[systemtap.git] / testsuite / systemtap.examples / keyword-index.txt

SYSTEMTAP EXAMPLES INDEX BY KEYWORD
(see also index.txt)

= ALLOCATOR =

memory/vm.tracepoints.stp - Collect slab allocation statistics
keywords: memory slab allocator

  The script will probe all memory slab/slub allocations and collects
  information about the size of the object (bytes requested) and
  user-space process in execution. When run over a period of time, it
  helps to correlate kernel-space memory consumption owing to
  user-space processes.


= AUTOFS =

network/autofs4.stp - Watch autofs4 operations
keywords: network autofs nfs

  Trace key autofs4 operations such as mounting or unmounting remote
  filesystems.


= BACKTRACE =

interrupt/scf.stp - Tally Backtraces for Inter-Processor Interrupt (IPI)
keywords: interrupt backtrace

  The Linux kernel function smp_call_function causes expensive
  inter-processor interrupts (IPIs). The scf.stp script tallies the
  processes and backtraces causing the interprocessor interrupts to
  identify the cause of the expensive IPI. On exit the script prints
  the tallies in descending frequency.


io/io_submit.stp - Tally Reschedule Reason During AIO io_submit Call
keywords: io backtrace

  When a reschedule occurs during an AIO io_submit call, accumulate the
  traceback in a histogram. When the script exits prints out a sorted
  list from most common to least common backtrace.


process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: io scheduler backtrace

  The script monitors the time that threads spend in waiting for IO
  operations (in "D" state) in the wait_for_completion function.  If a
  thread spends over 10ms, its name and backtrace is printed, and later
  so is the total delay.


= BUFFER =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


= CALLGRAPH =

general/para-callgraph.stp - Callgraph tracing with arguments
keywords: trace callgraph

  Print a timed per-thread callgraph, complete with function parameters
  and return values.  The first parameter names the function probe
  points to trace.  The optional second parameter names the probe
  points for trigger functions, which acts to enable tracing for only
  those functions that occur while the current thread is nested within
  the trigger.


= CPU =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


= DEVICE =

network/netdev.stp - Trace Activity on Network Devices
keywords: network device traffic

  The netdev.stp script traces configuration and transmit/receive
  activity on network devices.


= DISK =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


io/disktop.stp - Summarize Disk Read/Write Traffic
keywords: disk

  Get the status of reading/writing disk every 5 seconds, output top
  ten entries during that period.


= FILES =

process/pfiles.stp - print process file descriptors
keywords: process files

  Run pfiles.stp to produce a human-readable summary of all open file
  descriptors of a given process.  Specify the process-id as -x PID for
  fastest performance.


= FILESYSTEM =

general/badname.stp - Bad Filename Filter
keywords: filesystem hack

  The badname.stp script shows how one could prevent the creation of
  files with undesirable names using guru mode.


= FORMAT =

general/ansi_colors.stp - Color Table for ansi_set_color2() and ansi_set_color3()
keywords: format

  The script prints a table showing the available color combinations
  for the ansi_set_color2() and ans_set_color3() functions in the
  ansi.stp tapset.


general/ansi_colors2.stp - Show Attribues in Table for ansi_set_color3()
keywords: format

  The script prints a table showing the available attributes (bold,
  underline, and inverse) with color combinations for the
  ans_set_color3() function in the ansi.stp tapset.


= FREE =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


= FUNCTIONS =

profiling/functioncallcount.stp - Count Times Functions Called
keywords: profiling functions

  The functioncallcount.stp script takes one argument, a list of
  functions to probe. The script will run and count the number of times
  that each of the functions on the list is called. On exit the script
  will print a sorted list from most frequently to least frequently
  called function.


profiling/sched_switch.stp - Display the task switches happening in the scheduler
keywords: profiling functions

  The sched_switch.stp script takes two arguments, first argument can
  be "pid" or "name" to indicate what is being passed as second
  argument. The script will trace the process based on pid/name and
  print the scheduler switches happening with the process. If no
  arguments are passed, it displays all the scheduler switches. This
  can be used to understand which tasks schedule out the current
  process being traced, and when it gets scheduled in again.


= FUTEX =

process/futexes.stp - System-Wide Futex Contention
keywords: syscall locking futex

  The script watches the futex syscall on the system. On exit the
  futexes address, the number of contentions, and the average time for
  each contention on the futex are printed from lowest pid number to
  highest.


= GRAPH =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


= HACK =

general/badname.stp - Bad Filename Filter
keywords: filesystem hack

  The badname.stp script shows how one could prevent the creation of
  files with undesirable names using guru mode.


= INTERRUPT =

interrupt/interrupts-by-dev.stp - Record interrupts on a per-device basis.
keywords: interrupt

  The interrupts-by-dev.stp script profiles interrupts received by each
  device per 100 ms.


interrupt/scf.stp - Tally Backtraces for Inter-Processor Interrupt (IPI)
keywords: interrupt backtrace

  The Linux kernel function smp_call_function causes expensive
  inter-processor interrupts (IPIs). The scf.stp script tallies the
  processes and backtraces causing the interprocessor interrupts to
  identify the cause of the expensive IPI. On exit the script prints
  the tallies in descending frequency.


process/cycle_thief.stp - Track IRQs and Other Processes Stealing Cycles from a Task
keywords: process scheduler time tracepoint interrupt

  The cycle_thief.stp script instruments the scheduler and IRQ handler
  to determine which processes and interrupts are competing with the
  specified task for the cpu cycles. This script uses the '-c' or '-x'
  options to focus on a specific task. The script output the number of
  times the task migrates between processors, histograms showing the
  length of time on and off processor, lists of processes running while
  the task is off the processor, and the interrupts that occurred while
  the task was running.


= IO =

io/io_submit.stp - Tally Reschedule Reason During AIO io_submit Call
keywords: io backtrace

  When a reschedule occurs during an AIO io_submit call, accumulate the
  traceback in a histogram. When the script exits prints out a sorted
  list from most common to least common backtrace.


io/ioblktime.stp - Average Time Block IO Requests Spend in Queue 
keywords: io

  The ioblktime.stp script tracks the amount of time that each block IO
  requests spend waiting for completion. The script computes the
  average waiting time for block IO per device and prints list every 10
  seconds. In some cases there can be too many outstanding block IO
  operations and the script may exceed the default number of
  MAXMAPENTRIES allowed. In this case the allowed number can be
  increased with "-DMAXMAPENTRIES=10000" option on the stap command
  line.


io/iodevstats.stp - List Executables Reading and Writing the Most Data by Device
keywords: io profiling

   The iodevstats.stp script measures the amount of data successfully
  read and written by all the executables for each io device on the
  system.  The output is sorted from greatest sum of bytes read and
  written to a device by an executable to the least. The output
  contains device major/minor number, the count of operations (reads
  and writes), the totals and averages for the number of bytes read and
  written.


io/iostat-scsi.stp - iostat for SCSI Devices
keywords: io profiling scsi

  The iostat-scsi.stp script provides a breakdown of the number of blks
  read and written on the machine's various SCSI devices. The script
  takes one argument which is the number of seconds between reports.


io/iostats.stp - List Executables Reading and Writing the Most Data
keywords: io profiling

   The iostat.stp script measures the amount of data successfully read
  and written by all the executables on the system.  The output is
  sorted from most greatest sum of bytes read and written by an
  executable to the least. The output contains	the count of operations
  (opens, reads, and writes), the totals and averages for the number of
  bytes read and written.


io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spent in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parentheses. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


io/iotop.stp - Periodically Print I/O Activity by Process Name
keywords: io

  Every five seconds print out the top ten executables generating I/O
  traffic during that interval sorted in descending order.


io/mbrwatch.stp - Monitor read/write of MBR (boot sector) area of block devices
keywords: io monitoring

   The mbrwatch.stp script reports any attempted reads/writes of the
  first few sectors of a raw block device.


io/nfs_func_users.stp - Tally the Number of NFS Functions Used by Each Process
keywords: io profiling

  The nfs_func_users.stp script counts the uses of NFS functions in the
  kernel on a per process bases.  The output is sorted from the process
  with the greatest number of NFS functions called to the least. The
  output contains the executable name, the process number, and the
  total number of NFS functions called by the process.


io/traceio.stp - Track Cumulative I/O Activity by Process Name
keywords: io

  Every second print out the top ten executables sorted in descending
  order based on cumulative I/O traffic observed.


io/traceio2.stp - Watch I/O Activity on a Particular Device
keywords: io

  Print out the executable name and process number as reads and writes
  to the specified device occur.


io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitoring

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: io scheduler backtrace

  The script monitors the time that threads spend in waiting for IO
  operations (in "D" state) in the wait_for_completion function.  If a
  thread spends over 10ms, its name and backtrace is printed, and later
  so is the total delay.


= LOCKING =

locks/bkl.stp - Tracing Contention on Big Kernel Lock (BKL)
keywords: locking

  The bkl.stp script can help determine whether the Big Kernel Lock
  (BKL) is causing serialization on a multiprocessor system due to
  excessive contention of the BKL. The bkl.stp script takes one
  argument which is the number of processes waiting for the Big Kernel
  Lock (BKL). When the number of processes waiting for the BKL is
  reached or exceeded, the script will print a time stamp, the number
  of processes waiting for the BKL, the holder of the BKL, and the
  amount of time the BKL was held.


locks/bkl_stats.stp - Per Process Statistics on Big Kernel Lock (BKL) Use
keywords: locking

  The bkl_stats.stp script can indicate which processes have excessive
  waits for the Big Kernel Lock (BKL) and which processes are taking
  the BKL for long periods of time. The bkl_stats.stp script prints
  lists of all the processes that require the BKL. Every five seconds
  two tables are printed out. The first table lists the processes that
  waited for the BKL followed by the number of times that the process
  waited, the minimum time of the wait, the average and the maximum
  time waited. The second table lists has similar information for the
  time spent in holding the lock for each of the processes.


process/futexes.stp - System-Wide Futex Contention
keywords: syscall locking futex

  The script watches the futex syscall on the system. On exit the
  futexes address, the number of contentions, and the average time for
  each contention on the futex are printed from lowest pid number to
  highest.


= MEMORY =

memory/kmalloc-top - Show Paths to Kernel Malloc (kmalloc) Invocations
keywords: memory

  The kmalloc-top perl program runs a small systemtap script to collect
  stack traces for each call to the kmalloc function and counts the
  time that each stack trace is observed. When kmalloc-top exits it
  prints out sorted list. The output can be filtered to print only the
  first N stack traces (-t), stack traces with a minimum counts (-m),
  or exclude certain stack traces (-e).


memory/mmanonpage.stp - Track Virtual Memory System Actions on Anonymous Pages
keywords: memory

  The mmanonpage.stp script uses the virtual memory tracepoints
  available in some kernels to track the number of faults, user space
  frees, page ins, copy on writes and unmaps for anonymous pages. When
  the script is terminated the counts are printed for each process that
  allocated pages while the script was running. This script displays
  the anonymous page statistics for each process that ran while the
  script is active.  It's useful in debugging leaks in the anonymous
  regions of a process.


memory/mmfilepage.stp - Track Virtual Memory System Actions on File Backed Pages
keywords: memory

  The mmfilepage.stp script uses the virtual memory tracepoints
  available in some kernels to track the number of faults, copy on
  writes mapping, and unmapping operations for file backed pages. When
  the script is terminated the counts are printed for each process that
  allocated pages while the script was running. The mmfilepage.stp
  script is useful in debugging leaks in the mapped file regions of a
  process.


memory/mmreclaim.stp - Track Virtual Memory System Page Reclamation
keywords: memory

  The mmreclaim.stp script uses the virtual memory tracepoints
  available in some kernels to track page reclaim activity that
  occurred while the script was running. It's useful in debugging
  performance problems that occur due to page reclamation.


memory/mmwriteback.stp - Track Virtual Memory System Writing to Disk
keywords: memory

  The mmwriteback.stp script uses the virtual memory tracepoints
  available in some kernels to report all of the file writebacks that
  occur form kupdate, pdflush and kjournald while the script is
  running.  It's useful in determining where writes are coming from on
  a supposedly idle system that is experiencing unexpected IO.


memory/numa_faults.stp - Summarize Process Misses across NUMA Nodes
keywords: memory numa

  The numa_faults.stp script tracks the read and write pages faults for
  each process. When the script exits it prints out the total read and
  write pages faults for each process. The script also provide a break
  down of page faults per node for each process. This script is useful
  for determining whether the program has good locality (page faults
  limited to a single node) on a NUMA computer.


memory/overcommit.stp - Log failed process memory allocation due to overcommit limits
keywords: memory process

  The overcommit.stp script prints a line each time the kernel refuses
  a memory allocation request from a process because of
  /proc/sys/vm/overcommit* limits.


memory/pfaults.stp - Generate Log of Major and Minor Page Faults
keywords: memory

  The pfaults.stp script generates a simple log for each major and
  minor page fault that occurs on the system. Each line contains a
  timestamp (in microseconds) when the page fault servicing was
  completed, the pid of the process, the address of the page fault, the
  type of access (read or write), the type of fault (major or minor),
  and the elapsed time for page fault. This log can be examined to
  determine where the page faults are occurring.


memory/vm.tracepoints.stp - Collect slab allocation statistics
keywords: memory slab allocator

  The script will probe all memory slab/slub allocations and collects
  information about the size of the object (bytes requested) and
  user-space process in execution. When run over a period of time, it
  helps to correlate kernel-space memory consumption owing to
  user-space processes.


network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


= MONITORING =

general/varwatch.stp - Watch a variable changing value in a thread.
keywords: monitoring

  This script places a set of probes (specified by $1), each of which
  monitors the state of some context $variable expression (specified by
  $2).	Whenever the value changes, with respect to the active thread,
  the event is traced.


io/mbrwatch.stp - Monitor read/write of MBR (boot sector) area of block devices
keywords: io monitoring

   The mbrwatch.stp script reports any attempted reads/writes of the
  first few sectors of a raw block device.


io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitoring

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


= NETWORK =

network/autofs4.stp - Watch autofs4 operations
keywords: network autofs nfs

  Trace key autofs4 operations such as mounting or unmounting remote
  filesystems.


network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


network/netdev.stp - Trace Activity on Network Devices
keywords: network device traffic

  The netdev.stp script traces configuration and transmit/receive
  activity on network devices.


network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
keywords: network traffic per-process

  Every five seconds the nettop.stp script prints out a list of
  processed (PID and command) with the number of packets sent/received
  and the amount of data sent/received by the process during that
  interval.


network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


network/socket-trace.stp - Trace Functions called in Network Socket Code
keywords: network socket

  The script instruments each of the functions in the Linux kernel's
  net/socket.c file. The script prints out trace data. The first
  element of a line is time delta in microseconds from the previous
  entry. This is followed by the command name and the PID. The "->" and
  "<-" indicates function entry and function exit, respectively. The
  last element of the line is the function name.


network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: network tcp socket

  The tcp_connections.stp script prints information for each new
  incoming TCP connection accepted by the computer. The information
  includes the UID, the command accepting the connection, the PID of
  the command, the port the connection is on, and the IP address of the
  originator of the request.


network/tcp_trace.stp - Tcp connection tracing utility.
keywords: network trace

  This scripts traces a given tcp connection based on the filter
  parameters given by the user. The indexing is done by the 4 tuples
  local address, remote address, local port, remote port.


network/tcpdumplike.stp - Dump of Received TCP Packets
keywords: network traffic

  The tcpdumplike.stp prints out a line for each TCP packet received.
  Each line includes the source and destination IP addresses, the
  source and destination ports, and flags.


network/tcpipstat.stp - Display network statistics for individual TCP sockets.
keywords: network statistics

  tcpipstat collects and displays network statistics related to
  individual TCP sockets or groups of sockets.	The statistics that are
  collected are simular to that of the command netstat -s, only sorted
  and grouped by individual sockets.


= NFS =

network/autofs4.stp - Watch autofs4 operations
keywords: network autofs nfs

  Trace key autofs4 operations such as mounting or unmounting remote
  filesystems.


= NUMA =

memory/numa_faults.stp - Summarize Process Misses across NUMA Nodes
keywords: memory numa

  The numa_faults.stp script tracks the read and write pages faults for
  each process. When the script exits it prints out the total read and
  write pages faults for each process. The script also provide a break
  down of page faults per node for each process. This script is useful
  for determining whether the program has good locality (page faults
  limited to a single node) on a NUMA computer.


= PER-PROCESS =

io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitoring

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
keywords: network traffic per-process

  Every five seconds the nettop.stp script prints out a list of
  processed (PID and command) with the number of packets sent/received
  and the amount of data sent/received by the process during that
  interval.


= PROCESS =

memory/overcommit.stp - Log failed process memory allocation due to overcommit limits
keywords: memory process

  The overcommit.stp script prints a line each time the kernel refuses
  a memory allocation request from a process because of
  /proc/sys/vm/overcommit* limits.


process/cycle_thief.stp - Track IRQs and Other Processes Stealing Cycles from a Task
keywords: process scheduler time tracepoint interrupt

  The cycle_thief.stp script instruments the scheduler and IRQ handler
  to determine which processes and interrupts are competing with the
  specified task for the cpu cycles. This script uses the '-c' or '-x'
  options to focus on a specific task. The script output the number of
  times the task migrates between processors, histograms showing the
  length of time on and off processor, lists of processes running while
  the task is off the processor, and the interrupts that occurred while
  the task was running.


process/errsnoop.stp - tabulate system call errors
keywords: process syscall

  The script prints a periodic tabular report about failing system
  calls, by process and by syscall failure.  The first optional
  argument specifies the reporting interval (in seconds, default 5);
  the second optional argument gives a screen height (number of lines
  in the report, default 20).


process/forktracker.stp - Trace Creation of Processes
keywords: process scheduler

  The forktracker.stp script prints out a time-stamped entry showing
  each fork and exec operation on the machine. This can be useful to
  determine what process is creating a flurry of short-lived processes.


process/pfiles.stp - print process file descriptors
keywords: process files

  Run pfiles.stp to produce a human-readable summary of all open file
  descriptors of a given process.  Specify the process-id as -x PID for
  fastest performance.


process/plimit.stp - print resource limits
keywords: process

  The script prints a variety of resource limits for a given pid, like
  /proc/$$/limits on recent kernels.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends in running, sleeping,
  queuing, and waiting for io. On exit the script prints out the
  accumulated time for each state of processes observed.  Optionally,
  this script can be used with the '-c' or '-x' options to focus on a
  specific PID.


= PROFILING =

io/iodevstats.stp - List Executables Reading and Writing the Most Data by Device
keywords: io profiling

   The iodevstats.stp script measures the amount of data successfully
  read and written by all the executables for each io device on the
  system.  The output is sorted from greatest sum of bytes read and
  written to a device by an executable to the least. The output
  contains device major/minor number, the count of operations (reads
  and writes), the totals and averages for the number of bytes read and
  written.


io/iostat-scsi.stp - iostat for SCSI Devices
keywords: io profiling scsi

  The iostat-scsi.stp script provides a breakdown of the number of blks
  read and written on the machine's various SCSI devices. The script
  takes one argument which is the number of seconds between reports.


io/iostats.stp - List Executables Reading and Writing the Most Data
keywords: io profiling

   The iostat.stp script measures the amount of data successfully read
  and written by all the executables on the system.  The output is
  sorted from most greatest sum of bytes read and written by an
  executable to the least. The output contains	the count of operations
  (opens, reads, and writes), the totals and averages for the number of
  bytes read and written.


io/nfs_func_users.stp - Tally the Number of NFS Functions Used by Each Process
keywords: io profiling

  The nfs_func_users.stp script counts the uses of NFS functions in the
  kernel on a per process bases.  The output is sorted from the process
  with the greatest number of NFS functions called to the least. The
  output contains the executable name, the process number, and the
  total number of NFS functions called by the process.


process/pf2.stp - Profile kernel functions
keywords: profiling

  The pf2.stp script sets up time-based sampling. Every five seconds it
  prints out a sorted list with the top ten kernel functions with
  samples.


profiling/fntimes.stp - Show functions taking longer than usual
keywords: profiling

  The fntimes.stp script monitors the execution time history of a given
  function family (assumed non-recursive).  Each time (beyond a warmup
  interval) is then compared to the historical maximum.  If it exceeds
  a certain threshold (250%), a message is printed.


profiling/functioncallcount.stp - Count Times Functions Called
keywords: profiling functions

  The functioncallcount.stp script takes one argument, a list of
  functions to probe. The script will run and count the number of times
  that each of the functions on the list is called. On exit the script
  will print a sorted list from most frequently to least frequently
  called function.


profiling/sched_switch.stp - Display the task switches happening in the scheduler
keywords: profiling functions

  The sched_switch.stp script takes two arguments, first argument can
  be "pid" or "name" to indicate what is being passed as second
  argument. The script will trace the process based on pid/name and
  print the scheduler switches happening with the process. If no
  arguments are passed, it displays all the scheduler switches. This
  can be used to understand which tasks schedule out the current
  process being traced, and when it gets scheduled in again.


profiling/thread-times.stp - Profile kernel functions
keywords: profiling

  The thread-times.stp script sets up time-based sampling.  Every five
  seconds it prints out a sorted list with the top twenty threads
  occupying the CPUs, broken down as a percentage of user and kernel
  time.


profiling/timeout.stp - Show Processes Doing Polling Operations
keywords: profiling

  The timeout.stp script is based on a blog entry
  (http://udrepper.livejournal.com/19041.html) mentioning a need for a
  tool to help developers find applications that are polling. The
  timeout.stp script monitors systemcall used for polling and records
  the systemcalls that timed out rather than returned because some
  action occurred. The script updates the screen once a second with the
  top twenty processes.


profiling/topsys.stp - Show Processes Doing Polling Operations
keywords: profiling

   The topsys.stp script lists out the top twenty systemcalls for the
  previous 5 seconds. The output is sorted from most frequent to least
  frequent.


= READ =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spent in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parentheses. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


= SCHEDULER =

process/chng_cpu.stp - Monitor Changes in Processor Executing a Task
keywords: scheduler

  The chng_cpu.stp script takes an argument which is the executable
  name of the task it should monitor. Each time a task with that
  executable name is found running on a different processor, the script
  prints out the thread id (tid), the executable name, the processor
  now running the task, the thread state, and a backtrace showing the
  kernel functions that triggered the running of the task on the
  processor.


process/cycle_thief.stp - Track IRQs and Other Processes Stealing Cycles from a Task
keywords: process scheduler time tracepoint interrupt

  The cycle_thief.stp script instruments the scheduler and IRQ handler
  to determine which processes and interrupts are competing with the
  specified task for the cpu cycles. This script uses the '-c' or '-x'
  options to focus on a specific task. The script output the number of
  times the task migrates between processors, histograms showing the
  length of time on and off processor, lists of processes running while
  the task is off the processor, and the interrupts that occurred while
  the task was running.


process/forktracker.stp - Trace Creation of Processes
keywords: process scheduler

  The forktracker.stp script prints out a time-stamped entry showing
  each fork and exec operation on the machine. This can be useful to
  determine what process is creating a flurry of short-lived processes.


process/migrate.stp - Track the Migration of Specific Executables
keywords: scheduler

  The migrate.stp script takes an argument which is the executable name
  of the task it should monitor. Each time a task with that executable
  name migrates between processors an entry is printed with the process
  id (pid), the executable name, the processor off loading the task,
  and the process taking the task. Note that the task may or may not be
  executing at the time of the migration.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends in running, sleeping,
  queuing, and waiting for io. On exit the script prints out the
  accumulated time for each state of processes observed.  Optionally,
  this script can be used with the '-c' or '-x' options to focus on a
  specific PID.


process/sleepingBeauties.stp - Generating Backtraces of Threads Waiting for IO Operations
keywords: io scheduler backtrace

  The script monitors the time that threads spend in waiting for IO
  operations (in "D" state) in the wait_for_completion function.  If a
  thread spends over 10ms, its name and backtrace is printed, and later
  so is the total delay.


= SCSI =

io/iostat-scsi.stp - iostat for SCSI Devices
keywords: io profiling scsi

  The iostat-scsi.stp script provides a breakdown of the number of blks
  read and written on the machine's various SCSI devices. The script
  takes one argument which is the number of seconds between reports.


= SIGNALS =

process/sig_by_pid.stp -  Signal Counts by Process ID
keywords: signals

  Print signal counts by process ID in descending order.


process/sig_by_proc.stp -  Signal Counts by Process Name
keywords: signals

  Print signal counts by process name in descending order.


process/sigkill.stp - Track SIGKILL Signals
keywords: signals

  The script traces any SIGKILL signals. When that SIGKILL signal is
  sent to a process, the script prints out the signal name, the
  destination executable and process ID, the executable name and user
  ID that sents the signal.


process/sigmon.stp - Track a particular signal to a specific process
keywords: signals

  The script watches for a particular signal sent to a specific
  process. When that signal is sent to the specified process, the
  script prints out the PID and executable of the process sending the
  signal, the PID and executable name of the process receiving the
  signal, and the signal number and name.


= SIMPLE =

general/helloworld.stp - SystemTap "Hello World" Program
keywords: simple

  A basic "Hello World" program implemented in SystemTap script. It
  prints out "hello world" message and then immediately exits.


= SLAB =

memory/vm.tracepoints.stp - Collect slab allocation statistics
keywords: memory slab allocator

  The script will probe all memory slab/slub allocations and collects
  information about the size of the object (bytes requested) and
  user-space process in execution. When run over a period of time, it
  helps to correlate kernel-space memory consumption owing to
  user-space processes.


= SLEEP =

process/sleeptime.stp - Trace Time Spent in nanosleep Syscalls
keywords: syscall sleep

  The script watches each nanosleep syscall on the system. At the end
  of each nanosleep syscall the script prints out a line with a
  timestamp in microseconds, the pid, the executable name in
  parentheses, the "nanosleep:" key, and the duration of the sleep in
  microseconds.


= SOCKET =

network/socket-trace.stp - Trace Functions called in Network Socket Code
keywords: network socket

  The script instruments each of the functions in the Linux kernel's
  net/socket.c file. The script prints out trace data. The first
  element of a line is time delta in microseconds from the previous
  entry. This is followed by the command name and the PID. The "->" and
  "<-" indicates function entry and function exit, respectively. The
  last element of the line is the function name.


network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: network tcp socket

  The tcp_connections.stp script prints information for each new
  incoming TCP connection accepted by the computer. The information
  includes the UID, the command accepting the connection, the PID of
  the command, the port the connection is on, and the IP address of the
  originator of the request.


= STATISTICS =

network/tcpipstat.stp - Display network statistics for individual TCP sockets.
keywords: network statistics

  tcpipstat collects and displays network statistics related to
  individual TCP sockets or groups of sockets.	The statistics that are
  collected are simular to that of the command netstat -s, only sorted
  and grouped by individual sockets.


= SYSCALL =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spent in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parentheses. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


process/errsnoop.stp - tabulate system call errors
keywords: process syscall

  The script prints a periodic tabular report about failing system
  calls, by process and by syscall failure.  The first optional
  argument specifies the reporting interval (in seconds, default 5);
  the second optional argument gives a screen height (number of lines
  in the report, default 20).


process/futexes.stp - System-Wide Futex Contention
keywords: syscall locking futex

  The script watches the futex syscall on the system. On exit the
  futexes address, the number of contentions, and the average time for
  each contention on the futex are printed from lowest pid number to
  highest.


process/sleeptime.stp - Trace Time Spent in nanosleep Syscalls
keywords: syscall sleep

  The script watches each nanosleep syscall on the system. At the end
  of each nanosleep syscall the script prints out a line with a
  timestamp in microseconds, the pid, the executable name in
  parentheses, the "nanosleep:" key, and the duration of the sleep in
  microseconds.


process/syscalls_by_pid.stp - System-Wide Count of Syscalls by PID
keywords: syscall

  The script watches all syscall on the system. On exit the script
  prints a list showing the number of systemcalls executed by each PID
  ordered from greatest to least number of syscalls.


process/syscalls_by_proc.stp - System-Wide Count of Syscalls by Executable
keywords: syscall

  The script watches all syscall on the system. On exit the script
  prints a list showing the number of systemcalls executed by each
  executable ordered from greatest to least number of syscalls.


process/wait4time.stp - Trace Time Spent in wait4 Syscalls
keywords: syscall wait4

  The script watches each wait4 syscall on the system. At the end of
  each wait4 syscall the script prints out a line with a timestamp in
  microseconds, the pid, the executable name in parentheses, the
  "wait4:" key, the duration of the wait and the PID that the wait4 was
  waiting for. If the waited for PID is not specified , it is "-1".


= TCP =

network/sk_stream_wait_memory.stp - Track Start and Stop of Processes Due to Network Buffer Space
keywords: network tcp buffer memory

  The sk_stream-wait_memory.stp prints a time stamp, executable, and
  pid each time a process blocks due to the send buffer being full. A
  similar entry is printed each time a process continues because there
  is room in the buffer.


network/tcp_connections.stp - Track Creation of Incoming TCP Connections
keywords: network tcp socket

  The tcp_connections.stp script prints information for each new
  incoming TCP connection accepted by the computer. The information
  includes the UID, the command accepting the connection, the PID of
  the command, the port the connection is on, and the IP address of the
  originator of the request.


= TIME =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spent in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parentheses. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.


process/cycle_thief.stp - Track IRQs and Other Processes Stealing Cycles from a Task
keywords: process scheduler time tracepoint interrupt

  The cycle_thief.stp script instruments the scheduler and IRQ handler
  to determine which processes and interrupts are competing with the
  specified task for the cpu cycles. This script uses the '-c' or '-x'
  options to focus on a specific task. The script output the number of
  times the task migrates between processors, histograms showing the
  length of time on and off processor, lists of processes running while
  the task is off the processor, and the interrupts that occurred while
  the task was running.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends in running, sleeping,
  queuing, and waiting for io. On exit the script prints out the
  accumulated time for each state of processes observed.  Optionally,
  this script can be used with the '-c' or '-x' options to focus on a
  specific PID.


= TRACE =

general/para-callgraph.stp - Callgraph tracing with arguments
keywords: trace callgraph

  Print a timed per-thread callgraph, complete with function parameters
  and return values.  The first parameter names the function probe
  points to trace.  The optional second parameter names the probe
  points for trigger functions, which acts to enable tracing for only
  those functions that occur while the current thread is nested within
  the trigger.


network/tcp_trace.stp - Tcp connection tracing utility.
keywords: network trace

  This scripts traces a given tcp connection based on the filter
  parameters given by the user. The indexing is done by the 4 tuples
  local address, remote address, local port, remote port.


= TRACEPOINT =

network/dropwatch.stp - Watch Where Socket Buffers are Freed in the Kernel
keywords: network tracepoint buffer free

  Every five seconds the dropwatch.stp script lists the number of
  socket buffers freed at locations in the kernel.


process/cycle_thief.stp - Track IRQs and Other Processes Stealing Cycles from a Task
keywords: process scheduler time tracepoint interrupt

  The cycle_thief.stp script instruments the scheduler and IRQ handler
  to determine which processes and interrupts are competing with the
  specified task for the cpu cycles. This script uses the '-c' or '-x'
  options to focus on a specific task. The script output the number of
  times the task migrates between processors, histograms showing the
  length of time on and off processor, lists of processes running while
  the task is off the processor, and the interrupts that occurred while
  the task was running.


process/schedtimes.stp - Track Time Processes Spend in Various States using Tracepoints
keywords: process scheduler time tracepoint

  The schedtimes.stp script instruments the scheduler to track the
  amount of time that each process spends in running, sleeping,
  queuing, and waiting for io. On exit the script prints out the
  accumulated time for each state of processes observed.  Optionally,
  this script can be used with the '-c' or '-x' options to focus on a
  specific PID.


= TRAFFIC =

network/netdev.stp - Trace Activity on Network Devices
keywords: network device traffic

  The netdev.stp script traces configuration and transmit/receive
  activity on network devices.


network/nettop.stp - Periodic Listing of Processes Using Network Interfaces
keywords: network traffic per-process

  Every five seconds the nettop.stp script prints out a list of
  processed (PID and command) with the number of packets sent/received
  and the amount of data sent/received by the process during that
  interval.


network/tcpdumplike.stp - Dump of Received TCP Packets
keywords: network traffic

  The tcpdumplike.stp prints out a line for each TCP packet received.
  Each line includes the source and destination IP addresses, the
  source and destination ports, and flags.


= TTY =

io/ttyspy.stp - Monitor tty typing.
keywords: io tty per-process monitoring

  The ttyspy.stp script uses tty_audit hooks to monitor recent typing
  activity on the system, printing a scrolling record of recent
  keystrokes, on a per-tty basis.


= USE =

general/graphs.stp - Graphing Disk and CPU Utilization
keywords: disk cpu use graph

  The script tracks the disk and CPU utilization. The resulting output
  of the script can be piped into gnuplot to generate a graph of disk
  and CPU USE.


= WAIT4 =

process/wait4time.stp - Trace Time Spent in wait4 Syscalls
keywords: syscall wait4

  The script watches each wait4 syscall on the system. At the end of
  each wait4 syscall the script prints out a line with a timestamp in
  microseconds, the pid, the executable name in parentheses, the
  "wait4:" key, the duration of the wait and the PID that the wait4 was
  waiting for. If the waited for PID is not specified , it is "-1".


= WRITE =

io/iotime.stp - Trace Time Spent in Read and Write for Files 
keywords: syscall read write time io

  The script watches each open, close, read, and write syscalls on the
  system. For each file the scripts observes opened it accumulates the
  amount of wall clock time spent in read and write operations and the
  number of bytes read and written. When a file is closed the script
  prints out a pair of lines for the file. Both lines begin with a
  timestamp in microseconds, the PID number, and the executable name in
  parentheses. The first line with the "access" keyword lists the file
  name, the attempted number of bytes for the read and write
  operations. The second line with the "iotime" keyword list the file
  name and the number of microseconds accumulated in the read and write
  syscalls.