Arnaldo Carvalho de Melo | b0a7d1a | 2012-10-06 16:26:02 -0300 | [diff] [blame^] | 1 | #include "debug.h" |
| 2 | #include "event.h" |
Arnaldo Carvalho de Melo | 9d2f8e2 | 2012-10-06 15:43:20 -0300 | [diff] [blame] | 3 | #include "machine.h" |
| 4 | #include "map.h" |
| 5 | #include "thread.h" |
| 6 | #include <stdbool.h> |
| 7 | |
| 8 | static struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, |
| 9 | bool create) |
| 10 | { |
| 11 | struct rb_node **p = &machine->threads.rb_node; |
| 12 | struct rb_node *parent = NULL; |
| 13 | struct thread *th; |
| 14 | |
| 15 | /* |
| 16 | * Font-end cache - PID lookups come in blocks, |
| 17 | * so most of the time we dont have to look up |
| 18 | * the full rbtree: |
| 19 | */ |
| 20 | if (machine->last_match && machine->last_match->pid == pid) |
| 21 | return machine->last_match; |
| 22 | |
| 23 | while (*p != NULL) { |
| 24 | parent = *p; |
| 25 | th = rb_entry(parent, struct thread, rb_node); |
| 26 | |
| 27 | if (th->pid == pid) { |
| 28 | machine->last_match = th; |
| 29 | return th; |
| 30 | } |
| 31 | |
| 32 | if (pid < th->pid) |
| 33 | p = &(*p)->rb_left; |
| 34 | else |
| 35 | p = &(*p)->rb_right; |
| 36 | } |
| 37 | |
| 38 | if (!create) |
| 39 | return NULL; |
| 40 | |
| 41 | th = thread__new(pid); |
| 42 | if (th != NULL) { |
| 43 | rb_link_node(&th->rb_node, parent, p); |
| 44 | rb_insert_color(&th->rb_node, &machine->threads); |
| 45 | machine->last_match = th; |
| 46 | } |
| 47 | |
| 48 | return th; |
| 49 | } |
| 50 | |
| 51 | struct thread *machine__findnew_thread(struct machine *machine, pid_t pid) |
| 52 | { |
| 53 | return __machine__findnew_thread(machine, pid, true); |
| 54 | } |
| 55 | |
| 56 | struct thread *machine__find_thread(struct machine *machine, pid_t pid) |
| 57 | { |
| 58 | return __machine__findnew_thread(machine, pid, false); |
| 59 | } |
Arnaldo Carvalho de Melo | b0a7d1a | 2012-10-06 16:26:02 -0300 | [diff] [blame^] | 60 | |
| 61 | int machine__process_comm_event(struct machine *machine, union perf_event *event) |
| 62 | { |
| 63 | struct thread *thread = machine__findnew_thread(machine, event->comm.tid); |
| 64 | |
| 65 | if (dump_trace) |
| 66 | perf_event__fprintf_comm(event, stdout); |
| 67 | |
| 68 | if (thread == NULL || thread__set_comm(thread, event->comm.comm)) { |
| 69 | dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n"); |
| 70 | return -1; |
| 71 | } |
| 72 | |
| 73 | return 0; |
| 74 | } |
| 75 | |
| 76 | int machine__process_lost_event(struct machine *machine __maybe_unused, |
| 77 | union perf_event *event) |
| 78 | { |
| 79 | dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n", |
| 80 | event->lost.id, event->lost.lost); |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static void machine__set_kernel_mmap_len(struct machine *machine, |
| 85 | union perf_event *event) |
| 86 | { |
| 87 | machine->vmlinux_maps[MAP__FUNCTION]->start = event->mmap.start; |
| 88 | machine->vmlinux_maps[MAP__FUNCTION]->end = (event->mmap.start + |
| 89 | event->mmap.len); |
| 90 | /* |
| 91 | * Be a bit paranoid here, some perf.data file came with |
| 92 | * a zero sized synthesized MMAP event for the kernel. |
| 93 | */ |
| 94 | if (machine->vmlinux_maps[MAP__FUNCTION]->end == 0) |
| 95 | machine->vmlinux_maps[MAP__FUNCTION]->end = ~0ULL; |
| 96 | } |
| 97 | |
| 98 | static int machine__process_kernel_mmap_event(struct machine *machine, |
| 99 | union perf_event *event) |
| 100 | { |
| 101 | struct map *map; |
| 102 | char kmmap_prefix[PATH_MAX]; |
| 103 | enum dso_kernel_type kernel_type; |
| 104 | bool is_kernel_mmap; |
| 105 | |
| 106 | machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix)); |
| 107 | if (machine__is_host(machine)) |
| 108 | kernel_type = DSO_TYPE_KERNEL; |
| 109 | else |
| 110 | kernel_type = DSO_TYPE_GUEST_KERNEL; |
| 111 | |
| 112 | is_kernel_mmap = memcmp(event->mmap.filename, |
| 113 | kmmap_prefix, |
| 114 | strlen(kmmap_prefix) - 1) == 0; |
| 115 | if (event->mmap.filename[0] == '/' || |
| 116 | (!is_kernel_mmap && event->mmap.filename[0] == '[')) { |
| 117 | |
| 118 | char short_module_name[1024]; |
| 119 | char *name, *dot; |
| 120 | |
| 121 | if (event->mmap.filename[0] == '/') { |
| 122 | name = strrchr(event->mmap.filename, '/'); |
| 123 | if (name == NULL) |
| 124 | goto out_problem; |
| 125 | |
| 126 | ++name; /* skip / */ |
| 127 | dot = strrchr(name, '.'); |
| 128 | if (dot == NULL) |
| 129 | goto out_problem; |
| 130 | snprintf(short_module_name, sizeof(short_module_name), |
| 131 | "[%.*s]", (int)(dot - name), name); |
| 132 | strxfrchar(short_module_name, '-', '_'); |
| 133 | } else |
| 134 | strcpy(short_module_name, event->mmap.filename); |
| 135 | |
| 136 | map = machine__new_module(machine, event->mmap.start, |
| 137 | event->mmap.filename); |
| 138 | if (map == NULL) |
| 139 | goto out_problem; |
| 140 | |
| 141 | name = strdup(short_module_name); |
| 142 | if (name == NULL) |
| 143 | goto out_problem; |
| 144 | |
| 145 | map->dso->short_name = name; |
| 146 | map->dso->sname_alloc = 1; |
| 147 | map->end = map->start + event->mmap.len; |
| 148 | } else if (is_kernel_mmap) { |
| 149 | const char *symbol_name = (event->mmap.filename + |
| 150 | strlen(kmmap_prefix)); |
| 151 | /* |
| 152 | * Should be there already, from the build-id table in |
| 153 | * the header. |
| 154 | */ |
| 155 | struct dso *kernel = __dsos__findnew(&machine->kernel_dsos, |
| 156 | kmmap_prefix); |
| 157 | if (kernel == NULL) |
| 158 | goto out_problem; |
| 159 | |
| 160 | kernel->kernel = kernel_type; |
| 161 | if (__machine__create_kernel_maps(machine, kernel) < 0) |
| 162 | goto out_problem; |
| 163 | |
| 164 | machine__set_kernel_mmap_len(machine, event); |
| 165 | |
| 166 | /* |
| 167 | * Avoid using a zero address (kptr_restrict) for the ref reloc |
| 168 | * symbol. Effectively having zero here means that at record |
| 169 | * time /proc/sys/kernel/kptr_restrict was non zero. |
| 170 | */ |
| 171 | if (event->mmap.pgoff != 0) { |
| 172 | maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, |
| 173 | symbol_name, |
| 174 | event->mmap.pgoff); |
| 175 | } |
| 176 | |
| 177 | if (machine__is_default_guest(machine)) { |
| 178 | /* |
| 179 | * preload dso of guest kernel and modules |
| 180 | */ |
| 181 | dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION], |
| 182 | NULL); |
| 183 | } |
| 184 | } |
| 185 | return 0; |
| 186 | out_problem: |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | int machine__process_mmap_event(struct machine *machine, union perf_event *event) |
| 191 | { |
| 192 | u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; |
| 193 | struct thread *thread; |
| 194 | struct map *map; |
| 195 | int ret = 0; |
| 196 | |
| 197 | if (dump_trace) |
| 198 | perf_event__fprintf_mmap(event, stdout); |
| 199 | |
| 200 | if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL || |
| 201 | cpumode == PERF_RECORD_MISC_KERNEL) { |
| 202 | ret = machine__process_kernel_mmap_event(machine, event); |
| 203 | if (ret < 0) |
| 204 | goto out_problem; |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | thread = machine__findnew_thread(machine, event->mmap.pid); |
| 209 | if (thread == NULL) |
| 210 | goto out_problem; |
| 211 | map = map__new(&machine->user_dsos, event->mmap.start, |
| 212 | event->mmap.len, event->mmap.pgoff, |
| 213 | event->mmap.pid, event->mmap.filename, |
| 214 | MAP__FUNCTION); |
| 215 | if (map == NULL) |
| 216 | goto out_problem; |
| 217 | |
| 218 | thread__insert_map(thread, map); |
| 219 | return 0; |
| 220 | |
| 221 | out_problem: |
| 222 | dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n"); |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | int machine__process_fork_event(struct machine *machine, union perf_event *event) |
| 227 | { |
| 228 | struct thread *thread = machine__findnew_thread(machine, event->fork.tid); |
| 229 | struct thread *parent = machine__findnew_thread(machine, event->fork.ptid); |
| 230 | |
| 231 | if (dump_trace) |
| 232 | perf_event__fprintf_task(event, stdout); |
| 233 | |
| 234 | if (thread == NULL || parent == NULL || |
| 235 | thread__fork(thread, parent) < 0) { |
| 236 | dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n"); |
| 237 | return -1; |
| 238 | } |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | int machine__process_exit_event(struct machine *machine, union perf_event *event) |
| 244 | { |
| 245 | struct thread *thread = machine__find_thread(machine, event->fork.tid); |
| 246 | |
| 247 | if (dump_trace) |
| 248 | perf_event__fprintf_task(event, stdout); |
| 249 | |
| 250 | if (thread != NULL) |
| 251 | machine__remove_thread(machine, thread); |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | int machine__process_event(struct machine *machine, union perf_event *event) |
| 257 | { |
| 258 | int ret; |
| 259 | |
| 260 | switch (event->header.type) { |
| 261 | case PERF_RECORD_COMM: |
| 262 | ret = machine__process_comm_event(machine, event); break; |
| 263 | case PERF_RECORD_MMAP: |
| 264 | ret = machine__process_mmap_event(machine, event); break; |
| 265 | case PERF_RECORD_FORK: |
| 266 | ret = machine__process_fork_event(machine, event); break; |
| 267 | case PERF_RECORD_EXIT: |
| 268 | ret = machine__process_exit_event(machine, event); break; |
| 269 | case PERF_RECORD_LOST: |
| 270 | ret = machine__process_lost_event(machine, event); break; |
| 271 | default: |
| 272 | ret = -1; |
| 273 | break; |
| 274 | } |
| 275 | |
| 276 | return ret; |
| 277 | } |