diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-02-17 19:09:07 -0500 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-02-17 19:09:07 -0500 |
commit | ac07bcaa8259841905ead3f8cd60b1923ca6c0e5 (patch) | |
tree | 162def1cd53ef477adca17fe06c33a484f6b2e87 /kernel/trace/ftrace.c | |
parent | 37bd824a35a60abc73e5fa8816bd5f50c913d69b (diff) | |
parent | 35ebf1caa4854ad5ba25f3a72967acc064147994 (diff) |
Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace
Diffstat (limited to 'kernel/trace/ftrace.c')
-rw-r--r-- | kernel/trace/ftrace.c | 102 |
1 files changed, 52 insertions, 50 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index aee95aea57e4..7dd5a2bef9cd 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c | |||
@@ -255,9 +255,9 @@ static struct pid * const ftrace_swapper_pid = &init_struct_pid; | |||
255 | 255 | ||
256 | static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly; | 256 | static struct hlist_head ftrace_func_hash[FTRACE_FUNC_HASHSIZE] __read_mostly; |
257 | 257 | ||
258 | struct ftrace_func_hook { | 258 | struct ftrace_func_probe { |
259 | struct hlist_node node; | 259 | struct hlist_node node; |
260 | struct ftrace_hook_ops *ops; | 260 | struct ftrace_probe_ops *ops; |
261 | unsigned long flags; | 261 | unsigned long flags; |
262 | unsigned long ip; | 262 | unsigned long ip; |
263 | void *data; | 263 | void *data; |
@@ -460,8 +460,8 @@ static void ftrace_bug(int failed, unsigned long ip) | |||
460 | static int | 460 | static int |
461 | __ftrace_replace_code(struct dyn_ftrace *rec, int enable) | 461 | __ftrace_replace_code(struct dyn_ftrace *rec, int enable) |
462 | { | 462 | { |
463 | unsigned long ip, fl; | ||
464 | unsigned long ftrace_addr; | 463 | unsigned long ftrace_addr; |
464 | unsigned long ip, fl; | ||
465 | 465 | ||
466 | ftrace_addr = (unsigned long)FTRACE_ADDR; | 466 | ftrace_addr = (unsigned long)FTRACE_ADDR; |
467 | 467 | ||
@@ -530,9 +530,9 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable) | |||
530 | 530 | ||
531 | static void ftrace_replace_code(int enable) | 531 | static void ftrace_replace_code(int enable) |
532 | { | 532 | { |
533 | int failed; | ||
534 | struct dyn_ftrace *rec; | 533 | struct dyn_ftrace *rec; |
535 | struct ftrace_page *pg; | 534 | struct ftrace_page *pg; |
535 | int failed; | ||
536 | 536 | ||
537 | do_for_each_ftrace_rec(pg, rec) { | 537 | do_for_each_ftrace_rec(pg, rec) { |
538 | /* | 538 | /* |
@@ -830,11 +830,11 @@ static void *t_hash_start(struct seq_file *m, loff_t *pos) | |||
830 | 830 | ||
831 | static int t_hash_show(struct seq_file *m, void *v) | 831 | static int t_hash_show(struct seq_file *m, void *v) |
832 | { | 832 | { |
833 | struct ftrace_func_hook *rec; | 833 | struct ftrace_func_probe *rec; |
834 | struct hlist_node *hnd = v; | 834 | struct hlist_node *hnd = v; |
835 | char str[KSYM_SYMBOL_LEN]; | 835 | char str[KSYM_SYMBOL_LEN]; |
836 | 836 | ||
837 | rec = hlist_entry(hnd, struct ftrace_func_hook, node); | 837 | rec = hlist_entry(hnd, struct ftrace_func_probe, node); |
838 | 838 | ||
839 | if (rec->ops->print) | 839 | if (rec->ops->print) |
840 | return rec->ops->print(m, rec->ip, rec->ops, rec->data); | 840 | return rec->ops->print(m, rec->ip, rec->ops, rec->data); |
@@ -1208,14 +1208,15 @@ ftrace_match_record(struct dyn_ftrace *rec, char *regex, int len, int type) | |||
1208 | 1208 | ||
1209 | static void ftrace_match_records(char *buff, int len, int enable) | 1209 | static void ftrace_match_records(char *buff, int len, int enable) |
1210 | { | 1210 | { |
1211 | char *search; | 1211 | unsigned int search_len; |
1212 | struct ftrace_page *pg; | 1212 | struct ftrace_page *pg; |
1213 | struct dyn_ftrace *rec; | 1213 | struct dyn_ftrace *rec; |
1214 | unsigned long flag; | ||
1215 | char *search; | ||
1214 | int type; | 1216 | int type; |
1215 | unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; | ||
1216 | unsigned search_len; | ||
1217 | int not; | 1217 | int not; |
1218 | 1218 | ||
1219 | flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; | ||
1219 | type = ftrace_setup_glob(buff, len, &search, ¬); | 1220 | type = ftrace_setup_glob(buff, len, &search, ¬); |
1220 | 1221 | ||
1221 | search_len = strlen(search); | 1222 | search_len = strlen(search); |
@@ -1263,14 +1264,16 @@ ftrace_match_module_record(struct dyn_ftrace *rec, char *mod, | |||
1263 | 1264 | ||
1264 | static void ftrace_match_module_records(char *buff, char *mod, int enable) | 1265 | static void ftrace_match_module_records(char *buff, char *mod, int enable) |
1265 | { | 1266 | { |
1266 | char *search = buff; | 1267 | unsigned search_len = 0; |
1267 | struct ftrace_page *pg; | 1268 | struct ftrace_page *pg; |
1268 | struct dyn_ftrace *rec; | 1269 | struct dyn_ftrace *rec; |
1269 | int type = MATCH_FULL; | 1270 | int type = MATCH_FULL; |
1270 | unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; | 1271 | char *search = buff; |
1271 | unsigned search_len = 0; | 1272 | unsigned long flag; |
1272 | int not = 0; | 1273 | int not = 0; |
1273 | 1274 | ||
1275 | flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE; | ||
1276 | |||
1274 | /* blank or '*' mean the same */ | 1277 | /* blank or '*' mean the same */ |
1275 | if (strcmp(buff, "*") == 0) | 1278 | if (strcmp(buff, "*") == 0) |
1276 | buff[0] = 0; | 1279 | buff[0] = 0; |
@@ -1348,9 +1351,9 @@ static int __init ftrace_mod_cmd_init(void) | |||
1348 | device_initcall(ftrace_mod_cmd_init); | 1351 | device_initcall(ftrace_mod_cmd_init); |
1349 | 1352 | ||
1350 | static void | 1353 | static void |
1351 | function_trace_hook_call(unsigned long ip, unsigned long parent_ip) | 1354 | function_trace_probe_call(unsigned long ip, unsigned long parent_ip) |
1352 | { | 1355 | { |
1353 | struct ftrace_func_hook *entry; | 1356 | struct ftrace_func_probe *entry; |
1354 | struct hlist_head *hhd; | 1357 | struct hlist_head *hhd; |
1355 | struct hlist_node *n; | 1358 | struct hlist_node *n; |
1356 | unsigned long key; | 1359 | unsigned long key; |
@@ -1376,18 +1379,18 @@ function_trace_hook_call(unsigned long ip, unsigned long parent_ip) | |||
1376 | ftrace_preempt_enable(resched); | 1379 | ftrace_preempt_enable(resched); |
1377 | } | 1380 | } |
1378 | 1381 | ||
1379 | static struct ftrace_ops trace_hook_ops __read_mostly = | 1382 | static struct ftrace_ops trace_probe_ops __read_mostly = |
1380 | { | 1383 | { |
1381 | .func = function_trace_hook_call, | 1384 | .func = function_trace_probe_call, |
1382 | }; | 1385 | }; |
1383 | 1386 | ||
1384 | static int ftrace_hook_registered; | 1387 | static int ftrace_probe_registered; |
1385 | 1388 | ||
1386 | static void __enable_ftrace_function_hook(void) | 1389 | static void __enable_ftrace_function_probe(void) |
1387 | { | 1390 | { |
1388 | int i; | 1391 | int i; |
1389 | 1392 | ||
1390 | if (ftrace_hook_registered) | 1393 | if (ftrace_probe_registered) |
1391 | return; | 1394 | return; |
1392 | 1395 | ||
1393 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { | 1396 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
@@ -1399,16 +1402,16 @@ static void __enable_ftrace_function_hook(void) | |||
1399 | if (i == FTRACE_FUNC_HASHSIZE) | 1402 | if (i == FTRACE_FUNC_HASHSIZE) |
1400 | return; | 1403 | return; |
1401 | 1404 | ||
1402 | __register_ftrace_function(&trace_hook_ops); | 1405 | __register_ftrace_function(&trace_probe_ops); |
1403 | ftrace_startup(0); | 1406 | ftrace_startup(0); |
1404 | ftrace_hook_registered = 1; | 1407 | ftrace_probe_registered = 1; |
1405 | } | 1408 | } |
1406 | 1409 | ||
1407 | static void __disable_ftrace_function_hook(void) | 1410 | static void __disable_ftrace_function_probe(void) |
1408 | { | 1411 | { |
1409 | int i; | 1412 | int i; |
1410 | 1413 | ||
1411 | if (!ftrace_hook_registered) | 1414 | if (!ftrace_probe_registered) |
1412 | return; | 1415 | return; |
1413 | 1416 | ||
1414 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { | 1417 | for (i = 0; i < FTRACE_FUNC_HASHSIZE; i++) { |
@@ -1418,16 +1421,16 @@ static void __disable_ftrace_function_hook(void) | |||
1418 | } | 1421 | } |
1419 | 1422 | ||
1420 | /* no more funcs left */ | 1423 | /* no more funcs left */ |
1421 | __unregister_ftrace_function(&trace_hook_ops); | 1424 | __unregister_ftrace_function(&trace_probe_ops); |
1422 | ftrace_shutdown(0); | 1425 | ftrace_shutdown(0); |
1423 | ftrace_hook_registered = 0; | 1426 | ftrace_probe_registered = 0; |
1424 | } | 1427 | } |
1425 | 1428 | ||
1426 | 1429 | ||
1427 | static void ftrace_free_entry_rcu(struct rcu_head *rhp) | 1430 | static void ftrace_free_entry_rcu(struct rcu_head *rhp) |
1428 | { | 1431 | { |
1429 | struct ftrace_func_hook *entry = | 1432 | struct ftrace_func_probe *entry = |
1430 | container_of(rhp, struct ftrace_func_hook, rcu); | 1433 | container_of(rhp, struct ftrace_func_probe, rcu); |
1431 | 1434 | ||
1432 | if (entry->ops->free) | 1435 | if (entry->ops->free) |
1433 | entry->ops->free(&entry->data); | 1436 | entry->ops->free(&entry->data); |
@@ -1436,21 +1439,21 @@ static void ftrace_free_entry_rcu(struct rcu_head *rhp) | |||
1436 | 1439 | ||
1437 | 1440 | ||
1438 | int | 1441 | int |
1439 | register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | 1442 | register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
1440 | void *data) | 1443 | void *data) |
1441 | { | 1444 | { |
1442 | struct ftrace_func_hook *entry; | 1445 | struct ftrace_func_probe *entry; |
1443 | struct ftrace_page *pg; | 1446 | struct ftrace_page *pg; |
1444 | struct dyn_ftrace *rec; | 1447 | struct dyn_ftrace *rec; |
1445 | unsigned long key; | ||
1446 | int type, len, not; | 1448 | int type, len, not; |
1449 | unsigned long key; | ||
1447 | int count = 0; | 1450 | int count = 0; |
1448 | char *search; | 1451 | char *search; |
1449 | 1452 | ||
1450 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); | 1453 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); |
1451 | len = strlen(search); | 1454 | len = strlen(search); |
1452 | 1455 | ||
1453 | /* we do not support '!' for function hooks */ | 1456 | /* we do not support '!' for function probes */ |
1454 | if (WARN_ON(not)) | 1457 | if (WARN_ON(not)) |
1455 | return -EINVAL; | 1458 | return -EINVAL; |
1456 | 1459 | ||
@@ -1465,7 +1468,7 @@ register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | |||
1465 | 1468 | ||
1466 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); | 1469 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
1467 | if (!entry) { | 1470 | if (!entry) { |
1468 | /* If we did not hook to any, then return error */ | 1471 | /* If we did not process any, then return error */ |
1469 | if (!count) | 1472 | if (!count) |
1470 | count = -ENOMEM; | 1473 | count = -ENOMEM; |
1471 | goto out_unlock; | 1474 | goto out_unlock; |
@@ -1495,7 +1498,7 @@ register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | |||
1495 | hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]); | 1498 | hlist_add_head_rcu(&entry->node, &ftrace_func_hash[key]); |
1496 | 1499 | ||
1497 | } while_for_each_ftrace_rec(); | 1500 | } while_for_each_ftrace_rec(); |
1498 | __enable_ftrace_function_hook(); | 1501 | __enable_ftrace_function_probe(); |
1499 | 1502 | ||
1500 | out_unlock: | 1503 | out_unlock: |
1501 | mutex_unlock(&ftrace_lock); | 1504 | mutex_unlock(&ftrace_lock); |
@@ -1504,15 +1507,15 @@ register_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | |||
1504 | } | 1507 | } |
1505 | 1508 | ||
1506 | enum { | 1509 | enum { |
1507 | HOOK_TEST_FUNC = 1, | 1510 | PROBE_TEST_FUNC = 1, |
1508 | HOOK_TEST_DATA = 2 | 1511 | PROBE_TEST_DATA = 2 |
1509 | }; | 1512 | }; |
1510 | 1513 | ||
1511 | static void | 1514 | static void |
1512 | __unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | 1515 | __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
1513 | void *data, int flags) | 1516 | void *data, int flags) |
1514 | { | 1517 | { |
1515 | struct ftrace_func_hook *entry; | 1518 | struct ftrace_func_probe *entry; |
1516 | struct hlist_node *n, *tmp; | 1519 | struct hlist_node *n, *tmp; |
1517 | char str[KSYM_SYMBOL_LEN]; | 1520 | char str[KSYM_SYMBOL_LEN]; |
1518 | int type = MATCH_FULL; | 1521 | int type = MATCH_FULL; |
@@ -1527,7 +1530,7 @@ __unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | |||
1527 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); | 1530 | type = ftrace_setup_glob(glob, strlen(glob), &search, ¬); |
1528 | len = strlen(search); | 1531 | len = strlen(search); |
1529 | 1532 | ||
1530 | /* we do not support '!' for function hooks */ | 1533 | /* we do not support '!' for function probes */ |
1531 | if (WARN_ON(not)) | 1534 | if (WARN_ON(not)) |
1532 | return; | 1535 | return; |
1533 | } | 1536 | } |
@@ -1539,10 +1542,10 @@ __unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | |||
1539 | hlist_for_each_entry_safe(entry, n, tmp, hhd, node) { | 1542 | hlist_for_each_entry_safe(entry, n, tmp, hhd, node) { |
1540 | 1543 | ||
1541 | /* break up if statements for readability */ | 1544 | /* break up if statements for readability */ |
1542 | if ((flags & HOOK_TEST_FUNC) && entry->ops != ops) | 1545 | if ((flags & PROBE_TEST_FUNC) && entry->ops != ops) |
1543 | continue; | 1546 | continue; |
1544 | 1547 | ||
1545 | if ((flags & HOOK_TEST_DATA) && entry->data != data) | 1548 | if ((flags & PROBE_TEST_DATA) && entry->data != data) |
1546 | continue; | 1549 | continue; |
1547 | 1550 | ||
1548 | /* do this last, since it is the most expensive */ | 1551 | /* do this last, since it is the most expensive */ |
@@ -1557,27 +1560,27 @@ __unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | |||
1557 | call_rcu(&entry->rcu, ftrace_free_entry_rcu); | 1560 | call_rcu(&entry->rcu, ftrace_free_entry_rcu); |
1558 | } | 1561 | } |
1559 | } | 1562 | } |
1560 | __disable_ftrace_function_hook(); | 1563 | __disable_ftrace_function_probe(); |
1561 | mutex_unlock(&ftrace_lock); | 1564 | mutex_unlock(&ftrace_lock); |
1562 | } | 1565 | } |
1563 | 1566 | ||
1564 | void | 1567 | void |
1565 | unregister_ftrace_function_hook(char *glob, struct ftrace_hook_ops *ops, | 1568 | unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, |
1566 | void *data) | 1569 | void *data) |
1567 | { | 1570 | { |
1568 | __unregister_ftrace_function_hook(glob, ops, data, | 1571 | __unregister_ftrace_function_probe(glob, ops, data, |
1569 | HOOK_TEST_FUNC | HOOK_TEST_DATA); | 1572 | PROBE_TEST_FUNC | PROBE_TEST_DATA); |
1570 | } | 1573 | } |
1571 | 1574 | ||
1572 | void | 1575 | void |
1573 | unregister_ftrace_function_hook_func(char *glob, struct ftrace_hook_ops *ops) | 1576 | unregister_ftrace_function_probe_func(char *glob, struct ftrace_probe_ops *ops) |
1574 | { | 1577 | { |
1575 | __unregister_ftrace_function_hook(glob, ops, NULL, HOOK_TEST_FUNC); | 1578 | __unregister_ftrace_function_probe(glob, ops, NULL, PROBE_TEST_FUNC); |
1576 | } | 1579 | } |
1577 | 1580 | ||
1578 | void unregister_ftrace_function_hook_all(char *glob) | 1581 | void unregister_ftrace_function_probe_all(char *glob) |
1579 | { | 1582 | { |
1580 | __unregister_ftrace_function_hook(glob, NULL, NULL, 0); | 1583 | __unregister_ftrace_function_probe(glob, NULL, NULL, 0); |
1581 | } | 1584 | } |
1582 | 1585 | ||
1583 | static LIST_HEAD(ftrace_commands); | 1586 | static LIST_HEAD(ftrace_commands); |
@@ -1623,8 +1626,8 @@ int unregister_ftrace_command(struct ftrace_func_command *cmd) | |||
1623 | 1626 | ||
1624 | static int ftrace_process_regex(char *buff, int len, int enable) | 1627 | static int ftrace_process_regex(char *buff, int len, int enable) |
1625 | { | 1628 | { |
1626 | struct ftrace_func_command *p; | ||
1627 | char *func, *command, *next = buff; | 1629 | char *func, *command, *next = buff; |
1630 | struct ftrace_func_command *p; | ||
1628 | int ret = -EINVAL; | 1631 | int ret = -EINVAL; |
1629 | 1632 | ||
1630 | func = strsep(&next, ":"); | 1633 | func = strsep(&next, ":"); |
@@ -2392,7 +2395,6 @@ static __init int ftrace_init_debugfs(void) | |||
2392 | "'set_ftrace_pid' entry\n"); | 2395 | "'set_ftrace_pid' entry\n"); |
2393 | return 0; | 2396 | return 0; |
2394 | } | 2397 | } |
2395 | |||
2396 | fs_initcall(ftrace_init_debugfs); | 2398 | fs_initcall(ftrace_init_debugfs); |
2397 | 2399 | ||
2398 | /** | 2400 | /** |