tsastat_with_lock.bt

// The futex states as defined in uapi/linux/futex.h
#define FUTEX_WAIT		0
#define FUTEX_WAIT_BITSET	9
#define FUTEX_PRIVATE_FLAG	128
#define FUTEX_WAIT_PRIVATE	(FUTEX_WAIT | FUTEX_PRIVATE_FLAG)
#define FUTEX_WAIT_BITSET_PRIVATE	(FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG)

// Track futex wait operations (lock attempts)
tracepoint:syscalls:sys_enter_futex
/args->op == FUTEX_WAIT || args->op == FUTEX_WAIT_BITSET || args->op == FUTEX_WAIT_PRIVATE || args->op == FUTEX_WAIT_BITSET_PRIVATE /
{
  @lock_ts[tid] = nsecs;
}

// Track futex wake operations (lock release)
tracepoint:syscalls:sys_exit_futex
/has_key(@lock_ts, tid)/
{
    @lck[comm, tid] = sum(nsecs - @lock_ts[tid]);
    delete(@lock_ts, tid);
}