// 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;
%}
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