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Your current IP address is 8.222.208.146. </p> <div class="paragraphbreak" style="margin-top:0.5em"></div><div style="font-size: 16px;"> <p>Even while globally blocked, you will <i>usually</i> still be able to edit pages on <a href="https://meta.wikimedia.org/wiki/" class="extiw" title="m:">Meta-Wiki</a>. </p> </div> <div class="paragraphbreak" style="margin-top:0.5em"></div><div style="font-size: 16px;"> <p>If you believe you were blocked by mistake, you can find additional information and instructions in the <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/No_open_proxies" class="extiw" title="m:Special:MyLanguage/No open proxies">No open proxies</a> global policy. Otherwise, to discuss the block please <a href="https://meta.wikimedia.org/wiki/Steward_requests/Global" class="extiw" title="m:Steward requests/Global">post a request for review on Meta-Wiki</a>. 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System administrators can use SystemTap to extract, filter and summarize data in order to enable diagnosis of complex performance or functional problems. SystemTap consists of [[free and open-source software]] and includes contributions from [[Red Hat]], [[IBM]], [[Intel]], [[Hitachi, Ltd|Hitachi]], [[Oracle Corporation|Oracle]], the University of Wisconsin-Madison and other community members.<ref>{{cite web|url=https://lwn.net/Articles/315022/|title=A SystemTap update|publisher=[[LWN.net]]}}</ref> ==History== SystemTap debuted in 2005 in [[Red Hat Enterprise Linux]] 4 Update 2 as a technology preview.<ref>{{cite web|url=http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/release-notes/as-x86/RELEASE-NOTES-U2-x86-en.html|title=Product Documentation for Red Hat Enterprise Linux|publisher=[[Red Hat]]}}</ref> After four years in development, SystemTap 1.0 was released in 2009.<ref>{{cite web|url=http://sourceware.org/ml/systemtap/2009-q3/msg00831.html|title=Josh Stone - SystemTap release 1.0}}</ref> {{As of|2011}}, SystemTap runs fully supported in all Linux distributions including [[Red Hat Enterprise Linux|RHEL / CentOS]] 5<ref>{{cite web|url=http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.2/html/Release_Notes/x86/ar01s03.html|title=Product Documentation|publisher=[[Red Hat]]}}</ref> since update 2, SLES 10,<ref>{{cite web|url=http://support.novell.com/techcenter/psdb/f1856527fefb7f2060aeb6907f319a09.html|title=Optional update for SystemTap|date=10 October 2006|publisher=[[Novell]]}}</ref> Fedora, Debian and Ubuntu. Tracepoints in the [[CPython]] VM and [[JVM]] were added in SystemTap 1.2 in 2009.<ref>{{cite web|url=http://fedoraproject.org/wiki/Features/SystemtapStaticProbes|title=Features/SystemtapStaticProbes - FedoraProject|publisher=Fedoraproject}}</ref> In November 2019, SystemTap 4.2 included [[prometheus (software)|prometheus]] exporter. ==Usage== SystemTap files are written in the SystemTap language<ref>{{Cite web|url=https://sourceware.org/systemtap/langref/|title = SystemTap Language Reference}}</ref> (saved as <code>.stp</code> files) and run with the <code>stap</code> command-line.<ref>Compare {{cite journal | title = SystemTap Language Reference: A guide to the constructs and syntax used in SystemTap scripts | first = Robb | last = Romans | year = 2009 | publisher = Red Hat | page = 4 | quote = SystemTap [...] requires root privileges to actually run the kernel objects it builds using the sudo command, applied to the staprun program.[...] staprun is a part of the SystemTap package, dedicated to module loading and unloading and kernel-touser data transfer. | citeseerx = 10.1.1.172.5186}}</ref> The system carries out a number of analysis passes on the script before allowing it to run. Scripts may be executed with one of three backends selected by the <code>--runtime=</code> option. The default is a [[loadable kernel module]], which has the fullest capability to inspect and manipulate any part of the system, and therefore requires most privilege. Another backend is based on the [[dynamic program analysis]] library DynInst to instrument the user's own user-space programs only, and requires least privilege. The newest backend<ref>{{cite web |url = https://sourceware.org/ml/systemtap/2017-q4/msg00096.htmlq1/msg00097.html |title = systemtap 3.2 release |last1 = Merey |first1 = Aaron |date = 2017-10-18 |access-date = 2017-10-18 |quote = The systemtap team announces release 3.2 [...] early experimental eBPF (extended Berkeley Packet Filter) backend [...] }}{{Dead link|date=March 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> is based on [[eBPF|eBPF byte-code]], is limited to the [[Linux]] kernel interpreter's capabilities, and requires an intermediate level of privilege. In each case, the module is unloaded when the script has finished running. Scripts generally focus on events (such as starting or finishing a script), compiled-in probe points such as Linux "tracepoints", or the execution of functions or statements in the kernel or user-space. Some "guru mode" scripts may also have embedded C, which may run with the <code>-g</code> command-line option. However, use of guru mode is discouraged, and each SystemTap release includes more probe points designed to remove the need for guru-mode scripts. Guru mode is required in order to permit scripts to ''modify'' state in the instrumented software, such as to apply some types of emergency security fixes. As of SystemTap version 1.7, the software implements the new ''stapsys'' group and privilege level.<ref>{{cite web | url = http://sourceware.org/ml/systemtap/2012-q1/msg00097.html | title = systemtap 1.7 release | last1 = Eigler | first1 = Frank Ch. | date = 2012-02-01 | access-date = 2013-03-26 | quote = The systemtap team announces release 1.7 [...] The new group and privilege level "stapsys" has been added [...]}}</ref> ==Simple examples== The following script shows all applications setting [[Transmission Control Protocol|TCP]] [[network socket|socket]] options on the system, what options are being set, and whether the option is set successfully or not. <syntaxhighlight lang="vcl"> # Show sockets setting options # Return enabled or disabled based on value of optval function getstatus(optval) { if ( optval == 1 ) return "enabling" else return "disabling" } probe begin { print ("\nChecking for apps setting socket options\n") } # Set a socket option probe tcp.setsockopt { status = getstatus(user_int($optval)) printf (" App '%s' (PID %d) is %s socket option %s... ", execname(), pid(), status, optstr) } # Check setting the socket option worked probe tcp.setsockopt.return { if ( ret == 0 ) printf ("success") else printf ("failed") printf ("\n") } probe end { print ("\nClosing down\n") } </syntaxhighlight> Many other examples are shipped with SystemTap.<ref>{{cite web|url=https://sourceware.org/systemtap/examples/|title=SystemTap Examples}}</ref> There are also real-world examples of SystemTap use at the War Stories page.<ref>{{cite web|url=https://sourceware.org/systemtap/wiki/WarStories|title=WarStories - Systemtap Wiki}}</ref> ==Importing scripts from other tracing technologies== SystemTap can attach to [[DTrace]] markers when they are compiled into an application using macros from the <code>sys/sdt.h</code> header file. ==See also== {{Portal|Free and open-source software}} * [[Kernel marker]] * [[dprobes|DProbes]] * [[LTTng]] * [[strace]] * [[ProbeVue]] ==References== {{Reflist|30em}} ==External links== * {{Official website|https://sourceware.org/systemtap/}} * [https://sourceware.org/systemtap/wiki/ SystemTap Wiki] * [https://sourceware.org/systemtap/langref/ SystemTap Language Reference] ([https://sourceware.org/systemtap/langref.pdf PDF]) * [http://www.ohloh.net/p/systemtap SystemTap project analysis by Ohloh] * [https://myaut.github.io/dtrace-stap-book Dynamic Tracing with DTrace & SystemTap] * [https://sourceware.org/systemtap/tutorial.pdf ''Systemtap tutorial''] Frank Ch. Eigler * [https://sourceware.org/systemtap//SystemTap_Beginners_Guide.pdf ''SystemTap Beginner's Guide''] Don Domingo, William Cohen * [https://www.kernel.org/doc/ols/2006/ols2006v1-pages-261-268.pdf ''Problem Solving With Systemtap''], [http://www.linuxsymposium.org/ Ottawa Linux Symposium] {{Webarchive|url=https://web.archive.org/web/20080913185728/http://www.linuxsymposium.org/ |date=2008-09-13 }} 2006 * [http://sources.redhat.com/systemtap/wiki/RedHatSummit2007?action=AttachFile&do=get&target=RHSummit07-ETSystemTap.pdf ''Problem Solving with SystemTap''] {{Webarchive|url=https://web.archive.org/web/20120222005620/http://sources.redhat.com/systemtap/wiki/RedHatSummit2007?action=AttachFile&do=get&target=RHSummit07-ETSystemTap.pdf |date=2012-02-22 }}, Eugene Teo, presented at the [http://www.redhat.com/summit/ Red Hat Summit] 2007 ([https://sourceware.org/systemtap/wiki/RedHatSummit2007?action=AttachFile&do=get&target=RHSummit07-ETSystemTapScripts.bz2 scripts]) * [https://sourceware.org/systemtap/wiki/LW2008SystemTapTutorial?action=AttachFile&do=get&target=jistone-systemtap-linuxworld08.pdf ''Dynamic Tracing and Performance Analysis Using SystemTap''], Joshua Stone, presented at the [https://web.archive.org/web/19990117025510/http://linuxworldexpo.com/ LinuxWorld Conference] 2008 * [https://sourceware.org/systemtap/wiki/LPC2008SystemTapTutorial?action=AttachFile&do=get&target=LPC_2008_stap.pdf SystemTap Tutorial], Jim Keniston, presented at the [http://linuxplumbersconf.org/ Linux Plumbers Conference] 2008 {{Linux kernel}} [[Category:Free software programmed in C++]] [[Category:Free system software]] [[Category:Debuggers]] [[Category:Linux kernel features]] [[Category:Linux-only free software]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p><span id="templatesused">Pages transcluded onto the current version of this page<span class="posteditwindowhelplinks"> (<a href="/wiki/Help:Transclusion" 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