hurd: Also make it possible to call strlen very early
[glibc.git] / nptl / DESIGN-systemtap-probes.txt
blob6a62e25532765f5f6a6e8c8dcc618301a8f82d07
1 Systemtap is a dynamic tracing/instrumenting tool available on Linux. Probes
2 that are not fired at run time have close to zero overhead.
4 The following probes are available for NPTL:
6 Thread creation & Join Probes
7 =============================
8 pthread_create - probe for pthread_create
9                arg1 = pointer (pthread_t*) to thread
10                arg2 = pointer (pthread_attr_t*) to attr
11                arg3 = pointer (void *) to start_routine
12                arg4 = arguments to start_routine
13 pthread_start - probe for actual thread creation
14               arg1 = struct pthread (members include thread ID, process ID)
15               arg2 = address of start_routine
16               arg3 = pointer to the list of arguments
17 pthread_join - probe for pthread_join
18              arg1 = thread ID
19 pthread_join_ret - probe for pthread_join return
20                  arg1 = thread ID
21                  arg2 = return value
23 Lock-related Probes
24 ===================
25 mutex_init    - probe for pthread_mutex_init
26               arg1 = address of mutex lock
27 mutex_acquired - probe for succ. return of pthread_mutex_lock
28                arg1 = address of mutex lock
29 mutex_timedlock_acquired - probe for succ. return of pthread_mutex_timedlock
30                          arg1 = address of mutex lock
31 mutex_entry   - probe for entry to the pthread_mutex_lock function
32               arg1 = address of mutex lock
33 mutex_timedlock_entry - probe for entry to the pthread_mutex_timedlock function
34                       arg1 = address of mutex lock, arg2 = address of timespec
35 mutex_clocklock_entry - probe for entry to the pthread_mutex_clocklock function
36                       arg1 = address of mutex lock, arg2 = clockid,
37                       arg3 = address of timespec
38 mutex_release - probe for pthread_mutex_unlock after the successful release of a
39                 mutex lock
40               arg1 = address of mutex lock
41 mutex_destroy - probe for pthread_mutex_destroy
42               arg1 = address of mutex lock
44 wrlock_entry - probe for entry to the pthread_rwlock_wrlock function
45              arg1 = address of rw lock
46 rdlock_entry - probe for entry to the pthread_rwlock_rdlock function
47              arg1 = address of rw lock
49 rwlock_destroy - probe for pthread_rwlock_destroy
50                arg1 = address of rw lock
51 wrlock_acquire_write - probe for pthread_rwlock_wrlock (after getting the lock)
52                      arg1 = address of rw lock
53 rdlock_acquire_read - probe for pthread_rwlock_rdlock after successfully getting
54                       the lock
55                     arg1 = address of rw lock
56 rwlock_unlock - probe for pthread_rwlock_unlock
57               arg1 = address of rw lock
59 Condition variable Probes
60 =========================
61 cond_init - probe for pthread_cond_init
62           arg1 = condition
63           arg2 = attr
64 cond_destroy - probe for pthread_cond_destroy
65              arg1 = cond
66 cond_wait - probe for pthread_cond_wait
67           arg1 = condition
68           arg2 = mutex lock
69 cond_timedwait - probe for pthread_cond_timedwait
70                arg1 = condition
71                arg2 = mutex lock
72                arg3 = timespec
73 cond_signal - probe for pthread_cond_signal
74             arg1 = condition
75 cond_broadcast - probe for pthread_cond_broadcast
76                arg1 = condition