Edit File: timestamp.stp
// timestamp tapset // Copyright (C) 2005-2006 Red Hat Inc. // Copyright (C) 2006 Intel Corporation. // // This file is part of systemtap, and is free software. You can // redistribute it and/or modify it under the terms of the GNU General // Public License (GPL); either version 2, or (at your option) any // later version. // <tapsetdescription> // Each timestamp function returns a value to indicate when a function is executed. These //returned values can then be used to indicate when an event occurred, provide an ordering for events, //or compute the amount of time elapsed between two time stamps. // </tapsetdescription> /** * sfunction get_cycles - Processor cycle count * * Description: This function returns the processor cycle counter value * if available, else it returns zero. The cycle counter is free running * and unsynchronized on each processor. Thus, the order of events cannot * determined by comparing the results of the get_cycles function on * different processors. */ function get_cycles:long () %{ /* pure */ /* unprivileged */ cycles_t c = get_cycles(); STAP_RETVALUE = (int64_t) c; %} /** * sfunction jiffies - Kernel jiffies count * * Description: This function returns the value of the kernel jiffies * variable. This value is incremented periodically by timer interrupts, * and may wrap around a 32-bit or 64-bit boundary. See HZ(). */ function jiffies:long () %{ /* pure */ /* unprivileged */ STAP_RETVALUE = (int64_t) jiffies; %} /** * sfunction HZ - Kernel HZ * * Description: This function returns the value of the kernel HZ macro, * which corresponds to the rate of increase of the jiffies value. */ function HZ:long () %{ /* pure */ /* unprivileged */ STAP_RETVALUE = (int64_t) HZ; %}