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Diffstat (limited to 'libc/nptl/DESIGN-systemtap-probes.txt')
| -rw-r--r-- | libc/nptl/DESIGN-systemtap-probes.txt | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/libc/nptl/DESIGN-systemtap-probes.txt b/libc/nptl/DESIGN-systemtap-probes.txt new file mode 100644 index 000000000..16d7c4513 --- /dev/null +++ b/libc/nptl/DESIGN-systemtap-probes.txt @@ -0,0 +1,89 @@ +Systemtap is a dynamic tracing/instrumenting tool available on Linux. Probes +that are not fired at run time have close to zero overhead. + +The following probes are available for NPTL: + +Thread creation & Join Probes +============================= +pthread_create - probe for pthread_create + arg1 = pointer (pthread_t*) to thread + arg2 = pointer (pthread_attr_t*) to attr + arg3 = pointer (void *) to start_routine + arg4 = arguments to start_routine +pthread_start - probe for actual thread creation + arg1 = struct pthread (members include thread ID, process ID) + arg2 = address of start_routine + arg3 = pointer to the list of arguments +pthread_join - probe for pthread_join + arg1 = thread ID +pthread_join_ret - probe for pthread_join return + arg1 = thread ID + arg2 = return value + +Lock-related Probes +=================== +mutex_init - probe for pthread_mutex_init + arg1 = address of mutex lock +mutex_acquired - probe for succ. return of pthread_mutex_lock + arg1 = address of mutex lock +mutex_timedlock_acquired - probe for succ. return of pthread_mutex_timedlock + arg1 = address of mutex lock +mutex_entry - probe for entry to the pthread_mutex_lock function + arg1 = address of mutex lock +mutex_timedlock_entry - probe for entry to the pthread_mutex_timedlock function + arg1 = address of mutex lock, arg2 = address of timespec +mutex_release - probe for pthread_mutex_unlock after the successful release of a + mutex lock + arg1 = address of mutex lock +mutex_destroy - probe for pthread_mutex_destroy + arg1 = address of mutex lock + +wrlock_entry - probe for entry to the pthread_rwlock_wrlock function + arg1 = address of rw lock +rdlock_entry - probe for entry to the pthread_rwlock_rdlock function + arg1 = address of rw lock + +rwlock_destroy - probe for pthread_rwlock_destroy + arg1 = address of rw lock +wrlock_acquire_write - probe for pthread_rwlock_wrlock (after getting the lock) + arg1 = address of rw lock +rdlock_acquire_read - probe for pthread_rwlock_rdlock after successfully getting + the lock + arg1 = address of rw lock +rwlock_unlock - probe for pthread_rwlock_unlock + arg1 = address of rw lock + +lll_lock_wait - probe in low-level (assembly language) locking code, only fired + when futex/FUTEX_WAIT is called (i.e. when trying to acquire a + contented lock) + arg1 = pointer to futex + arg2 = flags passed to the futex system call +lll_lock_wait_private - probe in low-level (assembly language) locking code, + only fired when futex/FUTEX_WAIT is called (i.e. when + trying to acquire a contented lock) + arg1 = pointer to futex + +lll_futex_wake - probe in low-level (assembly language) locking code, only fired + when futex (FUTEX_WAKE) is called + arg1 = pointer to futex + arg2 = number of processes to wake + arg3 = additional flags + +Condition variable Probes +========================= +cond_init - probe for pthread_cond_init + arg1 = condition + arg2 = attr +cond_destroy - probe for pthread_cond_destroy + arg1 = cond +cond_wait - probe for pthread_cond_wait + arg1 = condition + arg2 = mutex lock +cond_timedwait - probe for pthread_cond_timedwait + arg1 = condition + arg2 = mutex lock + arg3 = timespec +cond_signal - probe for pthread_cond_signal + arg1 = condition +cond_broadcast - probe for pthread_cond_broadcast + arg1 = condition |