |
| 1668 | break; |
| 1669 | case TRACE_CTX: |
| 1670 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); |
| 1671 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); |
| 1672 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); |
| 1673 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); |
| 1674 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1675 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1676 | break; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1677 | case TRACE_SPECIAL: |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1678 | case TRACE_STACK: |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1679 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
| 1680 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); |
| 1681 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); |
| 1682 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1683 | } |
| 1684 | return 1; |
| 1685 | } |
| 1686 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1687 | static int trace_empty(struct trace_iterator *iter) |
| 1688 | { |
| 1689 | struct trace_array_cpu *data; |
| 1690 | int cpu; |
| 1691 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1692 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1693 | data = iter->tr->data[cpu]; |
| 1694 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1695 | if (head_page(data) && data->trace_idx && |
| 1696 | (data->trace_tail != data->trace_head || |
| 1697 | data->trace_tail_idx != data->trace_head_idx)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1698 | return 0; |
| 1699 | } |
| 1700 | return 1; |
| 1701 | } |
| 1702 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1703 | static int print_trace_line(struct trace_iterator *iter) |
| 1704 | { |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1705 | if (iter->trace && iter->trace->print_line) |
| 1706 | return iter->trace->print_line(iter); |
| 1707 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1708 | if (trace_flags & TRACE_ITER_BIN) |
| 1709 | return print_bin_fmt(iter); |
| 1710 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1711 | if (trace_flags & TRACE_ITER_HEX) |
| 1712 | return print_hex_fmt(iter); |
| 1713 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1714 | if (trace_flags & TRACE_ITER_RAW) |
| 1715 | return print_raw_fmt(iter); |
| 1716 | |
| 1717 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1718 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1719 | |
| 1720 | return print_trace_fmt(iter); |
| 1721 | } |
| 1722 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1723 | static int s_show(struct seq_file *m, void *v) |
| 1724 | { |
| 1725 | struct trace_iterator *iter = v; |
| 1726 | |
| 1727 | if (iter->ent == NULL) { |
| 1728 | if (iter->tr) { |
| 1729 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1730 | seq_puts(m, "#\n"); |
| 1731 | } |
| 1732 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1733 | /* print nothing if the buffers are empty */ |
| 1734 | if (trace_empty(iter)) |
| 1735 | return 0; |
| 1736 | print_trace_header(m, iter); |
| 1737 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1738 | print_lat_help_header(m); |
| 1739 | } else { |
| 1740 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1741 | print_func_help_header(m); |
| 1742 | } |
| 1743 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1744 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1745 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1746 | } |
| 1747 | |
| 1748 | return 0; |
| 1749 | } |
| 1750 | |
| 1751 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1752 | .start = s_start, |
| 1753 | .next = s_next, |
| 1754 | .stop = s_stop, |
| 1755 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1756 | }; |
| 1757 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1758 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1759 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1760 | { |
| 1761 | struct trace_iterator *iter; |
| 1762 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1763 | if (tracing_disabled) { |
| 1764 | *ret = -ENODEV; |
| 1765 | return NULL; |
| 1766 | } |
| 1767 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1768 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1769 | if (!iter) { |
| 1770 | *ret = -ENOMEM; |
| 1771 | goto out; |
| 1772 | } |
| 1773 | |
| 1774 | mutex_lock(&trace_types_lock); |
| 1775 | if (current_trace && current_trace->print_max) |
| 1776 | iter->tr = &max_tr; |
| 1777 | else |
| 1778 | iter->tr = inode->i_private; |
| 1779 | iter->trace = current_trace; |
| 1780 | iter->pos = -1; |
| 1781 | |
| 1782 | /* TODO stop tracer */ |
| 1783 | *ret = seq_open(file, &tracer_seq_ops); |
| 1784 | if (!*ret) { |
| 1785 | struct seq_file *m = file->private_data; |
| 1786 | m->private = iter; |
| 1787 | |
| 1788 | /* stop the trace while dumping */ |
| 1789 | if (iter->tr->ctrl) |
| 1790 | tracer_enabled = 0; |
| 1791 | |
| 1792 | if (iter->trace && iter->trace->open) |
| 1793 | iter->trace->open(iter); |
| 1794 | } else { |
| 1795 | kfree(iter); |
| 1796 | iter = NULL; |
| 1797 | } |
| 1798 | mutex_unlock(&trace_types_lock); |
| 1799 | |
| 1800 | out: |
| 1801 | return iter; |
| 1802 | } |
| 1803 | |
| 1804 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1805 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1806 | if (tracing_disabled) |
| 1807 | return -ENODEV; |
| 1808 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1809 | filp->private_data = inode->i_private; |
| 1810 | return 0; |
| 1811 | } |
| 1812 | |
| 1813 | int tracing_release(struct inode *inode, struct file *file) |
| 1814 | { |
| 1815 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1816 | struct trace_iterator *iter = m->private; |
| 1817 | |
| 1818 | mutex_lock(&trace_types_lock); |
| 1819 | if (iter->trace && iter->trace->close) |
| 1820 | iter->trace->close(iter); |
| 1821 | |
| 1822 | /* reenable tracing if it was previously enabled */ |
| 1823 | if (iter->tr->ctrl) |
| 1824 | tracer_enabled = 1; |
| 1825 | mutex_unlock(&trace_types_lock); |
| 1826 | |
| 1827 | seq_release(inode, file); |
| 1828 | kfree(iter); |
| 1829 | return 0; |
| 1830 | } |
| 1831 | |
| 1832 | static int tracing_open(struct inode *inode, struct file *file) |
| 1833 | { |
| 1834 | int ret; |
| 1835 | |
| 1836 | __tracing_open(inode, file, &ret); |
| 1837 | |
| 1838 | return ret; |
| 1839 | } |
| 1840 | |
| 1841 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1842 | { |
| 1843 | struct trace_iterator *iter; |
| 1844 | int ret; |
| 1845 | |
| 1846 | iter = __tracing_open(inode, file, &ret); |
| 1847 | |
| 1848 | if (!ret) |
| 1849 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1850 | |
| 1851 | return ret; |
| 1852 | } |
| 1853 | |
| 1854 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1855 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1856 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 1857 | { |
| 1858 | struct tracer *t = m->private; |
| 1859 | |
| 1860 | (*pos)++; |
| 1861 | |
| 1862 | if (t) |
| 1863 | t = t->next; |
| 1864 | |
| 1865 | m->private = t; |
| 1866 | |
| 1867 | return t; |
| 1868 | } |
| 1869 | |
| 1870 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 1871 | { |
| 1872 | struct tracer *t = m->private; |
| 1873 | loff_t l = 0; |
| 1874 | |
| 1875 | mutex_lock(&trace_types_lock); |
| 1876 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 1877 | ; |
| 1878 | |
| 1879 | return t; |
| 1880 | } |
| 1881 | |
| 1882 | static void t_stop(struct seq_file *m, void *p) |
| 1883 | { |
| 1884 | mutex_unlock(&trace_types_lock); |
| 1885 | } |
| 1886 | |
| 1887 | static int t_show(struct seq_file *m, void *v) |
| 1888 | { |
| 1889 | struct tracer *t = v; |
| 1890 | |
| 1891 | if (!t) |
| 1892 | return 0; |
| 1893 | |
| 1894 | seq_printf(m, "%s", t->name); |
| 1895 | if (t->next) |
| 1896 | seq_putc(m, ' '); |
| 1897 | else |
| 1898 | seq_putc(m, '\n'); |
| 1899 | |
| 1900 | return 0; |
| 1901 | } |
| 1902 | |
| 1903 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1904 | .start = t_start, |
| 1905 | .next = t_next, |
| 1906 | .stop = t_stop, |
| 1907 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1908 | }; |
| 1909 | |
| 1910 | static int show_traces_open(struct inode *inode, struct file *file) |
| 1911 | { |
| 1912 | int ret; |
| 1913 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1914 | if (tracing_disabled) |
| 1915 | return -ENODEV; |
| 1916 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1917 | ret = seq_open(file, &show_traces_seq_ops); |
| 1918 | if (!ret) { |
| 1919 | struct seq_file *m = file->private_data; |
| 1920 | m->private = trace_types; |
| 1921 | } |
| 1922 | |
| 1923 | return ret; |
| 1924 | } |
| 1925 | |
| 1926 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1927 | .open = tracing_open, |
| 1928 | .read = seq_read, |
| 1929 | .llseek = seq_lseek, |
| 1930 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1931 | }; |
| 1932 | |
| 1933 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1934 | .open = tracing_lt_open, |
| 1935 | .read = seq_read, |
| 1936 | .llseek = seq_lseek, |
| 1937 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1938 | }; |
| 1939 | |
| 1940 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1941 | .open = show_traces_open, |
| 1942 | .read = seq_read, |
| 1943 | .release = seq_release, |
| 1944 | }; |
| 1945 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1946 | /* |
| 1947 | * Only trace on a CPU if the bitmask is set: |
| 1948 | */ |
| 1949 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 1950 | |
| 1951 | /* |
| 1952 | * When tracing/tracing_cpu_mask is modified then this holds |
| 1953 | * the new bitmask we are about to install: |
| 1954 | */ |
| 1955 | static cpumask_t tracing_cpumask_new; |
| 1956 | |
| 1957 | /* |
| 1958 | * The tracer itself will not take this lock, but still we want |
| 1959 | * to provide a consistent cpumask to user-space: |
| 1960 | */ |
| 1961 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 1962 | |
| 1963 | /* |
| 1964 | * Temporary storage for the character representation of the |
| 1965 | * CPU bitmask (and one more byte for the newline): |
| 1966 | */ |
| 1967 | static char mask_str[NR_CPUS + 1]; |
| 1968 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1969 | static ssize_t |
| 1970 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 1971 | size_t count, loff_t *ppos) |
| 1972 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1973 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1974 | |
| 1975 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1976 | |
| 1977 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 1978 | if (count - len < 2) { |
| 1979 | count = -EINVAL; |
| 1980 | goto out_err; |
| 1981 | } |
| 1982 | len += sprintf(mask_str + len, "\n"); |
| 1983 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 1984 | |
| 1985 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1986 | mutex_unlock(&tracing_cpumask_update_lock); |
| 1987 | |
| 1988 | return count; |
| 1989 | } |
| 1990 | |
| 1991 | static ssize_t |
| 1992 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 1993 | size_t count, loff_t *ppos) |
| 1994 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1995 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1996 | |
| 1997 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 1998 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 1999 | if (err) |
| 2000 | goto err_unlock; |
| 2001 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2002 | raw_local_irq_disable(); |
| 2003 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2004 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2005 | /* |
| 2006 | * Increase/decrease the disabled counter if we are |
| 2007 | * about to flip a bit in the cpumask: |
| 2008 | */ |
| 2009 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2010 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2011 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2012 | } |
| 2013 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2014 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2015 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2016 | } |
| 2017 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2018 | __raw_spin_unlock(&ftrace_max_lock); |
| 2019 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2020 | |
| 2021 | tracing_cpumask = tracing_cpumask_new; |
| 2022 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2023 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2024 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2025 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2026 | |
| 2027 | err_unlock: |
| 2028 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2029 | |
| 2030 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2031 | } |
| 2032 | |
| 2033 | static struct file_operations tracing_cpumask_fops = { |
| 2034 | .open = tracing_open_generic, |
| 2035 | .read = tracing_cpumask_read, |
| 2036 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2037 | }; |
| 2038 | |
| 2039 | static ssize_t |
| 2040 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 2041 | size_t cnt, loff_t *ppos) |
| 2042 | { |
| 2043 | char *buf; |
| 2044 | int r = 0; |
| 2045 | int len = 0; |
| 2046 | int i; |
| 2047 | |
| 2048 | /* calulate max size */ |
| 2049 | for (i = 0; trace_options[i]; i++) { |
| 2050 | len += strlen(trace_options[i]); |
| 2051 | len += 3; /* "no" and space */ |
| 2052 | } |
| 2053 | |
| 2054 | /* +2 for \n and \0 */ |
| 2055 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2056 | if (!buf) |
| 2057 | return -ENOMEM; |
| 2058 | |
| 2059 | for (i = 0; trace_options[i]; i++) { |
| 2060 | if (trace_flags & (1 << i)) |
| 2061 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2062 | else |
| 2063 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2064 | } |
| 2065 | |
| 2066 | r += sprintf(buf + r, "\n"); |
| 2067 | WARN_ON(r >= len + 2); |
| 2068 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2069 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2070 | |
| 2071 | kfree(buf); |
| 2072 | |
| 2073 | return r; |
| 2074 | } |
| 2075 | |
| 2076 | static ssize_t |
| 2077 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2078 | size_t cnt, loff_t *ppos) |
| 2079 | { |
| 2080 | char buf[64]; |
| 2081 | char *cmp = buf; |
| 2082 | int neg = 0; |
| 2083 | int i; |
| 2084 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2085 | if (cnt >= sizeof(buf)) |
| 2086 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2087 | |
| 2088 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2089 | return -EFAULT; |
| 2090 | |
| 2091 | buf[cnt] = 0; |
| 2092 | |
| 2093 | if (strncmp(buf, "no", 2) == 0) { |
| 2094 | neg = 1; |
| 2095 | cmp += 2; |
| 2096 | } |
| 2097 | |
| 2098 | for (i = 0; trace_options[i]; i++) { |
| 2099 | int len = strlen(trace_options[i]); |
| 2100 | |
| 2101 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2102 | if (neg) |
| 2103 | trace_flags &= ~(1 << i); |
| 2104 | else |
| 2105 | trace_flags |= (1 << i); |
| 2106 | break; |
| 2107 | } |
| 2108 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2109 | /* |
| 2110 | * If no option could be set, return an error: |
| 2111 | */ |
| 2112 | if (!trace_options[i]) |
| 2113 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2114 | |
| 2115 | filp->f_pos += cnt; |
| 2116 | |
| 2117 | return cnt; |
| 2118 | } |
| 2119 | |
| 2120 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2121 | .open = tracing_open_generic, |
| 2122 | .read = tracing_iter_ctrl_read, |
| 2123 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2124 | }; |
| 2125 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2126 | static const char readme_msg[] = |
| 2127 | "tracing mini-HOWTO:\n\n" |
| 2128 | "# mkdir /debug\n" |
| 2129 | "# mount -t debugfs nodev /debug\n\n" |
| 2130 | "# cat /debug/tracing/available_tracers\n" |
| 2131 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2132 | "# cat /debug/tracing/current_tracer\n" |
| 2133 | "none\n" |
| 2134 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2135 | "# cat /debug/tracing/current_tracer\n" |
| 2136 | "sched_switch\n" |
| 2137 | "# cat /debug/tracing/iter_ctrl\n" |
| 2138 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 2139 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 2140 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2141 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2142 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2143 | ; |
| 2144 | |
| 2145 | static ssize_t |
| 2146 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2147 | size_t cnt, loff_t *ppos) |
| 2148 | { |
| 2149 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2150 | readme_msg, strlen(readme_msg)); |
| 2151 | } |
| 2152 | |
| 2153 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2154 | .open = tracing_open_generic, |
| 2155 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2156 | }; |
| 2157 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2158 | static ssize_t |
| 2159 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2160 | size_t cnt, loff_t *ppos) |
| 2161 | { |
| 2162 | struct trace_array *tr = filp->private_data; |
| 2163 | char buf[64]; |
| 2164 | int r; |
| 2165 | |
| 2166 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2167 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2168 | } |
| 2169 | |
| 2170 | static ssize_t |
| 2171 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2172 | size_t cnt, loff_t *ppos) |
| 2173 | { |
| 2174 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2175 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2176 | long val; |
| 2177 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2178 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2179 | if (cnt >= sizeof(buf)) |
| 2180 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2181 | |
| 2182 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2183 | return -EFAULT; |
| 2184 | |
| 2185 | buf[cnt] = 0; |
| 2186 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2187 | ret = strict_strtoul(buf, 10, &val); |
| 2188 | if (ret < 0) |
| 2189 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2190 | |
| 2191 | val = !!val; |
| 2192 | |
| 2193 | mutex_lock(&trace_types_lock); |
| 2194 | if (tr->ctrl ^ val) { |
| 2195 | if (val) |
| 2196 | tracer_enabled = 1; |
| 2197 | else |
| 2198 | tracer_enabled = 0; |
| 2199 | |
| 2200 | tr->ctrl = val; |
| 2201 | |
| 2202 | if (current_trace && current_trace->ctrl_update) |
| 2203 | current_trace->ctrl_update(tr); |
| 2204 | } |
| 2205 | mutex_unlock(&trace_types_lock); |
| 2206 | |
| 2207 | filp->f_pos += cnt; |
| 2208 | |
| 2209 | return cnt; |
| 2210 | } |
| 2211 | |
| 2212 | static ssize_t |
| 2213 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2214 | size_t cnt, loff_t *ppos) |
| 2215 | { |
| 2216 | char buf[max_tracer_type_len+2]; |
| 2217 | int r; |
| 2218 | |
| 2219 | mutex_lock(&trace_types_lock); |
| 2220 | if (current_trace) |
| 2221 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2222 | else |
| 2223 | r = sprintf(buf, "\n"); |
| 2224 | mutex_unlock(&trace_types_lock); |
| 2225 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2226 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2227 | } |
| 2228 | |
| 2229 | static ssize_t |
| 2230 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2231 | size_t cnt, loff_t *ppos) |
| 2232 | { |
| 2233 | struct trace_array *tr = &global_trace; |
| 2234 | struct tracer *t; |
| 2235 | char buf[max_tracer_type_len+1]; |
| 2236 | int i; |
| 2237 | |
| 2238 | if (cnt > max_tracer_type_len) |
| 2239 | cnt = max_tracer_type_len; |
| 2240 | |
| 2241 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2242 | return -EFAULT; |
| 2243 | |
| 2244 | buf[cnt] = 0; |
| 2245 | |
| 2246 | /* strip ending whitespace. */ |
| 2247 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2248 | buf[i] = 0; |
| 2249 | |
| 2250 | mutex_lock(&trace_types_lock); |
| 2251 | for (t = trace_types; t; t = t->next) { |
| 2252 | if (strcmp(t->name, buf) == 0) |
| 2253 | break; |
| 2254 | } |
| 2255 | if (!t || t == current_trace) |
| 2256 | goto out; |
| 2257 | |
| 2258 | if (current_trace && current_trace->reset) |
| 2259 | current_trace->reset(tr); |
| 2260 | |
| 2261 | current_trace = t; |
| 2262 | if (t->init) |
| 2263 | t->init(tr); |
| 2264 | |
| 2265 | out: |
| 2266 | mutex_unlock(&trace_types_lock); |
| 2267 | |
| 2268 | filp->f_pos += cnt; |
| 2269 | |
| 2270 | return cnt; |
| 2271 | } |
| 2272 | |
| 2273 | static ssize_t |
| 2274 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2275 | size_t cnt, loff_t *ppos) |
| 2276 | { |
| 2277 | unsigned long *ptr = filp->private_data; |
| 2278 | char buf[64]; |
| 2279 | int r; |
| 2280 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2281 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2282 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2283 | if (r > sizeof(buf)) |
| 2284 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2285 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2286 | } |
| 2287 | |
| 2288 | static ssize_t |
| 2289 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2290 | size_t cnt, loff_t *ppos) |
| 2291 | { |
| 2292 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2293 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2294 | long val; |
| 2295 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2296 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2297 | if (cnt >= sizeof(buf)) |
| 2298 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2299 | |
| 2300 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2301 | return -EFAULT; |
| 2302 | |
| 2303 | buf[cnt] = 0; |
| 2304 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2305 | ret = strict_strtoul(buf, 10, &val); |
| 2306 | if (ret < 0) |
| 2307 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2308 | |
| 2309 | *ptr = val * 1000; |
| 2310 | |
| 2311 | return cnt; |
| 2312 | } |
| 2313 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2314 | static atomic_t tracing_reader; |
| 2315 | |
| 2316 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2317 | { |
| 2318 | struct trace_iterator *iter; |
| 2319 | |
| 2320 | if (tracing_disabled) |
| 2321 | return -ENODEV; |
| 2322 | |
| 2323 | /* We only allow for reader of the pipe */ |
| 2324 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2325 | atomic_dec(&tracing_reader); |
| 2326 | return -EBUSY; |
| 2327 | } |
| 2328 | |
| 2329 | /* create a buffer to store the information to pass to userspace */ |
| 2330 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2331 | if (!iter) |
| 2332 | return -ENOMEM; |
| 2333 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2334 | mutex_lock(&trace_types_lock); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2335 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2336 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2337 | filp->private_data = iter; |
| 2338 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2339 | if (iter->trace->pipe_open) |
| 2340 | iter->trace->pipe_open(iter); |
| 2341 | mutex_unlock(&trace_types_lock); |
| 2342 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2343 | return 0; |
| 2344 | } |
| 2345 | |
| 2346 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2347 | { |
| 2348 | struct trace_iterator *iter = file->private_data; |
| 2349 | |
| 2350 | kfree(iter); |
| 2351 | atomic_dec(&tracing_reader); |
| 2352 | |
| 2353 | return 0; |
| 2354 | } |
| 2355 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2356 | static unsigned int |
| 2357 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2358 | { |
| 2359 | struct trace_iterator *iter = filp->private_data; |
| 2360 | |
| 2361 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2362 | /* |
| 2363 | * Always select as readable when in blocking mode |
| 2364 | */ |
| 2365 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2366 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2367 | if (!trace_empty(iter)) |
| 2368 | return POLLIN | POLLRDNORM; |
| 2369 | poll_wait(filp, &trace_wait, poll_table); |
| 2370 | if (!trace_empty(iter)) |
| 2371 | return POLLIN | POLLRDNORM; |
| 2372 | |
| 2373 | return 0; |
| 2374 | } |
| 2375 | } |
| 2376 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2377 | /* |
| 2378 | * Consumer reader. |
| 2379 | */ |
| 2380 | static ssize_t |
| 2381 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2382 | size_t cnt, loff_t *ppos) |
| 2383 | { |
| 2384 | struct trace_iterator *iter = filp->private_data; |
| 2385 | struct trace_array_cpu *data; |
| 2386 | static cpumask_t mask; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2387 | unsigned long flags; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2388 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2389 | int ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2390 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2391 | int cpu; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2392 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2393 | |
| 2394 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2395 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2396 | if (sret != -EBUSY) |
| 2397 | return sret; |
| 2398 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2399 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2400 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2401 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2402 | mutex_lock(&trace_types_lock); |
| 2403 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2404 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2405 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2406 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2407 | } |
| 2408 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2409 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2410 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2411 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2412 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2413 | goto out; |
| 2414 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2415 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2416 | /* |
| 2417 | * This is a make-shift waitqueue. The reason we don't use |
| 2418 | * an actual wait queue is because: |
| 2419 | * 1) we only ever have one waiter |
| 2420 | * 2) the tracing, traces all functions, we don't want |
| 2421 | * the overhead of calling wake_up and friends |
| 2422 | * (and tracing them too) |
| 2423 | * Anyway, this is really very primitive wakeup. |
| 2424 | */ |
| 2425 | set_current_state(TASK_INTERRUPTIBLE); |
| 2426 | iter->tr->waiter = current; |
| 2427 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2428 | mutex_unlock(&trace_types_lock); |
| 2429 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2430 | /* sleep for 100 msecs, and try again. */ |
| 2431 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2432 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2433 | mutex_lock(&trace_types_lock); |
| 2434 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2435 | iter->tr->waiter = NULL; |
| 2436 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2437 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2438 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2439 | goto out; |
| 2440 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2441 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2442 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2443 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2444 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2445 | /* |
| 2446 | * We block until we read something and tracing is disabled. |
| 2447 | * We still block if tracing is disabled, but we have never |
| 2448 | * read anything. This allows a user to cat this file, and |
| 2449 | * then enable tracing. But after we have read something, |
| 2450 | * we give an EOF when tracing is again disabled. |
| 2451 | * |
| 2452 | * iter->pos will be 0 if we haven't read anything. |
| 2453 | */ |
| 2454 | if (!tracer_enabled && iter->pos) |
| 2455 | break; |
| 2456 | |
| 2457 | continue; |
| 2458 | } |
| 2459 | |
| 2460 | /* stop when tracing is finished */ |
| 2461 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2462 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2463 | |
| 2464 | if (cnt >= PAGE_SIZE) |
| 2465 | cnt = PAGE_SIZE - 1; |
| 2466 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2467 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2468 | memset(&iter->seq, 0, |
| 2469 | sizeof(struct trace_iterator) - |
| 2470 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2471 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2472 | |
| 2473 | /* |
| 2474 | * We need to stop all tracing on all CPUS to read the |
| 2475 | * the next buffer. This is a bit expensive, but is |
| 2476 | * not done often. We fill all what we can read, |
| 2477 | * and then release the locks again. |
| 2478 | */ |
| 2479 | |
| 2480 | cpus_clear(mask); |
| 2481 | local_irq_save(flags); |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2482 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2483 | ftrace_save = ftrace_enabled; |
| 2484 | ftrace_enabled = 0; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2485 | #endif |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2486 | smp_wmb(); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2487 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2488 | data = iter->tr->data[cpu]; |
| 2489 | |
| 2490 | if (!head_page(data) || !data->trace_idx) |
| 2491 | continue; |
| 2492 | |
| 2493 | atomic_inc(&data->disabled); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2494 | cpu_set(cpu, mask); |
| 2495 | } |
| 2496 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2497 | for_each_cpu_mask(cpu, mask) { |
| 2498 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2499 | __raw_spin_lock(&data->lock); |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2500 | |
| 2501 | if (data->overrun > iter->last_overrun[cpu]) |
| 2502 | iter->overrun[cpu] += |
| 2503 | data->overrun - iter->last_overrun[cpu]; |
| 2504 | iter->last_overrun[cpu] = data->overrun; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2505 | } |
| 2506 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2507 | while (find_next_entry_inc(iter) != NULL) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2508 | int ret; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2509 | int len = iter->seq.len; |
| 2510 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2511 | ret = print_trace_line(iter); |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2512 | if (!ret) { |
| 2513 | /* don't print partial lines */ |
| 2514 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2515 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2516 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2517 | |
| 2518 | trace_consume(iter); |
| 2519 | |
| 2520 | if (iter->seq.len >= cnt) |
| 2521 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2522 | } |
| 2523 | |
Ingo Molnar | d4c5a2f | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2524 | for_each_cpu_mask(cpu, mask) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2525 | data = iter->tr->data[cpu]; |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2526 | __raw_spin_unlock(&data->lock); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2527 | } |
| 2528 | |
| 2529 | for_each_cpu_mask(cpu, mask) { |
| 2530 | data = iter->tr->data[cpu]; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2531 | atomic_dec(&data->disabled); |
| 2532 | } |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2533 | #ifdef CONFIG_FTRACE |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2534 | ftrace_enabled = ftrace_save; |
Ingo Molnar | 2577046 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2535 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2536 | local_irq_restore(flags); |
| 2537 | |
| 2538 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2539 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2540 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2541 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2542 | if (sret == -EBUSY) |
| 2543 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2544 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2545 | out: |
| 2546 | mutex_unlock(&trace_types_lock); |
| 2547 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2548 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2549 | } |
| 2550 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2551 | static ssize_t |
| 2552 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2553 | size_t cnt, loff_t *ppos) |
| 2554 | { |
| 2555 | struct trace_array *tr = filp->private_data; |
| 2556 | char buf[64]; |
| 2557 | int r; |
| 2558 | |
| 2559 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2560 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2561 | } |
| 2562 | |
| 2563 | static ssize_t |
| 2564 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2565 | size_t cnt, loff_t *ppos) |
| 2566 | { |
| 2567 | unsigned long val; |
| 2568 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2569 | int ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2570 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2571 | if (cnt >= sizeof(buf)) |
| 2572 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2573 | |
| 2574 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2575 | return -EFAULT; |
| 2576 | |
| 2577 | buf[cnt] = 0; |
| 2578 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2579 | ret = strict_strtoul(buf, 10, &val); |
| 2580 | if (ret < 0) |
| 2581 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2582 | |
| 2583 | /* must have at least 1 entry */ |
| 2584 | if (!val) |
| 2585 | return -EINVAL; |
| 2586 | |
| 2587 | mutex_lock(&trace_types_lock); |
| 2588 | |
| 2589 | if (current_trace != &no_tracer) { |
| 2590 | cnt = -EBUSY; |
| 2591 | pr_info("ftrace: set current_tracer to none" |
| 2592 | " before modifying buffer size\n"); |
| 2593 | goto out; |
| 2594 | } |
| 2595 | |
| 2596 | if (val > global_trace.entries) { |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2597 | long pages_requested; |
| 2598 | unsigned long freeable_pages; |
| 2599 | |
| 2600 | /* make sure we have enough memory before mapping */ |
| 2601 | pages_requested = |
| 2602 | (val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE; |
| 2603 | |
| 2604 | /* account for each buffer (and max_tr) */ |
| 2605 | pages_requested *= tracing_nr_buffers * 2; |
| 2606 | |
| 2607 | /* Check for overflow */ |
| 2608 | if (pages_requested < 0) { |
| 2609 | cnt = -ENOMEM; |
| 2610 | goto out; |
| 2611 | } |
| 2612 | |
| 2613 | freeable_pages = determine_dirtyable_memory(); |
| 2614 | |
| 2615 | /* we only allow to request 1/4 of useable memory */ |
| 2616 | if (pages_requested > |
| 2617 | ((freeable_pages + tracing_pages_allocated) / 4)) { |
| 2618 | cnt = -ENOMEM; |
| 2619 | goto out; |
| 2620 | } |
| 2621 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2622 | while (global_trace.entries < val) { |
| 2623 | if (trace_alloc_page()) { |
| 2624 | cnt = -ENOMEM; |
| 2625 | goto out; |
| 2626 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2627 | /* double check that we don't go over the known pages */ |
| 2628 | if (tracing_pages_allocated > pages_requested) |
| 2629 | break; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2630 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2631 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2632 | } else { |
| 2633 | /* include the number of entries in val (inc of page entries) */ |
| 2634 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) |
| 2635 | trace_free_page(); |
| 2636 | } |
| 2637 | |
| 2638 | filp->f_pos += cnt; |
| 2639 | |
| 2640 | out: |
| 2641 | max_tr.entries = global_trace.entries; |
| 2642 | mutex_unlock(&trace_types_lock); |
| 2643 | |
| 2644 | return cnt; |
| 2645 | } |
| 2646 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2647 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2648 | .open = tracing_open_generic, |
| 2649 | .read = tracing_max_lat_read, |
| 2650 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2651 | }; |
| 2652 | |
| 2653 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2654 | .open = tracing_open_generic, |
| 2655 | .read = tracing_ctrl_read, |
| 2656 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2657 | }; |
| 2658 | |
| 2659 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2660 | .open = tracing_open_generic, |
| 2661 | .read = tracing_set_trace_read, |
| 2662 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2663 | }; |
| 2664 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2665 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2666 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2667 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2668 | .read = tracing_read_pipe, |
| 2669 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2670 | }; |
| 2671 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2672 | static struct file_operations tracing_entries_fops = { |
| 2673 | .open = tracing_open_generic, |
| 2674 | .read = tracing_entries_read, |
| 2675 | .write = tracing_entries_write, |
| 2676 | }; |
| 2677 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2678 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2679 | |
| 2680 | static ssize_t |
| 2681 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2682 | size_t cnt, loff_t *ppos) |
| 2683 | { |
| 2684 | unsigned long *p = filp->private_data; |
| 2685 | char buf[64]; |
| 2686 | int r; |
| 2687 | |
| 2688 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2689 | |
| 2690 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2691 | } |
| 2692 | |
| 2693 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2694 | .open = tracing_open_generic, |
| 2695 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2696 | }; |
| 2697 | #endif |
| 2698 | |
| 2699 | static struct dentry *d_tracer; |
| 2700 | |
| 2701 | struct dentry *tracing_init_dentry(void) |
| 2702 | { |
| 2703 | static int once; |
| 2704 | |
| 2705 | if (d_tracer) |
| 2706 | return d_tracer; |
| 2707 | |
| 2708 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2709 | |
| 2710 | if (!d_tracer && !once) { |
| 2711 | once = 1; |
| 2712 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2713 | return NULL; |
| 2714 | } |
| 2715 | |
| 2716 | return d_tracer; |
| 2717 | } |
| 2718 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2719 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2720 | /* Let selftest have access to static functions in this file */ |
| 2721 | #include "trace_selftest.c" |
| 2722 | #endif |
| 2723 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2724 | static __init void tracer_init_debugfs(void) |
| 2725 | { |
| 2726 | struct dentry *d_tracer; |
| 2727 | struct dentry *entry; |
| 2728 | |
| 2729 | d_tracer = tracing_init_dentry(); |
| 2730 | |
| 2731 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2732 | &global_trace, &tracing_ctrl_fops); |
| 2733 | if (!entry) |
| 2734 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2735 | |
| 2736 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2737 | NULL, &tracing_iter_fops); |
| 2738 | if (!entry) |
| 2739 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2740 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2741 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 2742 | NULL, &tracing_cpumask_fops); |
| 2743 | if (!entry) |
| 2744 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 2745 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2746 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2747 | &global_trace, &tracing_lt_fops); |
| 2748 | if (!entry) |
| 2749 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2750 | |
| 2751 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2752 | &global_trace, &tracing_fops); |
| 2753 | if (!entry) |
| 2754 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2755 | |
| 2756 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2757 | &global_trace, &show_traces_fops); |
| 2758 | if (!entry) |
| 2759 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2760 | |
| 2761 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2762 | &global_trace, &set_tracer_fops); |
| 2763 | if (!entry) |
| 2764 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2765 | |
| 2766 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2767 | &tracing_max_latency, |
| 2768 | &tracing_max_lat_fops); |
| 2769 | if (!entry) |
| 2770 | pr_warning("Could not create debugfs " |
| 2771 | "'tracing_max_latency' entry\n"); |
| 2772 | |
| 2773 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2774 | &tracing_thresh, &tracing_max_lat_fops); |
| 2775 | if (!entry) |
| 2776 | pr_warning("Could not create debugfs " |
| 2777 | "'tracing_threash' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2778 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2779 | NULL, &tracing_readme_fops); |
| 2780 | if (!entry) |
| 2781 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2782 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2783 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2784 | NULL, &tracing_pipe_fops); |
| 2785 | if (!entry) |
| 2786 | pr_warning("Could not create debugfs " |
| 2787 | "'tracing_threash' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2788 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2789 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 2790 | &global_trace, &tracing_entries_fops); |
| 2791 | if (!entry) |
| 2792 | pr_warning("Could not create debugfs " |
| 2793 | "'tracing_threash' entry\n"); |
| 2794 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2795 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2796 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2797 | &ftrace_update_tot_cnt, |
| 2798 | &tracing_read_long_fops); |
| 2799 | if (!entry) |
| 2800 | pr_warning("Could not create debugfs " |
| 2801 | "'dyn_ftrace_total_info' entry\n"); |
| 2802 | #endif |
| 2803 | } |
| 2804 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2805 | static int trace_alloc_page(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2806 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2807 | struct trace_array_cpu *data; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2808 | struct page *page, *tmp; |
| 2809 | LIST_HEAD(pages); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2810 | void *array; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2811 | unsigned pages_allocated = 0; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2812 | int i; |
| 2813 | |
| 2814 | /* first allocate a page for each CPU */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2815 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2816 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2817 | if (array == NULL) { |
| 2818 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2819 | "for trace buffer!\n"); |
| 2820 | goto free_pages; |
| 2821 | } |
| 2822 | |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2823 | pages_allocated++; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2824 | page = virt_to_page(array); |
| 2825 | list_add(&page->lru, &pages); |
| 2826 | |
| 2827 | /* Only allocate if we are actually using the max trace */ |
| 2828 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2829 | array = (void *)__get_free_page(GFP_KERNEL); |
| 2830 | if (array == NULL) { |
| 2831 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2832 | "for trace buffer!\n"); |
| 2833 | goto free_pages; |
| 2834 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2835 | pages_allocated++; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2836 | page = virt_to_page(array); |
| 2837 | list_add(&page->lru, &pages); |
| 2838 | #endif |
| 2839 | } |
| 2840 | |
| 2841 | /* Now that we successfully allocate a page per CPU, add them */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2842 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2843 | data = global_trace.data[i]; |
| 2844 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2845 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2846 | list_add_tail(&page->lru, &data->trace_pages); |
| 2847 | ClearPageLRU(page); |
| 2848 | |
| 2849 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2850 | data = max_tr.data[i]; |
| 2851 | page = list_entry(pages.next, struct page, lru); |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2852 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2853 | list_add_tail(&page->lru, &data->trace_pages); |
| 2854 | SetPageLRU(page); |
| 2855 | #endif |
| 2856 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2857 | tracing_pages_allocated += pages_allocated; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2858 | global_trace.entries += ENTRIES_PER_PAGE; |
| 2859 | |
| 2860 | return 0; |
| 2861 | |
| 2862 | free_pages: |
| 2863 | list_for_each_entry_safe(page, tmp, &pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2864 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2865 | __free_page(page); |
| 2866 | } |
| 2867 | return -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2868 | } |
| 2869 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2870 | static int trace_free_page(void) |
| 2871 | { |
| 2872 | struct trace_array_cpu *data; |
| 2873 | struct page *page; |
| 2874 | struct list_head *p; |
| 2875 | int i; |
| 2876 | int ret = 0; |
| 2877 | |
| 2878 | /* free one page from each buffer */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2879 | for_each_tracing_cpu(i) { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2880 | data = global_trace.data[i]; |
| 2881 | p = data->trace_pages.next; |
| 2882 | if (p == &data->trace_pages) { |
| 2883 | /* should never happen */ |
| 2884 | WARN_ON(1); |
| 2885 | tracing_disabled = 1; |
| 2886 | ret = -1; |
| 2887 | break; |
| 2888 | } |
| 2889 | page = list_entry(p, struct page, lru); |
| 2890 | ClearPageLRU(page); |
| 2891 | list_del(&page->lru); |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame^] | 2892 | tracing_pages_allocated--; |
| 2893 | tracing_pages_allocated--; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2894 | __free_page(page); |
| 2895 | |
| 2896 | tracing_reset(data); |
| 2897 | |
| 2898 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 2899 | data = max_tr.data[i]; |
| 2900 | p = data->trace_pages.next; |
| 2901 | if (p == &data->trace_pages) { |
| 2902 | /* should never happen */ |
| 2903 | WARN_ON(1); |
| 2904 | tracing_disabled = 1; |
| 2905 | ret = -1; |
| 2906 | break; |
| 2907 | } |
| 2908 | page = list_entry(p, struct page, lru); |
| 2909 | ClearPageLRU(page); |
| 2910 | list_del(&page->lru); |
| 2911 | __free_page(page); |
| 2912 | |
| 2913 | tracing_reset(data); |
| 2914 | #endif |
| 2915 | } |
| 2916 | global_trace.entries -= ENTRIES_PER_PAGE; |
| 2917 | |
| 2918 | return ret; |
| 2919 | } |
| 2920 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2921 | __init static int tracer_alloc_buffers(void) |
| 2922 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2923 | struct trace_array_cpu *data; |
| 2924 | void *array; |
| 2925 | struct page *page; |
| 2926 | int pages = 0; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2927 | int ret = -ENOMEM; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2928 | int i; |
| 2929 | |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2930 | global_trace.ctrl = tracer_enabled; |
| 2931 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2932 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
| 2933 | tracing_nr_buffers = num_possible_cpus(); |
| 2934 | tracing_buffer_mask = cpu_possible_map; |
| 2935 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2936 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2937 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2938 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2939 | max_tr.data[i] = &per_cpu(max_data, i); |
| 2940 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2941 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2942 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2943 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2944 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2945 | goto free_buffers; |
| 2946 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2947 | |
| 2948 | /* set the array to the list */ |
| 2949 | INIT_LIST_HEAD(&data->trace_pages); |
| 2950 | page = virt_to_page(array); |
| 2951 | list_add(&page->lru, &data->trace_pages); |
| 2952 | /* use the LRU flag to differentiate the two buffers */ |
| 2953 | ClearPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2954 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2955 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 2956 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
| 2957 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2958 | /* Only allocate if we are actually using the max trace */ |
| 2959 | #ifdef CONFIG_TRACER_MAX_TRACE |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2960 | array = (void *)__get_free_page(GFP_KERNEL); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2961 | if (array == NULL) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2962 | printk(KERN_ERR "tracer: failed to allocate page" |
| 2963 | "for trace buffer!\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2964 | goto free_buffers; |
| 2965 | } |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2966 | |
| 2967 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); |
| 2968 | page = virt_to_page(array); |
| 2969 | list_add(&page->lru, &max_tr.data[i]->trace_pages); |
| 2970 | SetPageLRU(page); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2971 | #endif |
| 2972 | } |
| 2973 | |
| 2974 | /* |
| 2975 | * Since we allocate by orders of pages, we may be able to |
| 2976 | * round up a bit. |
| 2977 | */ |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2978 | global_trace.entries = ENTRIES_PER_PAGE; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2979 | pages++; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2980 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2981 | while (global_trace.entries < trace_nr_entries) { |
| 2982 | if (trace_alloc_page()) |
| 2983 | break; |
| 2984 | pages++; |
| 2985 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2986 | max_tr.entries = global_trace.entries; |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 2987 | |
| 2988 | pr_info("tracer: %d pages allocated for %ld", |
| 2989 | pages, trace_nr_entries); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2990 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
| 2991 | pr_info(" actual entries %ld\n", global_trace.entries); |
| 2992 | |
| 2993 | tracer_init_debugfs(); |
| 2994 | |
| 2995 | trace_init_cmdlines(); |
| 2996 | |
| 2997 | register_tracer(&no_tracer); |
| 2998 | current_trace = &no_tracer; |
| 2999 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3000 | /* All seems OK, enable tracing */ |
| 3001 | tracing_disabled = 0; |
| 3002 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3003 | return 0; |
| 3004 | |
| 3005 | free_buffers: |
| 3006 | for (i-- ; i >= 0; i--) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3007 | struct page *page, *tmp; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3008 | struct trace_array_cpu *data = global_trace.data[i]; |
| 3009 | |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3010 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3011 | list_for_each_entry_safe(page, tmp, |
| 3012 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3013 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3014 | __free_page(page); |
| 3015 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3016 | } |
| 3017 | |
| 3018 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3019 | data = max_tr.data[i]; |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3020 | if (data) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3021 | list_for_each_entry_safe(page, tmp, |
| 3022 | &data->trace_pages, lru) { |
Ingo Molnar | c7aafc5 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 3023 | list_del_init(&page->lru); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3024 | __free_page(page); |
| 3025 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3026 | } |
| 3027 | #endif |
| 3028 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3029 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3030 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3031 | fs_initcall(tracer_alloc_buffers); |