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Commit | Line | Data |
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36994e58 FW |
1 | /* |
2 | * Memory allocator tracing | |
3 | * | |
4 | * Copyright (C) 2008 Eduard - Gabriel Munteanu | |
5 | * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi> | |
6 | * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com> | |
7 | */ | |
8 | ||
c826e3cd IM |
9 | #include <linux/tracepoint.h> |
10 | #include <linux/seq_file.h> | |
36994e58 | 11 | #include <linux/debugfs.h> |
c826e3cd | 12 | #include <linux/dcache.h> |
36994e58 | 13 | #include <linux/fs.h> |
c826e3cd | 14 | |
02af61bb | 15 | #include <linux/kmemtrace.h> |
36994e58 | 16 | |
36994e58 | 17 | #include "trace_output.h" |
c826e3cd | 18 | #include "trace.h" |
36994e58 FW |
19 | |
20 | /* Select an alternative, minimalistic output than the original one */ | |
21 | #define TRACE_KMEM_OPT_MINIMAL 0x1 | |
22 | ||
23 | static struct tracer_opt kmem_opts[] = { | |
24 | /* Default disable the minimalistic output */ | |
25 | { TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) }, | |
26 | { } | |
27 | }; | |
28 | ||
29 | static struct tracer_flags kmem_tracer_flags = { | |
c826e3cd IM |
30 | .val = 0, |
31 | .opts = kmem_opts | |
36994e58 FW |
32 | }; |
33 | ||
36994e58 FW |
34 | static struct trace_array *kmemtrace_array; |
35 | ||
ca2b84cb EGM |
36 | /* Trace allocations */ |
37 | static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id, | |
38 | unsigned long call_site, | |
39 | const void *ptr, | |
40 | size_t bytes_req, | |
41 | size_t bytes_alloc, | |
42 | gfp_t gfp_flags, | |
43 | int node) | |
44 | { | |
e1112b4d | 45 | struct ftrace_event_call *call = &event_kmem_alloc; |
ca2b84cb | 46 | struct trace_array *tr = kmemtrace_array; |
c826e3cd IM |
47 | struct kmemtrace_alloc_entry *entry; |
48 | struct ring_buffer_event *event; | |
ca2b84cb EGM |
49 | |
50 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry)); | |
51 | if (!event) | |
52 | return; | |
c826e3cd IM |
53 | |
54 | entry = ring_buffer_event_data(event); | |
ca2b84cb EGM |
55 | tracing_generic_entry_update(&entry->ent, 0, 0); |
56 | ||
c826e3cd IM |
57 | entry->ent.type = TRACE_KMEM_ALLOC; |
58 | entry->type_id = type_id; | |
59 | entry->call_site = call_site; | |
60 | entry->ptr = ptr; | |
61 | entry->bytes_req = bytes_req; | |
62 | entry->bytes_alloc = bytes_alloc; | |
63 | entry->gfp_flags = gfp_flags; | |
64 | entry->node = node; | |
ca2b84cb | 65 | |
eb02ce01 TZ |
66 | if (!filter_check_discard(call, entry, tr->buffer, event)) |
67 | ring_buffer_unlock_commit(tr->buffer, event); | |
ca2b84cb EGM |
68 | |
69 | trace_wake_up(); | |
70 | } | |
71 | ||
72 | static inline void kmemtrace_free(enum kmemtrace_type_id type_id, | |
73 | unsigned long call_site, | |
74 | const void *ptr) | |
75 | { | |
e1112b4d | 76 | struct ftrace_event_call *call = &event_kmem_free; |
ca2b84cb | 77 | struct trace_array *tr = kmemtrace_array; |
c826e3cd IM |
78 | struct kmemtrace_free_entry *entry; |
79 | struct ring_buffer_event *event; | |
ca2b84cb EGM |
80 | |
81 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry)); | |
82 | if (!event) | |
83 | return; | |
84 | entry = ring_buffer_event_data(event); | |
85 | tracing_generic_entry_update(&entry->ent, 0, 0); | |
86 | ||
c826e3cd IM |
87 | entry->ent.type = TRACE_KMEM_FREE; |
88 | entry->type_id = type_id; | |
89 | entry->call_site = call_site; | |
90 | entry->ptr = ptr; | |
ca2b84cb | 91 | |
eb02ce01 TZ |
92 | if (!filter_check_discard(call, entry, tr->buffer, event)) |
93 | ring_buffer_unlock_commit(tr->buffer, event); | |
ca2b84cb EGM |
94 | |
95 | trace_wake_up(); | |
96 | } | |
97 | ||
38516ab5 SR |
98 | static void kmemtrace_kmalloc(void *ignore, |
99 | unsigned long call_site, | |
ca2b84cb EGM |
100 | const void *ptr, |
101 | size_t bytes_req, | |
102 | size_t bytes_alloc, | |
103 | gfp_t gfp_flags) | |
104 | { | |
105 | kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr, | |
106 | bytes_req, bytes_alloc, gfp_flags, -1); | |
107 | } | |
108 | ||
38516ab5 SR |
109 | static void kmemtrace_kmem_cache_alloc(void *ignore, |
110 | unsigned long call_site, | |
ca2b84cb EGM |
111 | const void *ptr, |
112 | size_t bytes_req, | |
113 | size_t bytes_alloc, | |
114 | gfp_t gfp_flags) | |
115 | { | |
116 | kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr, | |
117 | bytes_req, bytes_alloc, gfp_flags, -1); | |
118 | } | |
119 | ||
38516ab5 SR |
120 | static void kmemtrace_kmalloc_node(void *ignore, |
121 | unsigned long call_site, | |
ca2b84cb EGM |
122 | const void *ptr, |
123 | size_t bytes_req, | |
124 | size_t bytes_alloc, | |
125 | gfp_t gfp_flags, | |
126 | int node) | |
127 | { | |
128 | kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr, | |
129 | bytes_req, bytes_alloc, gfp_flags, node); | |
130 | } | |
131 | ||
38516ab5 SR |
132 | static void kmemtrace_kmem_cache_alloc_node(void *ignore, |
133 | unsigned long call_site, | |
ca2b84cb EGM |
134 | const void *ptr, |
135 | size_t bytes_req, | |
136 | size_t bytes_alloc, | |
137 | gfp_t gfp_flags, | |
138 | int node) | |
139 | { | |
140 | kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr, | |
141 | bytes_req, bytes_alloc, gfp_flags, node); | |
142 | } | |
143 | ||
38516ab5 SR |
144 | static void |
145 | kmemtrace_kfree(void *ignore, unsigned long call_site, const void *ptr) | |
ca2b84cb EGM |
146 | { |
147 | kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr); | |
148 | } | |
149 | ||
38516ab5 SR |
150 | static void kmemtrace_kmem_cache_free(void *ignore, |
151 | unsigned long call_site, const void *ptr) | |
ca2b84cb EGM |
152 | { |
153 | kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr); | |
154 | } | |
155 | ||
156 | static int kmemtrace_start_probes(void) | |
157 | { | |
158 | int err; | |
159 | ||
38516ab5 | 160 | err = register_trace_kmalloc(kmemtrace_kmalloc, NULL); |
ca2b84cb EGM |
161 | if (err) |
162 | return err; | |
38516ab5 | 163 | err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL); |
ca2b84cb EGM |
164 | if (err) |
165 | return err; | |
38516ab5 | 166 | err = register_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL); |
ca2b84cb EGM |
167 | if (err) |
168 | return err; | |
38516ab5 | 169 | err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL); |
ca2b84cb EGM |
170 | if (err) |
171 | return err; | |
38516ab5 | 172 | err = register_trace_kfree(kmemtrace_kfree, NULL); |
ca2b84cb EGM |
173 | if (err) |
174 | return err; | |
38516ab5 | 175 | err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL); |
ca2b84cb EGM |
176 | |
177 | return err; | |
178 | } | |
179 | ||
180 | static void kmemtrace_stop_probes(void) | |
181 | { | |
38516ab5 SR |
182 | unregister_trace_kmalloc(kmemtrace_kmalloc, NULL); |
183 | unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc, NULL); | |
184 | unregister_trace_kmalloc_node(kmemtrace_kmalloc_node, NULL); | |
185 | unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node, NULL); | |
186 | unregister_trace_kfree(kmemtrace_kfree, NULL); | |
187 | unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free, NULL); | |
ca2b84cb EGM |
188 | } |
189 | ||
36994e58 FW |
190 | static int kmem_trace_init(struct trace_array *tr) |
191 | { | |
36994e58 FW |
192 | kmemtrace_array = tr; |
193 | ||
76f0d073 | 194 | tracing_reset_online_cpus(tr); |
36994e58 | 195 | |
ca2b84cb | 196 | kmemtrace_start_probes(); |
36994e58 FW |
197 | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static void kmem_trace_reset(struct trace_array *tr) | |
202 | { | |
ca2b84cb | 203 | kmemtrace_stop_probes(); |
36994e58 FW |
204 | } |
205 | ||
206 | static void kmemtrace_headers(struct seq_file *s) | |
207 | { | |
208 | /* Don't need headers for the original kmemtrace output */ | |
209 | if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)) | |
210 | return; | |
211 | ||
212 | seq_printf(s, "#\n"); | |
213 | seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS " | |
214 | " POINTER NODE CALLER\n"); | |
215 | seq_printf(s, "# FREE | | | | " | |
216 | " | | | |\n"); | |
217 | seq_printf(s, "# |\n\n"); | |
218 | } | |
219 | ||
220 | /* | |
42af9054 EGM |
221 | * The following functions give the original output from kmemtrace, |
222 | * plus the origin CPU, since reordering occurs in-kernel now. | |
36994e58 | 223 | */ |
42af9054 EGM |
224 | |
225 | #define KMEMTRACE_USER_ALLOC 0 | |
226 | #define KMEMTRACE_USER_FREE 1 | |
227 | ||
228 | struct kmemtrace_user_event { | |
c826e3cd IM |
229 | u8 event_id; |
230 | u8 type_id; | |
231 | u16 event_size; | |
232 | u32 cpu; | |
233 | u64 timestamp; | |
234 | unsigned long call_site; | |
235 | unsigned long ptr; | |
42af9054 EGM |
236 | }; |
237 | ||
238 | struct kmemtrace_user_event_alloc { | |
c826e3cd IM |
239 | size_t bytes_req; |
240 | size_t bytes_alloc; | |
241 | unsigned gfp_flags; | |
242 | int node; | |
42af9054 EGM |
243 | }; |
244 | ||
36994e58 | 245 | static enum print_line_t |
a9a57763 SR |
246 | kmemtrace_print_alloc(struct trace_iterator *iter, int flags, |
247 | struct trace_event *event) | |
ddc1637a LZ |
248 | { |
249 | struct trace_seq *s = &iter->seq; | |
250 | struct kmemtrace_alloc_entry *entry; | |
251 | int ret; | |
252 | ||
253 | trace_assign_type(entry, iter->ent); | |
254 | ||
255 | ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu " | |
256 | "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n", | |
257 | entry->type_id, (void *)entry->call_site, (unsigned long)entry->ptr, | |
258 | (unsigned long)entry->bytes_req, (unsigned long)entry->bytes_alloc, | |
259 | (unsigned long)entry->gfp_flags, entry->node); | |
260 | ||
261 | if (!ret) | |
262 | return TRACE_TYPE_PARTIAL_LINE; | |
263 | return TRACE_TYPE_HANDLED; | |
264 | } | |
265 | ||
266 | static enum print_line_t | |
a9a57763 SR |
267 | kmemtrace_print_free(struct trace_iterator *iter, int flags, |
268 | struct trace_event *event) | |
36994e58 FW |
269 | { |
270 | struct trace_seq *s = &iter->seq; | |
ddc1637a LZ |
271 | struct kmemtrace_free_entry *entry; |
272 | int ret; | |
273 | ||
274 | trace_assign_type(entry, iter->ent); | |
275 | ||
276 | ret = trace_seq_printf(s, "type_id %d call_site %pF ptr %lu\n", | |
277 | entry->type_id, (void *)entry->call_site, | |
278 | (unsigned long)entry->ptr); | |
279 | ||
280 | if (!ret) | |
281 | return TRACE_TYPE_PARTIAL_LINE; | |
282 | return TRACE_TYPE_HANDLED; | |
283 | } | |
284 | ||
285 | static enum print_line_t | |
a9a57763 SR |
286 | kmemtrace_print_alloc_user(struct trace_iterator *iter, int flags, |
287 | struct trace_event *event) | |
ddc1637a LZ |
288 | { |
289 | struct trace_seq *s = &iter->seq; | |
290 | struct kmemtrace_alloc_entry *entry; | |
42af9054 | 291 | struct kmemtrace_user_event *ev; |
ddc1637a LZ |
292 | struct kmemtrace_user_event_alloc *ev_alloc; |
293 | ||
294 | trace_assign_type(entry, iter->ent); | |
36994e58 | 295 | |
42af9054 EGM |
296 | ev = trace_seq_reserve(s, sizeof(*ev)); |
297 | if (!ev) | |
298 | return TRACE_TYPE_PARTIAL_LINE; | |
c826e3cd IM |
299 | |
300 | ev->event_id = KMEMTRACE_USER_ALLOC; | |
301 | ev->type_id = entry->type_id; | |
302 | ev->event_size = sizeof(*ev) + sizeof(*ev_alloc); | |
303 | ev->cpu = iter->cpu; | |
304 | ev->timestamp = iter->ts; | |
305 | ev->call_site = entry->call_site; | |
306 | ev->ptr = (unsigned long)entry->ptr; | |
42af9054 EGM |
307 | |
308 | ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc)); | |
309 | if (!ev_alloc) | |
36994e58 | 310 | return TRACE_TYPE_PARTIAL_LINE; |
c826e3cd IM |
311 | |
312 | ev_alloc->bytes_req = entry->bytes_req; | |
313 | ev_alloc->bytes_alloc = entry->bytes_alloc; | |
314 | ev_alloc->gfp_flags = entry->gfp_flags; | |
315 | ev_alloc->node = entry->node; | |
36994e58 FW |
316 | |
317 | return TRACE_TYPE_HANDLED; | |
318 | } | |
319 | ||
320 | static enum print_line_t | |
a9a57763 SR |
321 | kmemtrace_print_free_user(struct trace_iterator *iter, int flags, |
322 | struct trace_event *event) | |
36994e58 FW |
323 | { |
324 | struct trace_seq *s = &iter->seq; | |
ddc1637a | 325 | struct kmemtrace_free_entry *entry; |
42af9054 | 326 | struct kmemtrace_user_event *ev; |
36994e58 | 327 | |
ddc1637a LZ |
328 | trace_assign_type(entry, iter->ent); |
329 | ||
42af9054 EGM |
330 | ev = trace_seq_reserve(s, sizeof(*ev)); |
331 | if (!ev) | |
36994e58 | 332 | return TRACE_TYPE_PARTIAL_LINE; |
c826e3cd IM |
333 | |
334 | ev->event_id = KMEMTRACE_USER_FREE; | |
335 | ev->type_id = entry->type_id; | |
336 | ev->event_size = sizeof(*ev); | |
337 | ev->cpu = iter->cpu; | |
338 | ev->timestamp = iter->ts; | |
339 | ev->call_site = entry->call_site; | |
340 | ev->ptr = (unsigned long)entry->ptr; | |
36994e58 FW |
341 | |
342 | return TRACE_TYPE_HANDLED; | |
343 | } | |
344 | ||
36994e58 FW |
345 | /* The two other following provide a more minimalistic output */ |
346 | static enum print_line_t | |
ddc1637a | 347 | kmemtrace_print_alloc_compress(struct trace_iterator *iter) |
36994e58 | 348 | { |
ddc1637a | 349 | struct kmemtrace_alloc_entry *entry; |
36994e58 FW |
350 | struct trace_seq *s = &iter->seq; |
351 | int ret; | |
352 | ||
ddc1637a LZ |
353 | trace_assign_type(entry, iter->ent); |
354 | ||
36994e58 FW |
355 | /* Alloc entry */ |
356 | ret = trace_seq_printf(s, " + "); | |
357 | if (!ret) | |
358 | return TRACE_TYPE_PARTIAL_LINE; | |
359 | ||
360 | /* Type */ | |
361 | switch (entry->type_id) { | |
362 | case KMEMTRACE_TYPE_KMALLOC: | |
363 | ret = trace_seq_printf(s, "K "); | |
364 | break; | |
365 | case KMEMTRACE_TYPE_CACHE: | |
366 | ret = trace_seq_printf(s, "C "); | |
367 | break; | |
368 | case KMEMTRACE_TYPE_PAGES: | |
369 | ret = trace_seq_printf(s, "P "); | |
370 | break; | |
371 | default: | |
372 | ret = trace_seq_printf(s, "? "); | |
373 | } | |
374 | ||
375 | if (!ret) | |
376 | return TRACE_TYPE_PARTIAL_LINE; | |
377 | ||
378 | /* Requested */ | |
ecf441b5 | 379 | ret = trace_seq_printf(s, "%4zu ", entry->bytes_req); |
36994e58 FW |
380 | if (!ret) |
381 | return TRACE_TYPE_PARTIAL_LINE; | |
382 | ||
383 | /* Allocated */ | |
ecf441b5 | 384 | ret = trace_seq_printf(s, "%4zu ", entry->bytes_alloc); |
36994e58 FW |
385 | if (!ret) |
386 | return TRACE_TYPE_PARTIAL_LINE; | |
387 | ||
388 | /* Flags | |
389 | * TODO: would be better to see the name of the GFP flag names | |
390 | */ | |
391 | ret = trace_seq_printf(s, "%08x ", entry->gfp_flags); | |
392 | if (!ret) | |
393 | return TRACE_TYPE_PARTIAL_LINE; | |
394 | ||
395 | /* Pointer to allocated */ | |
396 | ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr); | |
397 | if (!ret) | |
398 | return TRACE_TYPE_PARTIAL_LINE; | |
399 | ||
6a167c65 FW |
400 | /* Node and call site*/ |
401 | ret = trace_seq_printf(s, "%4d %pf\n", entry->node, | |
402 | (void *)entry->call_site); | |
36994e58 FW |
403 | if (!ret) |
404 | return TRACE_TYPE_PARTIAL_LINE; | |
405 | ||
36994e58 FW |
406 | return TRACE_TYPE_HANDLED; |
407 | } | |
408 | ||
409 | static enum print_line_t | |
ddc1637a | 410 | kmemtrace_print_free_compress(struct trace_iterator *iter) |
36994e58 | 411 | { |
ddc1637a | 412 | struct kmemtrace_free_entry *entry; |
36994e58 FW |
413 | struct trace_seq *s = &iter->seq; |
414 | int ret; | |
415 | ||
ddc1637a LZ |
416 | trace_assign_type(entry, iter->ent); |
417 | ||
36994e58 FW |
418 | /* Free entry */ |
419 | ret = trace_seq_printf(s, " - "); | |
420 | if (!ret) | |
421 | return TRACE_TYPE_PARTIAL_LINE; | |
422 | ||
423 | /* Type */ | |
424 | switch (entry->type_id) { | |
425 | case KMEMTRACE_TYPE_KMALLOC: | |
426 | ret = trace_seq_printf(s, "K "); | |
427 | break; | |
428 | case KMEMTRACE_TYPE_CACHE: | |
429 | ret = trace_seq_printf(s, "C "); | |
430 | break; | |
431 | case KMEMTRACE_TYPE_PAGES: | |
432 | ret = trace_seq_printf(s, "P "); | |
433 | break; | |
434 | default: | |
435 | ret = trace_seq_printf(s, "? "); | |
436 | } | |
437 | ||
438 | if (!ret) | |
439 | return TRACE_TYPE_PARTIAL_LINE; | |
440 | ||
441 | /* Skip requested/allocated/flags */ | |
442 | ret = trace_seq_printf(s, " "); | |
443 | if (!ret) | |
444 | return TRACE_TYPE_PARTIAL_LINE; | |
445 | ||
446 | /* Pointer to allocated */ | |
447 | ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr); | |
448 | if (!ret) | |
449 | return TRACE_TYPE_PARTIAL_LINE; | |
450 | ||
6a167c65 FW |
451 | /* Skip node and print call site*/ |
452 | ret = trace_seq_printf(s, " %pf\n", (void *)entry->call_site); | |
36994e58 FW |
453 | if (!ret) |
454 | return TRACE_TYPE_PARTIAL_LINE; | |
455 | ||
36994e58 FW |
456 | return TRACE_TYPE_HANDLED; |
457 | } | |
458 | ||
459 | static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter) | |
460 | { | |
461 | struct trace_entry *entry = iter->ent; | |
462 | ||
ddc1637a LZ |
463 | if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)) |
464 | return TRACE_TYPE_UNHANDLED; | |
36994e58 | 465 | |
ddc1637a LZ |
466 | switch (entry->type) { |
467 | case TRACE_KMEM_ALLOC: | |
468 | return kmemtrace_print_alloc_compress(iter); | |
469 | case TRACE_KMEM_FREE: | |
470 | return kmemtrace_print_free_compress(iter); | |
36994e58 FW |
471 | default: |
472 | return TRACE_TYPE_UNHANDLED; | |
473 | } | |
474 | } | |
475 | ||
a9a57763 | 476 | static struct trace_event_functions kmem_trace_alloc_funcs = { |
80098c20 LZ |
477 | .trace = kmemtrace_print_alloc, |
478 | .binary = kmemtrace_print_alloc_user, | |
ddc1637a LZ |
479 | }; |
480 | ||
a9a57763 SR |
481 | static struct trace_event kmem_trace_alloc = { |
482 | .type = TRACE_KMEM_ALLOC, | |
483 | .funcs = &kmem_trace_alloc_funcs, | |
484 | }; | |
485 | ||
486 | static struct trace_event_functions kmem_trace_free_funcs = { | |
80098c20 LZ |
487 | .trace = kmemtrace_print_free, |
488 | .binary = kmemtrace_print_free_user, | |
ddc1637a LZ |
489 | }; |
490 | ||
a9a57763 SR |
491 | static struct trace_event kmem_trace_free = { |
492 | .type = TRACE_KMEM_FREE, | |
493 | .funcs = &kmem_trace_free_funcs, | |
494 | }; | |
495 | ||
36994e58 | 496 | static struct tracer kmem_tracer __read_mostly = { |
c826e3cd IM |
497 | .name = "kmemtrace", |
498 | .init = kmem_trace_init, | |
499 | .reset = kmem_trace_reset, | |
500 | .print_line = kmemtrace_print_line, | |
501 | .print_header = kmemtrace_headers, | |
502 | .flags = &kmem_tracer_flags | |
36994e58 FW |
503 | }; |
504 | ||
3e806802 IM |
505 | void kmemtrace_init(void) |
506 | { | |
507 | /* earliest opportunity to start kmem tracing */ | |
508 | } | |
509 | ||
36994e58 FW |
510 | static int __init init_kmem_tracer(void) |
511 | { | |
ddc1637a LZ |
512 | if (!register_ftrace_event(&kmem_trace_alloc)) { |
513 | pr_warning("Warning: could not register kmem events\n"); | |
514 | return 1; | |
515 | } | |
516 | ||
517 | if (!register_ftrace_event(&kmem_trace_free)) { | |
518 | pr_warning("Warning: could not register kmem events\n"); | |
519 | return 1; | |
520 | } | |
521 | ||
f9ac5a69 | 522 | if (register_tracer(&kmem_tracer) != 0) { |
ddc1637a LZ |
523 | pr_warning("Warning: could not register the kmem tracer\n"); |
524 | return 1; | |
525 | } | |
526 | ||
527 | return 0; | |
36994e58 | 528 | } |
36994e58 | 529 | device_initcall(init_kmem_tracer); |