perf tools: Resolve idle thread cmdline for perf trace
[linux-2.6.git] / tools / perf / builtin-trace.c
1 #include "builtin.h"
2
3 #include "util/util.h"
4 #include "util/cache.h"
5 #include "util/symbol.h"
6 #include "util/thread.h"
7 #include "util/header.h"
8
9 #include "util/parse-options.h"
10
11 #include "perf.h"
12 #include "util/debug.h"
13
14 #include "util/trace-event.h"
15
16 static char             const *input_name = "perf.data";
17 static int              input;
18 static unsigned long    page_size;
19 static unsigned long    mmap_window = 32;
20
21 static unsigned long    total = 0;
22 static unsigned long    total_comm = 0;
23
24 static struct rb_root   threads;
25 static struct thread    *last_match;
26
27 static struct perf_header *header;
28 static u64              sample_type;
29
30
31 static int
32 process_comm_event(event_t *event, unsigned long offset, unsigned long head)
33 {
34         struct thread *thread;
35
36         thread = threads__findnew(event->comm.pid, &threads, &last_match);
37
38         dump_printf("%p [%p]: PERF_EVENT_COMM: %s:%d\n",
39                 (void *)(offset + head),
40                 (void *)(long)(event->header.size),
41                 event->comm.comm, event->comm.pid);
42
43         if (thread == NULL ||
44             thread__set_comm(thread, event->comm.comm)) {
45                 dump_printf("problem processing PERF_EVENT_COMM, skipping event.\n");
46                 return -1;
47         }
48         total_comm++;
49
50         return 0;
51 }
52
53 static int
54 process_sample_event(event_t *event, unsigned long offset, unsigned long head)
55 {
56         char level;
57         int show = 0;
58         struct dso *dso = NULL;
59         struct thread *thread;
60         u64 ip = event->ip.ip;
61         u64 period = 1;
62         void *more_data = event->ip.__more_data;
63         int cpumode;
64
65         thread = threads__findnew(event->ip.pid, &threads, &last_match);
66
67         if (sample_type & PERF_SAMPLE_PERIOD) {
68                 period = *(u64 *)more_data;
69                 more_data += sizeof(u64);
70         }
71
72         dump_printf("%p [%p]: PERF_EVENT_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
73                 (void *)(offset + head),
74                 (void *)(long)(event->header.size),
75                 event->header.misc,
76                 event->ip.pid, event->ip.tid,
77                 (void *)(long)ip,
78                 (long long)period);
79
80         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
81
82         if (thread == NULL) {
83                 eprintf("problem processing %d event, skipping it.\n",
84                         event->header.type);
85                 return -1;
86         }
87
88         cpumode = event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK;
89
90         if (cpumode == PERF_EVENT_MISC_KERNEL) {
91                 show = SHOW_KERNEL;
92                 level = 'k';
93
94                 dso = kernel_dso;
95
96                 dump_printf(" ...... dso: %s\n", dso->name);
97
98         } else if (cpumode == PERF_EVENT_MISC_USER) {
99
100                 show = SHOW_USER;
101                 level = '.';
102
103         } else {
104                 show = SHOW_HV;
105                 level = 'H';
106
107                 dso = hypervisor_dso;
108
109                 dump_printf(" ...... dso: [hypervisor]\n");
110         }
111
112         if (sample_type & PERF_SAMPLE_RAW) {
113                 struct {
114                         u32 size;
115                         char data[0];
116                 } *raw = more_data;
117
118                 /*
119                  * FIXME: better resolve from pid from the struct trace_entry
120                  * field, although it should be the same than this perf
121                  * event pid
122                  */
123                 print_event(0, raw->data, raw->size, 0, thread->comm);
124         }
125         total += period;
126
127         return 0;
128 }
129
130 static int
131 process_event(event_t *event, unsigned long offset, unsigned long head)
132 {
133         trace_event(event);
134
135         switch (event->header.type) {
136         case PERF_EVENT_MMAP ... PERF_EVENT_LOST:
137                 return 0;
138
139         case PERF_EVENT_COMM:
140                 return process_comm_event(event, offset, head);
141
142         case PERF_EVENT_EXIT ... PERF_EVENT_READ:
143                 return 0;
144
145         case PERF_EVENT_SAMPLE:
146                 return process_sample_event(event, offset, head);
147
148         case PERF_EVENT_MAX:
149         default:
150                 return -1;
151         }
152
153         return 0;
154 }
155
156 static int __cmd_trace(void)
157 {
158         int ret, rc = EXIT_FAILURE;
159         unsigned long offset = 0;
160         unsigned long head = 0;
161         struct stat perf_stat;
162         event_t *event;
163         uint32_t size;
164         char *buf;
165
166         trace_report();
167         register_idle_thread(&threads, &last_match);
168
169         input = open(input_name, O_RDONLY);
170         if (input < 0) {
171                 perror("failed to open file");
172                 exit(-1);
173         }
174
175         ret = fstat(input, &perf_stat);
176         if (ret < 0) {
177                 perror("failed to stat file");
178                 exit(-1);
179         }
180
181         if (!perf_stat.st_size) {
182                 fprintf(stderr, "zero-sized file, nothing to do!\n");
183                 exit(0);
184         }
185         header = perf_header__read(input);
186         sample_type = perf_header__sample_type(header);
187
188         if (!(sample_type & PERF_SAMPLE_RAW))
189                 die("No trace sample to read. Did you call perf record "
190                     "without -R?");
191
192         if (load_kernel() < 0) {
193                 perror("failed to load kernel symbols");
194                 return EXIT_FAILURE;
195         }
196
197 remap:
198         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
199                            MAP_SHARED, input, offset);
200         if (buf == MAP_FAILED) {
201                 perror("failed to mmap file");
202                 exit(-1);
203         }
204
205 more:
206         event = (event_t *)(buf + head);
207
208         size = event->header.size;
209         if (!size)
210                 size = 8;
211
212         if (head + event->header.size >= page_size * mmap_window) {
213                 unsigned long shift = page_size * (head / page_size);
214                 int res;
215
216                 res = munmap(buf, page_size * mmap_window);
217                 assert(res == 0);
218
219                 offset += shift;
220                 head -= shift;
221                 goto remap;
222         }
223
224         size = event->header.size;
225
226
227         if (!size || process_event(event, offset, head) < 0) {
228
229                 /*
230                  * assume we lost track of the stream, check alignment, and
231                  * increment a single u64 in the hope to catch on again 'soon'.
232                  */
233
234                 if (unlikely(head & 7))
235                         head &= ~7ULL;
236
237                 size = 8;
238         }
239
240         head += size;
241
242         if (offset + head < (unsigned long)perf_stat.st_size)
243                 goto more;
244
245         rc = EXIT_SUCCESS;
246         close(input);
247
248         return rc;
249 }
250
251 static const char * const annotate_usage[] = {
252         "perf trace [<options>] <command>",
253         NULL
254 };
255
256 static const struct option options[] = {
257         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
258                     "dump raw trace in ASCII"),
259         OPT_BOOLEAN('v', "verbose", &verbose,
260                     "be more verbose (show symbol address, etc)"),
261         OPT_END()
262 };
263
264 int cmd_trace(int argc, const char **argv, const char *prefix __used)
265 {
266         symbol__init();
267         page_size = getpagesize();
268
269         argc = parse_options(argc, argv, options, annotate_usage, 0);
270         if (argc) {
271                 /*
272                  * Special case: if there's an argument left then assume tha
273                  * it's a symbol filter:
274                  */
275                 if (argc > 1)
276                         usage_with_options(annotate_usage, options);
277         }
278
279
280         setup_pager();
281
282         return __cmd_trace();
283 }