/usr/share/systemtap/tapset/indent.stp is in systemtap-common 1.7-1+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | global _indent_counters, _indent_timestamps
function _generic_indent (idx, desc, delta)
{
ts = __indent_timestamp ()
if (! _indent_counters[idx]) _indent_timestamps[idx] = ts
# pre-increment for positive delta and post-decrement for negative delta
x = _indent_counters[idx] + (delta > 0 ? delta : 0)
_indent_counters[idx] += delta
return sprintf("%6d %s:%-*s", (ts - _indent_timestamps[idx]), desc, (x>0 ? x-1 : 0), "")
}
/**
* sfunction thread_indent - returns an amount of space with the current task information
*
* @delta: the amount of space added/removed for each call
*
* Description: This function returns a string with appropriate
* indentation for a thread. Call it with a small positive or
* matching negative delta. If this is the real outermost,
* initial level of indentation, then the function resets the
* relative timestamp base to zero. An example is shown at the
* end of this file.
*/
function thread_indent:string (delta:long)
{
return _generic_indent (tid(), sprintf("%s(%d)", execname(), tid()), delta)
}
/**
* sfunction indent - returns an amount of space to indent
*
* @delta: the amount of space added/removed for each call
*
* Description: This function returns a string with appropriate
* indentation. Call it with a small positive or matching negative
* delta. Unlike the thread_indent function, the indent does not
* track individual indent values on a per thread basis.
*/
function indent:string (delta:long){
return _generic_indent(-1, "", delta)
}
/* The following example uses thread_indent() to trace the functions
* called in the drivers/usb/core kernel source. It prints a relative
* timestamp and the name and ID of the current process, followed by
* the appropriate indent and the function name. Note that
* 'char' swapper(0) indicates the kernel is running in interrupt
* context and there is no valid current process.
*
* probe kernel.function("*@drivers/usb/core/*") {
* printf("%s -> %s\n, thread_indent(1), probefunc())
* }
* probe kernel.function("*@drivers/usb/core/*").return {
* printf("%s <- %s\n", thread_indent(-1), probefunc())
* }
*
* //This prints:
* 0 swapper(0): -> usb_hcd_irq
* 8 swapper(0): <- usb_hcd_irq
* 0 swapper(0): -> usb_hcd_irq
* 10 swapper(0): -> usb_hcd_giveback_urb
* 16 swapper(0): -> urb_unlink
* 22 swapper(0): <- usb_unlink
* 29 swapper(0): -> usb_free_urb
* 35 swapper(0): <- usb_hcd_urb
* 39 swapper(0): <- usb_hcd_giveback_urb
* 45 swapper(0): <- usb_hcd_irq
* 0 usb-storage(1338): -> usb_submit_urb
* 6 usb-storage(1338): -> usb_hcd_submit_urb
* 12 usb-storage(1338): -> usb_get_urb
* 18 usb-storage(1338): <- usb_get_urb
* 25 usb-storage(1338): <- usb_hcd_submit_urb
* 29 usb-storage(1338): -> usb_submit_urb
* 0 swapper(0): -> usb_hcd_irq
* 7 swapper(0): <- usb_hcd_irq
*/
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