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Q � Q �#o ]%�SWatch IO Activity on a Particular Devicetraceio2.stpioPrint out the executable name and process number as reads and writes to the specified device occur.io�n g!?�eTrace Time Spent in Read and Write for Files iotime.stpprofiling syscall io fileThe 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
� �Q�U� � �g i!!�9Graphing Disk and CPU Utilization with gnuplotgraphs.stpmonitoringThe script tracks the disk and CPU utilization. It prints a stream of data which, when piped directly into gnuplot, draws historical curves for each.general� 1 �9 block breaker gameblock.stpstapgamesA block game where you progressively break the ceiling blocks until clearing the levelstapgamesw '% � pingpong gamepingpong.stpstapgamesA simulated ball bounces around the terminal reflecting at the edgesstapgames� +�5 20482048.stp_best stapgamesThe modern classic 2048 sliding-tiles game, using local keyboard and ansi animation.stapgamesa % s life gamelifegame.stpstapgameswatch as your creation morphes into different formsstapgamesJ ! I eater gameeater.stpstapgameswalk through a maze, eat stuffstapgames t = ; : 9 8 7 6 5 4 3 2 1 0 / . - K _ b � o � Y h P t � � � � � v � e � Q ] � h t � � P � � � � v [ � � T � � ] � � v W � � [ G � C � ! � ! � � C � � < G [ m B G < � � � � I C C I � � � � � � � C � � � � � � p p C � � � � � ? p ) � g � X � � � g � ) s p �
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� � � ��" c+�Track Virtual Memory System Writing to Diskmmwriteback.stpmemoryThe 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�k�! Q1/�=Collect Slab Allocation Statisticsvm.tracepoints.stpmemory statisticsThe 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.memory
� �� � �h4 cAA�System-Wide Count of Network Packets by IPsnetfilter_summary_json.stp_best network traffic jsonThe script watches all IPv4 network traffic on the system. The data is output in JSON format and includes the number of packets sent along source IP address / destination IP address pair encountered, and the total number of bytes sent among the pair.network�%3 K91�+print tcp retransmission packettcp_retransmission.stptcp retransmissionThe tcp_retransmission.stp prints out a line for each tcp retransmission packetnetwork�[2 �?3�QTrack Start and Stop of Processes Due to Network Buffer Spacesk_stream_wait_memory.stpnetwork tcp processThe 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
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[ [ �!�) a'+�! Show Time Spent on Each Line of a Functionlinetimes.stpprofiling _bestThe linetimes.stp script takes two arguments: where to find the function and the function name. linetimes.stp will instrument each line in the function. It will print out the number of times that the function is called, a table with the average and maximum time each line takes, and control flow information when the script exits.profiling
� �� � : I''�TCP Connection Tracing Utilitytcp_trace.stpnetwork traceThis 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�Y9 w'1�yDisplay Network Statistics for Individual TCP Socketstcpipstat.stpnetwork statisticsThe tcpipstat script 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.network
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� � � �� E#7�-System-Wide Futex Contentionfutexes.stpsyscall locking futexThe script watches the futex syscall on the system. On exit the futex's address, the number of contentions, and the average time for each contention on the futex are printed from lowest pid number to highest.process�U� s-/�qTrack Creation of Processes by process and execnamespawn_seeker.stpprocess schedulerThe spawn_seeker.stp script every minute (and on exit) prints out the local time and sorted lists of which processes and executables spawned tasks during the previous minute. This can be useful to determine what process is creating a flurry of short-lived processes. When a process exits its count of tasks created is added to its parent's count to better account for the indirect task creation by children processes. For more detailed examination of task creation consider using forktracker.stp.process
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� . � �yu k!�aTrack a Particular Signal to a Specific Processsigmon.stpsignalsThe 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.process�Ot c# �Track the Migration of Specific Executablesmigrate.stpschedulerThe 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
� \0 � pE G'yTracing of PHP code executionphp-trace.stptraceTrace of executing PHP code using the enabled markers.apps�)D S+)�AKeep track of NFS server statisticsnfsd-recent.stpnfs statisticsThis script tracks all nfsd server operations by client_ip address, and periodically lists those clients that have made recent requests. It's a way of finding out which nfs clients might be considered still connected.network�!C ;3+�?Network packet contentspacket_contents.stpnetwork trafficThe packet_contents.stp script displays the length of each network packet and its contents in both hexadecimal and ASCII. Systemtap strings are MAXSTRINGLEN in length by default which may not be enough for larger packets. In order to print larger packets, this limit can be increased by passing in the "-DMAXSTRINGLEN=65536" command line option.network
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� � �R� � ;�GSummarize the time each process spends doing copy on write for huge pageshugepage_cow_delays.stpmemoryThe system may attempt to reduce memory use by having two or more difference processes share the same writeable page in memory. However, when one of the processes write to shared page that is marked copy on write (COW) the page must be duplicated and then modified. On x86_64 machines the huge pages are 2MB in size, 512 times larger than a normal 4KB page. Thus, copy on write operation on a huge page can delay program execution by a hundred or more microseconds and maybe noticeable to latency sensitive programs. This script will tally the number of times that each process triggers a huge page copy on write, the total time in microseconds spent copying the pages, and the average time in microseconds of the huge page copy.memory
�" � @ ]-9�SShow Process Ancestry for IP Connectionsconnect_stat.stpnetwork socket processThe connect_stat.stp script prints a task's entire ancestry (parent process name/uid/gid) whenever it attempts an outgoing socket connection to a given IP address.network�? a31�UTrack Creation of Incoming TCP Connectionstcp_connections.stpnetwork tcp socketThe 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�V> e/;�sIncrease Initial TCP Congestion Window to 10tcp_init_cwnd.stpnetwork tcp socket guruRun the tcp_init_cwnd.stp script in the background to override a kernel's default tcp cwnd value to 10, which has been found to improve latency for web server type workloads. The script prints a count of cwnd value changes when it is stopped.network
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� �a� I!%�IPrint Process File Descriptorspfiles.stpprocess fileRun 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�� c#G�OGenerate backtraces for kernel audit eventsauditbt.stpmonitoring security backtraceAttaches to the kernel audit-log paths (also used by libaudit), and log every record being sent, along with a user-space backtrace of the process that caused it.process
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� � �4�. G �y Profile Kernel/User Functionspf3.stpprofilingThe pf3.stp script sets up time-based sampling. Every five seconds it prints out a sorted list with the top twenty kernel and/or user functions with samples. Use any of --ldd, --all-modules, -d MODULE, -d /PATH/TO/EXEC to add more symbolic info.profiling
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�C� �1�OLog the kernel splitting huge pages into normal sized pageshugepage_split.stpmemoryBecause some portions of the kernel code only work with normal-sized pages the kernel may convert a huge page into a set of normal-sized pages using a split operation. This operation may be relatively expensive and noticeable to latency sensitive programs. You can identify if split operations are occurring with the systemtap hugepage_split.stp script.memory�+� �-/� Print trace of process ancestors for matching exec commandspstrace_exec.stpprocess backtraceThe pstrace_exec.stp script watches each exec operation. If the exec contains a substring that matches the script's command-line argument, it prints out that process and all of its ancestors.process
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G �7 G �ms ]!+�GGenerates a process diagram in DOT form.pstree.stpprocess diagramThe pstree.stp script generates a process diagram in DOT form. For instance, it may be useful on a 'make' command to see all the processes that are started.processzr I+} Signal Counts by Process Namesig_by_proc.stpsignalsPrint signal counts by process name in descending order.process�aq Y'/�)Trace Time Spent in Nanosleep Syscallssleeptime.stpsyscall nanosleepThe 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�fp ;37�=monitor syscall historythread-business.stp_best process syscallPrints a periodic tabular report about the counts of syscall activity of all threads on the system, along with a textual recent-syscall-history for eachprocess �# ocking� g� trace
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� � � �a� � )O�UTrack Time Processes Spend in Various States Using Tracepointsschedtimes.stpprocess scheduler time tracepointThe 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 and its children.process�n� �3W�cMonitor process creation/termination and module [un]loadingprocmod_watcher.stpprocess monitoring syscall tracepointThe procmod_watcher.stp script monitors calls to fork(), exec(), exit(), init_module(), and delete_module(). Event-specific details are also printed out (e.g. for exec(), the file being exec'ed). This script does not require debuginfo.process
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G' �#Callgraph Tracing of Tcl codetcl-trace.stpcallgraphPrint a timed per-thread microsecond-timed callgraph of executing Tcl code.general�> /'9�Callgraph Tracingcallgraph.stpsimple trace callgraphPrint a timed per-thread microsecond-timed nested callgraph. The first parameter names the function probe points to trace.general�2 /) �Profile Tcl callstcl-funtop.stpprofilingThe tcl-funtop.stp script displays a top-like view of most frequently used Tcl functions for the each five second interval.general�9 c%-�SWatch a Variable Changing Value in a Threadvarwatch.stp_best monitoringThis 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.general
$ X $ �1 S%1�OWatchdog Timer for Arbitrary Eventswatchdog.stpwatchdog backtraceThe watchdog.stp script provides a watchdog timer mechanism for arbitrary events. The script takes three arguments: the events to start watchdog timer, the event to stop the watchdog timer, and the time in millseconds for the watchdog. If the watchdog timer is exceed, the script will trigger a stack backtrace of the user-process that timed out using pstack. This script can be used to diagnose what the userspace application is doing when a slower than expected operation occurs.general�% =33�=Function Time Statisticsfunc_time_stats.stpfunction statisticsThe func_time_stats.stp script tracks the wall clock time for each invocation of the function probe listed as the first command line argument. When the script exits it prints out the minimum, average, and maximum times in microseconds followed by a count of times that the function was called and a histogram showing the distributions of times.general
� �� �H M/�Tracing glib2 memory allocationsgmalloc_watch.stptraceThe gmalloc_watch.stp script from Colin Walters' blog (https://blog.verbum.org/2011/03/19/analyzing-memory-use-with-systemtap/) traces the allocation of glib2 memory using the markers in glib2.apps�lG =1/�WTrace libguestfs startuplibguestfs_log.stpapplication traceThe libguestfs_log.stp script prints a log of when various libgueststartup steps are encountered. The first column is microseconds since the script started. The second column is the time elapsed in microseconds between the previous and current events and the third column is the event name.apps sure quantity between different probe points, aggregate the measurements, and display the results. The first argument to the script is the quantity to measure such as time in microseconds via "gettimeofday_us()". There could be multiple intervals being measured concurrently and the second argument is the means to match the start probe points listed in the fourth argument with the end probes listed in the fifth argument. The third argument is how to display the aggregated data. The data could be displayed as a sum (@sum), an average (@avg), or a histogram (@hist_log). The fourth and fifth arguments are lists of probes marking the start and end of an interval. An optional sixth argument allows grouping of the intervals. One could use "tid()" for the matching argument to measure the intervals on a per-thread basis, but then use "execname()" for the optional argument to group the measurements by executable name. If there is no sixth argument, all the intervals are aggregated into a single entry.general
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� &$� � �%/ O!+�ETrace Activity on Network Devicesnetdev.stpnetwork trafficThe netdev.stp script traces configuration and transmit/receive activity on network devices.network� . =##�+Watch autofs4 Operationsautofs4.stpnetwork nfsTrace key autofs4 operations such as mounting or unmounting remote filesystems.network�- M++�qDump of Received UDP/TCP Packetstcpdumplike.stpnetwork trafficThe tcpdumplike.stp prints out a line for each TCP & UDP packet received. Each line includes the source and destination IP addresses, the source and destination ports, and flags.network�W, q'?�mWatch Where Socket Buffers Are Freed in the Kerneldropwatch.stpnetwork tracepoint socketEvery five seconds the dropwatch.stp script lists the number of socket buffers freed at locations in the kernel.network
� �Y � �A� 5!�'uprobes-based ltraceltrace.stpprocessThe ltrace.stp script lists calls that the designated process makes through PLTs (procedure linkage tables), generally into shared libraries.process�� Q'+�'Trace Time Spent in wait4 Syscallswait4time.stpsyscall processThe 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".process�� U3�}System-Wide Count of Syscalls by PIDsyscalls_by_pid.stpsyscallThe 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
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)Time Statistics on KVM Exit Reasonskvm_service_time.stp_best virtualization kvmThe kvm_service_time.stp script tracks the statistics about the amount of time that the processor left the guest virtual machine for each exit reason (for example fixing up a page table or handling an IO operation). When the script exits it prints out the number of times each exit reason was encountered, the total duration of time it left the guest VM, the minimum time, the average time, and the maximum time in microseconds for that exit reason. On Linux 2.6.38 and newer kernel the script can automatically determine whether it is running on Intel or AMD processors. For older kernels with a kernel.trace("kvm_exit") tracepoint that does not have the $isa parameter you can explicitly state the kvm type with a "-G kvm=intel" or "-G kvm=amd" on the command line.virtualization
� ] � � M3!�Measure intervals between eventsmeasureinterval.stpmonitoringThe measureinteval.stp script allows quick creation of instrumentation to mea *�@ M+�Color Table for ansi_set_color()ansi_colors.stpformatThe script prints a table showing the available color combinations for the ansi_set_color() function in the ansi.stp tapset.general�] ]A+�Callgraph Tracing with Verbose Argumentspara-callgraph-verbose.stptrace callgraphPrint a timed per-thread microsecond-timed callgraph, complete with pretty-printed 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.general
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~ [++{Watch semop(2)/semtimedop(2) operationssemop-watch.stpprocess lockingPrints a timed trace of semop(2)/semtimedop(2) syscallsprocess�T} }59�SGenerate Backtraces of Threads Waiting for IO OperationssleepingBeauties.stpio scheduler backtraceThe 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.process
� % � �@� e'�sTrack Virtual Memory System Page Reclamationmmreclaim.stpmemoryThe 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�W� a+#�Summarize Process Misses across NUMA Nodesnuma_faults.stpmemory numaThe 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
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H H �:_ q#%�[List Executables Reading and Writing the Most Dataiostats.stpio 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�x^ �)%�;List Executables Reading and Writing the Most Data by Deviceiodevstats.stpio 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
T T �,1 � +E�qTrace threads sending network traffic to given host and/or portwho_sent_it.stpnetwork trace traffic simpleThis script traces outgoing network packets using the netfilter probes (not requiring debuginfo), printing the source thread name/id and destination host:port. It may be filtered with the_dport and the_daddr globals, e.g., to watch only for DNS traffic (port 53), and/or only to the localhost (127.0.0.1).network�z0 o+ �SFind Which Client Is Removing NFS Files on Servernfsd_unlink.stpnfs diskThe nfsd_unlink.stp script lists the ip address and file name each time time a file is being removed or unlinked by the nfsd. This script is run on the nfs server.network
P �1 P �]�' [! �1 Show Processes Doing Polling Operationstopsys.stpprofiling 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.profiling�S�& [#+� Show Functions Taking Longer Than Usualfntimes.stp_best profilingThe 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�t�% M71�E Count Times Functions Are Calledfunctioncallcount.stpprofiling functionThe 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
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T @�� T �" �+'�YTrace slow file system synchronous reads and writes (non-debuginfo)fsslower-nd.stpio filesystemThis dynamically traces two common file system functions: do_sync_read() and do_sync_write(), and shows details of each call that is slower than a threshold. Many, but not all, file systems and workloads use these functions. Tracing their time provides one view of suffered file system latency.lwtools�F! K)%� SystemTap "Hello World" Programhelloworld.stp_best simpleA basic "Hello World" program implemented in SystemTap script. It prints out "hello world" message and then immediately exits.general� O)�SystemTap python 3 support tapsetpy3example.stpsimpleA python support tapset that displays backtraces and variable valuesgeneral�= /##�Hack the keyboardkeyhack.stpsimple guruThis script makes it appear that one's keyboard is broken, by changing keycodes at the kernel device driver level. Annoy your friends!general
� �� � �z c5� System-Wide Count of Syscalls by Executablesyscalls_by_proc.stpsyscallThe 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�Ty g%�System-Wide Syscall Statistics with FilteringsyscalltimessyscallCombination shell/systemtap script to measure system call counts and times. Can be filtered by process IDs, process names and users.process�[x C%+�9Tabulate System Call Errorserrsnoop.stpprocess syscallPrints 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
} � } ��8 =-+�' Profile Kernel Functionsthread-times.stp_best profilingThe 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�f�7 o)+� Show Reasons and Durations for Processes Sleepinglatencytap.stp_best profilingThe latencytap.stp script collects data on the intervals processes are deactivated (sleeping). The script categorizes the reasons for the sleeps by analyzing the backtraces and displays a sorted list of the top 20 causes from largest total sum time sleeping to smallest. The output is updated every 30 seconds. The script needs to be compiled with the '--all-modules' option to produce reasons for sleeps caused by modules. Optionally, this script can be used with the '-c' or '-x' options to focus on a specific PID.profiling
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� � � � [1'�qCount I/O Syscalls using Alias Suffixesalias_suffixes.stpio statisticsalias_suffixes.stp is a demonstration of how alias suffixes in the systemtap language might be used. The script tracks the wall clock time for each invocation of the system calls open, close, read, and write. When the script exists it prints out the minimum, average, and maximum times in microseconds for each system call, followed by a count of times that each syscall was invoked and a histogram showing the distributions of times.general�q Q)W�'Interactive Count Specified Eventseventcount.stpinteractive statistics thread processThe script periodically prints a count of specified events and their related tid's over the course of execution. Numerous configuration options exist to control filtering / reporting, some of which can be modified at runtime. See the script source for more information.general
� |� �p[ 7# �Trace slow vfs opens.slowvfs.stpio simpleThis script prints a line for every kernel vfs_open operation that takes longer than a configurable number of microseconds. Highly contended or remote filesystems are likelier to hit this.io�Z i3�] Tally Backtraces for Inter-Processor Interruptscf.stpinterrupt backtraceThe 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.interrupt
� � �A�( �1W�w Provide a per-process accumulation of syscall latency on the systemsyscalllatency.stpprometheus process syscall tracepointThe syscalllatency.stp script accumulates syscall latency for each running process. This information can be useful to whether excessive time is being spent in particular syscalls on the system. The script makes the information available via procfs in Prometheus readable format. When a process exits its data will be eliminated from the prometheus output. To avoid exceeding the storage limitations of SystemTap older entries maybe overwritten by newer entries. This can lead to some active process syscall error counts disappearing and/or later reappearing with a lower value. Also note that the script does not properly name syscalls for 32-bit applications running on 64-bit machines.profiling
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�| 1!7�Trace system callsstrace.stp_best process syscallThe script loosely emulates strace, when applied to individual processes or hierarchies (via -c/-x), or the entire system (without -c/-x). A few output configuration parameters may be set with -G.process�h{ g% �;Monitor Changes in Processor Executing a Taskchng_cpu.stpschedulerThe 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
� � �3�* {9W�m Provide a per-process syscall error tally on the systemsyscallerrorsbypid.stpprometheus process syscall tracepointThe syscallerrorsbypid.stp script tallies syscall errors for each running process. This information can be useful to whether there are excessive errors for various processes on the system. The script makes the information available via procfs in Prometheus readable format. When a process exits its data will be eliminated from the prometheus output. To avoid exceeding the storage limitations of SystemTap older entries maybe overwritten by newer entries. This can lead to some active process syscall error counts disappearing and/or later reappearing with a lower value. Also note that the script does not properly name syscalls for 32-bit applications running on 64-bit machines.profiling
� � ��+ �3C�9 Monitor capabilities and syscalls used by a process and it childrencontainer_check.stpprofiling container syscallThe container_check.stp script monitors the use of linux capablities and optionally forbidden syscalls by a process and its children. On exit the script prints out lists showing the capabilies used by each executable, which syscall used specific capabilites for each executable, a list of forbidden syscalls used, and details on any syscalls that failed during monitoring. This script is designed to help diagnose issues caused by restricted capabilies and syscalls when running an application in a container. If the script warns about skipped probes, the number of active kretprobes may need to be increased with "-DKRETACTIVE=100" option on the command lineprofiling
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� �� � � A)c�wWhy did the function fail?whythefail.stpspeculation monitoring function trace _bestThe whythefail.stp script prints a statement-execution trace for a given function, but only for those runs of the function that ended up with a (configurable) post-return condition.general�, 3#+�mBad Filename Filterbadname.stpfilesystem guruThe badname.stp script shows how one could prevent the creation of files with undesirable names using guru mode.general�t Q/)�UTrace Socket Activity of a Processsocket-events.stpsocket syscallPrints the life cycle of all sockets associated with a process. This includes bytes and timing. The timing information that is tracked includes event completion relative to the start of said event and the end of the previous event. Currently tracks read, write, recv, send, connect and close.general odule� nitort ing� s
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� � �0L W�mTracing Contention on Big Kernel Lockbkl.stplockingThe 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 two arguments. The first one is optional, and used to enable backtraces, and print them once a process has been holding the BKL for a user specified number of nseconds is reached. The second option is compulsory and 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. If backtraces are enabled, a backtrace will be printed as well.locks
k � k �' 5�{make keyboard noiseskey.stpsimpleFor fans of Leroy Anderson and Typewriters only, this script arranges to play a click or a zing for various keystrokes.general�Y A!/�7Print the Size of a C Typesizeof.stpstatistics memoryThis script prints the size of a type, based on dwarf debuginfo for any kernel or userspace module, or trial-compilation of a given header file name.general� Y9G�UInteractive Print the Size of a C Typesizeof_interactive.stpstatistics memory interactiveThis script prints the size of a type, based on dwarf debuginfo for any kernel or userspace module, or trial-compilation of a given header file name. Types and corresponding locations are provided to the script at runtime via keyboard input. The format of the input is identical to that of sizeof.stp (see script source for more information). Types and locations can be repeatedly given until the process is terminated. general
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� � � �{ e-�aShow Attribues in Table for ansi_set_color()ansi_colors2.stpformatThe script prints a table showing the available attributes (bold, underline, and inverse) with color combinations for the ans_set_color() function in the ansi.stp tapset.general� �+�OSee the amount of wall clock time a process spends in various statesstopwatches.stptimeThe stopwatch.stp script illustrates how to use multiple stopwatches record how much wallclock time a process spends in kernel- and user-space. On exit the script prints out the time in seconds, milliseconds, microseconds, and nanoseconds. Note that this output of this script is not directly comparable to the time command because time records the time that the process is actually active in kernel- and user-space.general
y 4� y �j I+/�#IO Statistics for SCSI Devicesiostat-scsi.stpio profiling scsiThe 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�"i y1%�Tally the Number of NFS Functions Used by Each Processnfs_func_users.stpio profilingThe 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�Ih '')�;disable fsynceatmydata.stpio guru simpleSuppresses fsync() syscalls from processes identified by stap -c/-x by turning them into presumed-faster fsync() on some dummy or other file descriptorio
� �� �+o�yTrack IRQ's and Other Processes Stealing Cycles from a Taskcycle_thief.stp_best process scheduler time tracepoint interruptThe 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�i�
O5�Ipthread mutex contention analysismutex-contention.stplockingTracks pthread-mutex initialization/use and underlying futex operations, to identify (with backtraces/symbol-names) the mutexes suffering most contention. Invoke with "-d SHLIB --ldd", perhaps with -DMAXMAPENTRIES=NNNN for some large NNNN, if the arrays overflow due to heavy activity.process
Mini Shell