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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
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