gsphinx.addnodesdocument)}( rawsourcechildren]( translations LanguagesNode)}(hhh](h pending_xref)}(hhh]docutils.nodesTextChinese (Simplified)}parenthsba attributes}(ids]classes]names]dupnames]backrefs] refdomainstdreftypedoc reftarget0/translations/zh_CN/tools/rtla/rtla-timerlat-topmodnameN classnameN refexplicitutagnamehhh ubh)}(hhh]hChinese (Traditional)}hh2sbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget0/translations/zh_TW/tools/rtla/rtla-timerlat-topmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hItalian}hhFsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget0/translations/it_IT/tools/rtla/rtla-timerlat-topmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hJapanese}hhZsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget0/translations/ja_JP/tools/rtla/rtla-timerlat-topmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hKorean}hhnsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget0/translations/ko_KR/tools/rtla/rtla-timerlat-topmodnameN classnameN refexplicituh1hhh ubh)}(hhh]hSpanish}hhsbah}(h]h ]h"]h$]h&] refdomainh)reftypeh+ reftarget0/translations/sp_SP/tools/rtla/rtla-timerlat-topmodnameN classnameN refexplicituh1hhh ubeh}(h]h ]h"]h$]h&]current_languageEnglishuh1h hh _documenthsourceNlineNubhsection)}(hhh](htitle)}(hrtla-timerlat-toph]hrtla-timerlat-top}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhJ/var/lib/git/docbuild/linux/Documentation/tools/rtla/rtla-timerlat-top.rsthKubh)}(hhh](h)}(h+Measures the operating system timer latencyh]h+Measures the operating system timer latency}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh field_list)}(hhh]hfield)}(hhh](h field_name)}(hManual sectionh]hManual section}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhhhKubh field_body)}(h1 h]h paragraph)}(h1h]h1}(hhhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhKhhubah}(h]h ]h"]h$]h&]uh1hhhubeh}(h]h ]h"]h$]h&]uh1hhhhKhhhhubah}(h]h ]h"]h$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hSYNOPSISh]hSYNOPSIS}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hhhhhK ubh)}(h%**rtla timerlat top** [*OPTIONS*] ...h](hstrong)}(h**rtla timerlat top**h]hrtla timerlat top}(hj!hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh [}(hjhhhNhNubhemphasis)}(h *OPTIONS*h]hOPTIONS}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh] ...}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK hj hhubeh}(h]synopsisah ]h"]synopsisah$]h&]uh1hhhhhhhhK ubh)}(hhh](h)}(h DESCRIPTIONh]h DESCRIPTION}(hjXhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjUhhhhhKubh)}(hXBThe **rtla timerlat** tool is an interface for the *timerlat* tracer. The *timerlat* tracer dispatches a kernel thread per-cpu. These threads set a periodic timer to wake themselves up and go back to sleep. After the wakeup, they collect and generate useful information for the debugging of operating system timer latency.h](hThe }(hjfhhhNhNubj )}(h**rtla timerlat**h]h rtla timerlat}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjfubh tool is an interface for the }(hjfhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjfubh tracer. The }(hjfhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjfubh tracer dispatches a kernel thread per-cpu. These threads set a periodic timer to wake themselves up and go back to sleep. After the wakeup, they collect and generate useful information for the debugging of operating system timer latency.}(hjfhhhNhNubeh}(h]h ]h"]h$]h&]uh1hh8Documentation/tools/rtla/common_timerlat_description.rsthKhjUhhubh)}(hThe *timerlat* tracer outputs information in two ways. It periodically prints the timer latency at the timer *IRQ* handler and the *Thread* handler. It also enables the trace of the most relevant information via **osnoise:** tracepoints.h](hThe }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh_ tracer outputs information in two ways. It periodically prints the timer latency at the timer }(hjhhhNhNubj4)}(h*IRQ*h]hIRQ}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh handler and the }(hjhhhNhNubj4)}(h*Thread*h]hThread}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubhI handler. It also enables the trace of the most relevant information via }(hjhhhNhNubj )}(h **osnoise:**h]hosnoise:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh tracepoints.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjUhhubh)}(hXThe **rtla timerlat** tool sets the options of the *timerlat* tracer and collects and displays a summary of the results. By default, the collection is done synchronously in kernel space using a dedicated BPF program attached to the *timerlat* tracer. If either BPF or the **osnoise:timerlat_sample** tracepoint it attaches to is unavailable, the **rtla timerlat** tool falls back to using tracefs to process the data asynchronously in user space.h](hThe }(hjhhhNhNubj )}(h**rtla timerlat**h]h rtla timerlat}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh tool sets the options of the }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh tracer and collects and displays a summary of the results. By default, the collection is done synchronously in kernel space using a dedicated BPF program attached to the }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh tracer. If either BPF or the }(hjhhhNhNubj )}(h**osnoise:timerlat_sample**h]hosnoise:timerlat_sample}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh/ tracepoint it attaches to is unavailable, the }(hjhhhNhNubj )}(h**rtla timerlat**h]h rtla timerlat}(hjQhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhS tool falls back to using tracefs to process the data asynchronously in user space.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhK hjUhhubh)}(hThe **rtla timerlat top** displays a summary of the periodic output from the *timerlat* tracer. It also provides information for each operating system noise via the **osnoise:** tracepoints that can be seem with the option **-T**.h](hThe }(hjihhhNhNubj )}(h**rtla timerlat top**h]hrtla timerlat top}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjiubh4 displays a summary of the periodic output from the }(hjihhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjiubhN tracer. It also provides information for each operating system noise via the }(hjihhhNhNubj )}(h **osnoise:**h]hosnoise:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjiubh. tracepoints that can be seem with the option }(hjihhhNhNubj )}(h**-T**h]h-T}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjiubh.}(hjihhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhjUhhubeh}(h] descriptionah ]h"] descriptionah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hOPTIONSh]hOPTIONS}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKubh)}(h**-a**, **--auto** *us*h](j )}(h**-a**h]h-a}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h **--auto**h]h--auto}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1hh4Documentation/tools/rtla/common_timerlat_options.rsthKhjhhubh block_quote)}(hXSet the automatic trace mode. This mode sets some commonly used options while debugging the system. It is equivalent to use **-T** *us* **-s** *us* **-t**. By default, *timerlat* tracer uses FIFO:95 for *timerlat* threads, thus equilavent to **-P** *f:95*. h]h)}(hXSet the automatic trace mode. This mode sets some commonly used options while debugging the system. It is equivalent to use **-T** *us* **-s** *us* **-t**. By default, *timerlat* tracer uses FIFO:95 for *timerlat* threads, thus equilavent to **-P** *f:95*.h](h|Set the automatic trace mode. This mode sets some commonly used options while debugging the system. It is equivalent to use }(hjhhhNhNubj )}(h**-T**h]h-T}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh }hjsbj )}(h**-s**h]h-s}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }hjsbj4)}(h*us*h]hus}(hjYhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh }(hjhhhNhNubj )}(h**-t**h]h-t}(hjkhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh. By default, }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hj}hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh tracer uses FIFO:95 for }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh threads, thus equilavent to }(hjhhhNhNubj )}(h**-P**h]h-P}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }hjsbj4)}(h*f:95*h]hf:95}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjubah}(h]h ]h"]h$]h&]uh1jhjhKhjhhubh)}(h**-p**, **--period** *us*h](j )}(h**-p**h]h-p}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h **--period**h]h--period}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1hhjhKhjhhubj)}(h2Set the *timerlat* tracer period in microseconds. h]h)}(h1Set the *timerlat* tracer period in microseconds.h](hSet the }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh tracer period in microseconds.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhK hj ubah}(h]h ]h"]h$]h&]uh1jhjhK hjhhubh)}(h**-i**, **--irq** *us*h](j )}(h**-i**h]h-i}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj7ubh, }(hj7hhhNhNubj )}(h **--irq**h]h--irq}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj7ubh }(hj7hhhNhNubj4)}(h*us*h]hus}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj7ubeh}(h]h ]h"]h$]h&]uh1hhjhK hjhhubj)}(hCStop trace if the *IRQ* latency is higher than the argument in us. h]h)}(hBStop trace if the *IRQ* latency is higher than the argument in us.h](hStop trace if the }(hjwhhhNhNubj4)}(h*IRQ*h]hIRQ}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjwubh+ latency is higher than the argument in us.}(hjwhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjsubah}(h]h ]h"]h$]h&]uh1jhjhKhjhhubh)}(h**-T**, **--thread** *us*h](j )}(h**-T**h]h-T}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h **--thread**h]h--thread}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1hhjhKhjhhubj)}(hFStop trace if the *Thread* latency is higher than the argument in us. h]h)}(hEStop trace if the *Thread* latency is higher than the argument in us.h](hStop trace if the }(hjhhhNhNubj4)}(h*Thread*h]hThread}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh+ latency is higher than the argument in us.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjubah}(h]h ]h"]h$]h&]uh1jhjhKhjhhubh)}(h**-s**, **--stack** *us*h](j )}(h**-s**h]h-s}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h **--stack**h]h--stack}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hj+hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1hhjhKhjhhubj)}(h[Save the stack trace at the *IRQ* if a *Thread* latency is higher than the argument in us. h]h)}(hZSave the stack trace at the *IRQ* if a *Thread* latency is higher than the argument in us.h](hSave the stack trace at the }(hjChhhNhNubj4)}(h*IRQ*h]hIRQ}(hjKhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjCubh if a }(hjChhhNhNubj4)}(h*Thread*h]hThread}(hj]hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjCubh+ latency is higher than the argument in us.}(hjChhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhj?ubah}(h]h ]h"]h$]h&]uh1jhjhKhjhhubh)}(h**-t**, **--trace** \[*file*]h](j )}(h**-t**h]h-t}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj{ubh, }(hj{hhhNhNubj )}(h **--trace**h]h--trace}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj{ubh [}(hj{hhhNhNubj4)}(h*file*h]hfile}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj{ubh]}(hj{hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjhhubj)}(h7Save the stopped trace to [*file|timerlat_trace.txt*]. h]h)}(h6Save the stopped trace to [*file|timerlat_trace.txt*].h](hSave the stopped trace to [}(hjhhhNhNubj4)}(h*file|timerlat_trace.txt*h]hfile|timerlat_trace.txt}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh].}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjubah}(h]h ]h"]h$]h&]uh1jhjhKhjhhubhdefinition_list)}(hhh](hdefinition_list_item)}(h**--dma-latency** *us* Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies. *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have similar results. h](hterm)}(h**--dma-latency** *us*h](j )}(h**--dma-latency**h]h --dma-latency}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1jhjhK hjubh definition)}(hhh]h)}(hSet the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies. *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have similar results.h](h Set the /dev/cpu_dma_latency to }(hj!hhhNhNubj4)}(h*us*h]hus}(hj)hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj!ubh,, aiming to bound exit from idle latencies. }(hj!hhhNhNubj4)}(h *cyclictest*h]h cyclictest}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj!ubh sets this value to }(hj!hhhNhNubj4)}(h*0*h]h0}(hjMhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj!ubh by default, use }(hj!hhhNhNubj )}(h**--dma-latency**h]h --dma-latency}(hj_hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj!ubh }(hj!hhhNhNubj4)}(h*0*h]h0}(hjqhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj!ubh to have similar results.}(hj!hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjhK hjubj)}(hXR**--deepest-idle-state** *n* Disable idle states higher than *n* for cpus that are running timerlat threads to reduce exit from idle latencies. If *n* is -1, all idle states are disabled. On exit from timerlat, the idle state setting is restored to its original state before running timerlat. Requires rtla to be built with libcpupower. h](j)}(h**--deepest-idle-state** *n*h](j )}(h**--deepest-idle-state**h]h--deepest-idle-state}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*n*h]hn}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1jhjhK(hjubj)}(hhh](h)}(hXDisable idle states higher than *n* for cpus that are running timerlat threads to reduce exit from idle latencies. If *n* is -1, all idle states are disabled. On exit from timerlat, the idle state setting is restored to its original state before running timerlat.h](h Disable idle states higher than }(hjhhhNhNubj4)}(h*n*h]hn}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubhS for cpus that are running timerlat threads to reduce exit from idle latencies. If }(hjhhhNhNubj4)}(h*n*h]hn}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh is -1, all idle states are disabled. On exit from timerlat, the idle state setting is restored to its original state before running timerlat.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhK#hjubh)}(h+Requires rtla to be built with libcpupower.h]h+Requires rtla to be built with libcpupower.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhK(hjubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhjhK(hjhhubeh}(h]h ]h"]h$]h&]uh1jhjhhhjhNubh)}(h**-k**, **--kernel-threads**h](j )}(h**-k**h]h-k}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h**--kernel-threads**h]h--kernel-threads}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1hhjhK*hjhhubj)}(h:Use timerlat kernel-space threads, in contrast of **-u**. h]h)}(h9Use timerlat kernel-space threads, in contrast of **-u**.h](h2Use timerlat kernel-space threads, in contrast of }(hjFhhhNhNubj )}(h**-u**h]h-u}(hjNhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjFubh.}(hjFhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhK,hjBubah}(h]h ]h"]h$]h&]uh1jhjhK,hjhhubh)}(h**-u**, **--user-threads**h](j )}(h**-u**h]h-u}(hjphhhNhNubah}(h]h ]h"]h$]h&]uh1jhjlubh, }(hjlhhhNhNubj )}(h**--user-threads**h]h--user-threads}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjlubeh}(h]h ]h"]h$]h&]uh1hhjhK.hjhhubj)}(hX;Set timerlat to run without a workload, and then dispatches user-space workloads to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again adding so the measurement for the kernel-to-user and user-to-kernel to the tracer output. **--user-threads** will be used unless the user specify **-k**. h]h)}(hX:Set timerlat to run without a workload, and then dispatches user-space workloads to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again adding so the measurement for the kernel-to-user and user-to-kernel to the tracer output. **--user-threads** will be used unless the user specify **-k**.h](hSet timerlat to run without a workload, and then dispatches user-space workloads to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again adding so the measurement for the kernel-to-user and user-to-kernel to the tracer output. }(hjhhhNhNubj )}(h**--user-threads**h]h--user-threads}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh& will be used unless the user specify }(hjhhhNhNubj )}(h**-k**h]h-k}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhK0hjubah}(h]h ]h"]h$]h&]uh1jhjhK0hjhhubh)}(h**-U**, **--user-load**h](j )}(h**-U**h]h-U}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h**--user-load**h]h --user-load}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1hhjhK5hjhhubj)}(hSet timerlat to run without workload, waiting for the user to dispatch a per-cpu task that waits for a new period on the tracing/osnoise/per_cpu/cpu$ID/timerlat_fd. See linux/tools/rtla/sample/timerlat_load.py for an example of user-load code. h]h)}(hSet timerlat to run without workload, waiting for the user to dispatch a per-cpu task that waits for a new period on the tracing/osnoise/per_cpu/cpu$ID/timerlat_fd. See linux/tools/rtla/sample/timerlat_load.py for an example of user-load code.h]hSet timerlat to run without workload, waiting for the user to dispatch a per-cpu task that waits for a new period on the tracing/osnoise/per_cpu/cpu$ID/timerlat_fd. See linux/tools/rtla/sample/timerlat_load.py for an example of user-load code.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhK7hjubah}(h]h ]h"]h$]h&]uh1jhjhK7hjhhubh)}(h**--on-threshold** *action*h](j )}(h**--on-threshold**h]h--on-threshold}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*action*h]haction}(hj*hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1hhjhK;hjhhubj)}(hXDefines an action to be executed when tracing is stopped on a latency threshold specified by **-i/--irq** or **-T/--thread**. Multiple --on-threshold actions may be specified, and they will be executed in the order they are provided. If any action fails, subsequent actions in the list will not be executed. Supported actions are: - *trace[,file=]* Saves trace output, optionally taking a filename. Alternative to -t/--trace. Note that nlike -t/--trace, specifying this multiple times will result in the trace being saved multiple times. - *signal,num=,pid=* Sends signal to process. "parent" might be specified in place of pid to target the parent process of rtla. - *shell,command=* Execute shell command. - *continue* Continue tracing after actions are executed instead of stopping. Example: $ rtla timerlat -T 20 --on-threshold trace --on-threshold shell,command="grep ipi_send timerlat_trace.txt" --on-threshold signal,num=2,pid=parent This will save a trace with the default filename "timerlat_trace.txt", print its lines that contain the text "ipi_send" on standard output, and send signal 2 (SIGINT) to the parent process. Performance Considerations: For time-sensitive actions, it is recommended to run **rtla timerlat** with BPF support and RT priority. Note that due to implementational limitations, actions might be delayed up to one second after tracing is stopped if BPF mode is not available or disabled. h](h)}(h}Defines an action to be executed when tracing is stopped on a latency threshold specified by **-i/--irq** or **-T/--thread**.h](h]Defines an action to be executed when tracing is stopped on a latency threshold specified by }(hjBhhhNhNubj )}(h **-i/--irq**h]h-i/--irq}(hjJhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjBubh or }(hjBhhhNhNubj )}(h**-T/--thread**h]h -T/--thread}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjBubh.}(hjBhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhK=hj>ubh)}(hMultiple --on-threshold actions may be specified, and they will be executed in the order they are provided. If any action fails, subsequent actions in the list will not be executed.h]hMultiple --on-threshold actions may be specified, and they will be executed in the order they are provided. If any action fails, subsequent actions in the list will not be executed.}(hjthhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhK@hj>ubh)}(hSupported actions are:h]hSupported actions are:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKDhj>ubh bullet_list)}(hhh](h list_item)}(h*trace[,file=]* Saves trace output, optionally taking a filename. Alternative to -t/--trace. Note that nlike -t/--trace, specifying this multiple times will result in the trace being saved multiple times. h](h)}(h*trace[,file=]*h]j4)}(hjh]htrace[,file=]}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubah}(h]h ]h"]h$]h&]uh1hhjhKFhjubh)}(hSaves trace output, optionally taking a filename. Alternative to -t/--trace. Note that nlike -t/--trace, specifying this multiple times will result in the trace being saved multiple times.h]hSaves trace output, optionally taking a filename. Alternative to -t/--trace. Note that nlike -t/--trace, specifying this multiple times will result in the trace being saved multiple times.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKHhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(h*signal,num=,pid=* Sends signal to process. "parent" might be specified in place of pid to target the parent process of rtla. h](h)}(h*signal,num=,pid=*h]j4)}(hjh]hsignal,num=,pid=}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubah}(h]h ]h"]h$]h&]uh1hhjhKLhjubh)}(hjSends signal to process. "parent" might be specified in place of pid to target the parent process of rtla.h]hnSends signal to process. “parent” might be specified in place of pid to target the parent process of rtla.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKNhjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(h2*shell,command=* Execute shell command. h](h)}(h*shell,command=*h]j4)}(hjh]hshell,command=}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubah}(h]h ]h"]h$]h&]uh1hhjhKQhjubh)}(hExecute shell command.h]hExecute shell command.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKShjubeh}(h]h ]h"]h$]h&]uh1jhjubj)}(hM*continue* Continue tracing after actions are executed instead of stopping. h](h)}(h *continue*h]j4)}(hj* h]hcontinue}(hj, hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj( ubah}(h]h ]h"]h$]h&]uh1hhjhKUhj$ ubh)}(h@Continue tracing after actions are executed instead of stopping.h]h@Continue tracing after actions are executed instead of stopping.}(hj? hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKWhj$ ubeh}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]bullet-uh1jhjhKFhj>ubh)}(hExample:h]hExample:}(hj[ hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKYhj>ubh)}(h$ rtla timerlat -T 20 --on-threshold trace --on-threshold shell,command="grep ipi_send timerlat_trace.txt" --on-threshold signal,num=2,pid=parenth]h$ rtla timerlat -T 20 --on-threshold trace --on-threshold shell,command=”grep ipi_send timerlat_trace.txt” --on-threshold signal,num=2,pid=parent}(hji hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhK[hj>ubh)}(hThis will save a trace with the default filename "timerlat_trace.txt", print its lines that contain the text "ipi_send" on standard output, and send signal 2 (SIGINT) to the parent process.h]hThis will save a trace with the default filename “timerlat_trace.txt”, print its lines that contain the text “ipi_send” on standard output, and send signal 2 (SIGINT) to the parent process.}(hjw hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhK_hj>ubh)}(hPerformance Considerations:h]hPerformance Considerations:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKchj>ubh)}(hXFor time-sensitive actions, it is recommended to run **rtla timerlat** with BPF support and RT priority. Note that due to implementational limitations, actions might be delayed up to one second after tracing is stopped if BPF mode is not available or disabled.h](h5For time-sensitive actions, it is recommended to run }(hj hhhNhNubj )}(h**rtla timerlat**h]h rtla timerlat}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh with BPF support and RT priority. Note that due to implementational limitations, actions might be delayed up to one second after tracing is stopped if BPF mode is not available or disabled.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKehj>ubeh}(h]h ]h"]h$]h&]uh1jhjhK=hjhhubh)}(h**--on-end** *action*h](j )}(h **--on-end**h]h--on-end}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h*action*h]haction}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubeh}(h]h ]h"]h$]h&]uh1hhjhKjhjhhubj)}(hXDefines an action to be executed at the end of **rtla timerlat** tracing. Multiple --on-end actions can be specified, and they will be executed in the order they are provided. If any action fails, subsequent actions in the list will not be executed. See the documentation for **--on-threshold** for the list of supported actions, with the exception that *continue* has no effect. Example: $ rtla timerlat -d 5s --on-end trace This runs rtla timerlat with default options and save trace output at the end. h](h)}(hIDefines an action to be executed at the end of **rtla timerlat** tracing.h](h/Defines an action to be executed at the end of }(hj hhhNhNubj )}(h**rtla timerlat**h]h rtla timerlat}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh tracing.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKlhj ubh)}(hMultiple --on-end actions can be specified, and they will be executed in the order they are provided. If any action fails, subsequent actions in the list will not be executed.h]hMultiple --on-end actions can be specified, and they will be executed in the order they are provided. If any action fails, subsequent actions in the list will not be executed.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKnhj ubh)}(hSee the documentation for **--on-threshold** for the list of supported actions, with the exception that *continue* has no effect.h](hSee the documentation for }(hj hhhNhNubj )}(h**--on-threshold**h]h--on-threshold}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh< for the list of supported actions, with the exception that }(hj hhhNhNubj4)}(h *continue*h]hcontinue}(hj/ hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubh has no effect.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKrhj ubh)}(hExample:h]hExample:}(hjG hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKuhj ubh)}(h$$ rtla timerlat -d 5s --on-end traceh]h$$ rtla timerlat -d 5s --on-end trace}(hjU hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKwhj ubh)}(hNThis runs rtla timerlat with default options and save trace output at the end.h]hNThis runs rtla timerlat with default options and save trace output at the end.}(hjc hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhKyhj ubeh}(h]h ]h"]h$]h&]uh1jhjhKlhjhhubh)}(h**-q**, **--quiet**h](j )}(h**-q**h]h-q}(hj{ hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjw ubh, }(hjw hhhNhNubj )}(h **--quiet**h]h--quiet}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjw ubeh}(h]h ]h"]h$]h&]uh1hh/Documentation/tools/rtla/common_top_options.rsthKhjhhubj)}(h0Print only a summary at the end of the session. h]h)}(h/Print only a summary at the end of the session.h]h/Print only a summary at the end of the session.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hKhj ubah}(h]h ]h"]h$]h&]uh1jhj hKhjhhubh)}(h**-c**, **--cpus** *cpu-list*h](j )}(h**-c**h]h-c}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh, }(hj hhhNhNubj )}(h **--cpus**h]h--cpus}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h *cpu-list*h]hcpu-list}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubeh}(h]h ]h"]h$]h&]uh1hh+Documentation/tools/rtla/common_options.rsthKhjhhubj)}(hBSet the osnoise tracer to run the sample threads in the cpu-list. h]h)}(hASet the osnoise tracer to run the sample threads in the cpu-list.h]hASet the osnoise tracer to run the sample threads in the cpu-list.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hKhj ubah}(h]h ]h"]h$]h&]uh1jhj hKhjhhubh)}(h&**-H**, **--house-keeping** *cpu-list*h](j )}(h**-H**h]h-H}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh, }(hj hhhNhNubj )}(h**--house-keeping**h]h--house-keeping}(hj% hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h *cpu-list*h]hcpu-list}(hj7 hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubeh}(h]h ]h"]h$]h&]uh1hhj hKhjhhubj)}(h5Run rtla control threads only on the given cpu-list. h]h)}(h4Run rtla control threads only on the given cpu-list.h]h4Run rtla control threads only on the given cpu-list.}(hjO hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hKhjK ubah}(h]h ]h"]h$]h&]uh1jhj hKhjhhubh)}(h&**-d**, **--duration** *time[s|m|h|d]*h](j )}(h**-d**h]h-d}(hjg hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjc ubh, }(hjc hhhNhNubj )}(h**--duration**h]h --duration}(hjy hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjc ubh }(hjc hhhNhNubj4)}(h*time[s|m|h|d]*h]h time[s|m|h|d]}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjc ubeh}(h]h ]h"]h$]h&]uh1hhj hK hjhhubj)}(h!Set the duration of the session. h]h)}(h Set the duration of the session.h]h Set the duration of the session.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hK hj ubah}(h]h ]h"]h$]h&]uh1jhj hK hjhhubh)}(h**-D**, **--debug**h](j )}(h**-D**h]h-D}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh, }(hj hhhNhNubj )}(h **--debug**h]h--debug}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubeh}(h]h ]h"]h$]h&]uh1hhj hK hjhhubj)}(hPrint debug info. h]h)}(hPrint debug info.h]hPrint debug info.}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hKhj ubah}(h]h ]h"]h$]h&]uh1jhj hKhjhhubh)}(h**-e**, **--event** *sys:event*h](j )}(h**-e**h]h-e}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh, }(hj hhhNhNubj )}(h **--event**h]h--event}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h *sys:event*h]h sys:event}(hj! hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubeh}(h]h ]h"]h$]h&]uh1hhj hKhjhhubj)}(hEnable an event in the trace (**-t**) session. The argument can be a specific event, e.g., **-e** *sched:sched_switch*, or all events of a system group, e.g., **-e** *sched*. Multiple **-e** are allowed. It is only active when **-t** or **-a** are set. h]h)}(hEnable an event in the trace (**-t**) session. The argument can be a specific event, e.g., **-e** *sched:sched_switch*, or all events of a system group, e.g., **-e** *sched*. Multiple **-e** are allowed. It is only active when **-t** or **-a** are set.h](hEnable an event in the trace (}(hj9 hhhNhNubj )}(h**-t**h]h-t}(hjA hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj9 ubh7) session. The argument can be a specific event, e.g., }(hj9 hhhNhNubj )}(h**-e**h]h-e}(hjS hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj9 ubh }(hj9 hhhNhNubj4)}(h*sched:sched_switch*h]hsched:sched_switch}(hje hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj9 ubh), or all events of a system group, e.g., }(hj9 hhhNhNubj )}(h**-e**h]h-e}(hjw hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj9 ubh }hj9 sbj4)}(h*sched*h]hsched}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj9 ubh . Multiple }(hj9 hhhNhNubj )}(h**-e**h]h-e}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj9 ubh% are allowed. It is only active when }(hj9 hhhNhNubj )}(h**-t**h]h-t}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj9 ubh or }(hj9 hhhNhNubj )}(h**-a**h]h-a}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj9 ubh are set.}(hj9 hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hKhj5 ubah}(h]h ]h"]h$]h&]uh1jhj hKhjhhubh)}(h**--filter** **h](j )}(h **--filter**h]h--filter}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h **h]h}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubeh}(h]h ]h"]h$]h&]uh1hhj hKhjhhubj)}(hFilter the previous **-e** *sys:event* event with **. For further information about event filtering see https://www.kernel.org/doc/html/latest/trace/events.html#event-filtering. h]h)}(hFilter the previous **-e** *sys:event* event with **. For further information about event filtering see https://www.kernel.org/doc/html/latest/trace/events.html#event-filtering.h](hFilter the previous }(hj hhhNhNubj )}(h**-e**h]h-e}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h *sys:event*h]h sys:event}(hj% hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubh event with }(hj hhhNhNubj4)}(h **h]h}(hj7 hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubh4. For further information about event filtering see }(hj hhhNhNubh reference)}(hHhttps://www.kernel.org/doc/html/latest/trace/events.html#event-filteringh]hHhttps://www.kernel.org/doc/html/latest/trace/events.html#event-filtering}(hjK hhhNhNubah}(h]h ]h"]h$]h&]refurijM uh1jI hj ubh.}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hKhj ubah}(h]h ]h"]h$]h&]uh1jhj hKhjhhubj)}(hhh]j)}(hXj**--trigger** ** Enable a trace event trigger to the previous **-e** *sys:event*. If the *hist:* trigger is activated, the output histogram will be automatically saved to a file named *system_event_hist.txt*. For example, the command: rtla -t -e osnoise:irq_noise --trigger="hist:key=desc,duration/1000:sort=desc,duration/1000:vals=hitcount" Will automatically save the content of the histogram associated to *osnoise:irq_noise* event in *osnoise_irq_noise_hist.txt*. For further information about event trigger see https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers. h](j)}(h**--trigger** **h](j )}(h **--trigger**h]h --trigger}(hju hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjq ubh }(hjq hhhNhNubj4)}(h **h]h }(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjq ubeh}(h]h ]h"]h$]h&]uh1jhj hK"hjm ubj)}(hhh](h)}(hEnable a trace event trigger to the previous **-e** *sys:event*. If the *hist:* trigger is activated, the output histogram will be automatically saved to a file named *system_event_hist.txt*. For example, the command:h](h-Enable a trace event trigger to the previous }(hj hhhNhNubj )}(h**-e**h]h-e}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh }(hj hhhNhNubj4)}(h *sys:event*h]h sys:event}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubh . If the }(hj hhhNhNubj4)}(h*hist:*h]hhist:}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubhX trigger is activated, the output histogram will be automatically saved to a file named }(hj hhhNhNubj4)}(h*system_event_hist.txt*h]hsystem_event_hist.txt}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubh. For example, the command:}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hKhj ubh)}(h{rtla -t -e osnoise:irq_noise --trigger="hist:key=desc,duration/1000:sort=desc,duration/1000:vals=hitcount"h]hrtla -t -e osnoise:irq_noise --trigger=”hist:key=desc,duration/1000:sort=desc,duration/1000:vals=hitcount”}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hKhj ubh)}(h}Will automatically save the content of the histogram associated to *osnoise:irq_noise* event in *osnoise_irq_noise_hist.txt*.h](hCWill automatically save the content of the histogram associated to }(hjhhhNhNubj4)}(h*osnoise:irq_noise*h]hosnoise:irq_noise}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh event in }(hjhhhNhNubj4)}(h*osnoise_irq_noise_hist.txt*h]hosnoise_irq_noise_hist.txt}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK hj ubh)}(hxFor further information about event trigger see https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers.h](h0For further information about event trigger see }(hj4hhhNhNubjJ )}(hGhttps://www.kernel.org/doc/html/latest/trace/events.html#event-triggersh]hGhttps://www.kernel.org/doc/html/latest/trace/events.html#event-triggers}(hj<hhhNhNubah}(h]h ]h"]h$]h&]refurij>uh1jI hj4ubh.}(hj4hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK"hj ubeh}(h]h ]h"]h$]h&]uh1jhjm ubeh}(h]h ]h"]h$]h&]uh1jhj hK"hjj ubah}(h]h ]h"]h$]h&]uh1jhjhhhj hNubh)}(h>**-P**, **--priority** *o:prio|r:prio|f:prio|d:runtime:period*h](j )}(h**-P**h]h-P}(hjkhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjgubh, }(hjghhhNhNubj )}(h**--priority**h]h --priority}(hj}hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjgubh }(hjghhhNhNubj4)}(h'*o:prio|r:prio|f:prio|d:runtime:period*h]h%o:prio|r:prio|f:prio|d:runtime:period}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjgubeh}(h]h ]h"]h$]h&]uh1hhj hK$hjhhubj)}(hX@Set scheduling parameters to the osnoise tracer threads, the format to set the priority are: - *o:prio* - use SCHED_OTHER with *prio*; - *r:prio* - use SCHED_RR with *prio*; - *f:prio* - use SCHED_FIFO with *prio*; - *d:runtime[us|ms|s]:period[us|ms|s]* - use SCHED_DEADLINE with *runtime* and *period* in nanoseconds. h](h)}(h\Set scheduling parameters to the osnoise tracer threads, the format to set the priority are:h]h\Set scheduling parameters to the osnoise tracer threads, the format to set the priority are:}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hK&hjubj)}(hhh](j)}(h'*o:prio* - use SCHED_OTHER with *prio*;h]h)}(hjh](j4)}(h*o:prio*h]ho:prio}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh - use SCHED_OTHER with }(hjhhhNhNubj4)}(h*prio*h]hprio}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh;}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK(hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(h$*r:prio* - use SCHED_RR with *prio*;h]h)}(hjh](j4)}(h*r:prio*h]hr:prio}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh - use SCHED_RR with }(hjhhhNhNubj4)}(h*prio*h]hprio}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh;}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK)hjubah}(h]h ]h"]h$]h&]uh1jhjubj)}(h&*f:prio* - use SCHED_FIFO with *prio*;h]h)}(hj(h](j4)}(h*f:prio*h]hf:prio}(hj-hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj*ubh - use SCHED_FIFO with }(hj*hhhNhNubj4)}(h*prio*h]hprio}(hj?hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj*ubh;}(hj*hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK*hj&ubah}(h]h ]h"]h$]h&]uh1jhjubj)}(hf*d:runtime[us|ms|s]:period[us|ms|s]* - use SCHED_DEADLINE with *runtime* and *period* in nanoseconds. h]h)}(he*d:runtime[us|ms|s]:period[us|ms|s]* - use SCHED_DEADLINE with *runtime* and *period* in nanoseconds.h](j4)}(h$*d:runtime[us|ms|s]:period[us|ms|s]*h]h"d:runtime[us|ms|s]:period[us|ms|s]}(hjehhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjaubh - use SCHED_DEADLINE with }(hjahhhNhNubj4)}(h *runtime*h]hruntime}(hjwhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjaubh and }(hjahhhNhNubj4)}(h*period*h]hperiod}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjaubh in nanoseconds.}(hjahhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK+hj]ubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]jY jZ uh1jhj hK(hjubeh}(h]h ]h"]h$]h&]uh1jhj hK&hjhhubh)}(h **-C**, **--cgroup**\[*=cgroup*]h](j )}(h**-C**h]h-C}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh, }(hjhhhNhNubj )}(h **--cgroup**h]h--cgroup}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh[}(hjhhhNhNubj4)}(h *=cgroup*h]h=cgroup}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh]}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK-hjhhubj)}(hSet a *cgroup* to the tracer's threads. If the **-C** option is passed without arguments, the tracer's thread will inherit **rtla**'s *cgroup*. Otherwise, the threads will be placed on the *cgroup* passed to the option. h]h)}(hSet a *cgroup* to the tracer's threads. If the **-C** option is passed without arguments, the tracer's thread will inherit **rtla**'s *cgroup*. Otherwise, the threads will be placed on the *cgroup* passed to the option.h](hSet a }(hjhhhNhNubj4)}(h*cgroup*h]hcgroup}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh# to the tracer’s threads. If the }(hjhhhNhNubj )}(h**-C**h]h-C}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubhH option is passed without arguments, the tracer’s thread will inherit }(hjhhhNhNubj )}(h**rtla**h]hrtla}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh’s }(hjhhhNhNubj4)}(h*cgroup*h]hcgroup}(hj5hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh/. Otherwise, the threads will be placed on the }(hjhhhNhNubj4)}(h*cgroup*h]hcgroup}(hjGhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh passed to the option.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK/hjubah}(h]h ]h"]h$]h&]uh1jhj hK/hjhhubh)}(h**--warm-up** *s*h](j )}(h **--warm-up**h]h --warm-up}(hjihhhNhNubah}(h]h ]h"]h$]h&]uh1jhjeubh }(hjehhhNhNubj4)}(h*s*h]hs}(hj{hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjeubeh}(h]h ]h"]h$]h&]uh1hhj hK1hjhhubj)}(hAfter starting the workload, let it run for *s* seconds before starting collecting the data, allowing the system to warm-up. Statistical data generated during warm-up is discarded. h]h)}(hAfter starting the workload, let it run for *s* seconds before starting collecting the data, allowing the system to warm-up. Statistical data generated during warm-up is discarded.h](h,After starting the workload, let it run for }(hjhhhNhNubj4)}(h*s*h]hs}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh seconds before starting collecting the data, allowing the system to warm-up. Statistical data generated during warm-up is discarded.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhj hK3hjubah}(h]h ]h"]h$]h&]uh1jhj hK3hjhhubj)}(hhh]j)}(h]**--trace-buffer-size** *kB* Set the per-cpu trace buffer size in kB for the tracing output. h](j)}(h**--trace-buffer-size** *kB*h](j )}(h**--trace-buffer-size**h]h--trace-buffer-size}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*kB*h]hkB}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1jhj hK6hjubj)}(hhh]h)}(h?Set the per-cpu trace buffer size in kB for the tracing output.h]h?Set the per-cpu trace buffer size in kB for the tracing output.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hK6hjubah}(h]h ]h"]h$]h&]uh1jhjubeh}(h]h ]h"]h$]h&]uh1jhj hK6hjubah}(h]h ]h"]h$]h&]uh1jhjhhhj hNubh)}(h**-h**, **--help**h](j )}(h**-h**h]h-h}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubh, }(hj hhhNhNubj )}(h **--help**h]h--help}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj ubeh}(h]h ]h"]h$]h&]uh1hhj hK8hjhhubj)}(hPrint help menu. h]h)}(hPrint help menu.h]hPrint help menu.}(hj;hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hK:hj7ubah}(h]h ]h"]h$]h&]uh1jhj hK:hjhhubh)}(h**--dump-tasks**h]j )}(hjQh]h --dump-tasks}(hjShhhNhNubah}(h]h ]h"]h$]h&]uh1jhjOubah}(h]h ]h"]h$]h&]uh1hh/Documentation/tools/rtla/common_timerlat_aa.rsthKhjhhubj)}(hUprints the task running on all CPUs if stop conditions are met (depends on !--no-aa) h]h)}(hTprints the task running on all CPUs if stop conditions are met (depends on !--no-aa)h]hTprints the task running on all CPUs if stop conditions are met (depends on !--no-aa)}(hjkhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjfhKhjgubah}(h]h ]h"]h$]h&]uh1jhjfhKhjhhubh)}(h **--no-aa**h]j )}(hjh]h--no-aa}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubah}(h]h ]h"]h$]h&]uh1hhjfhKhjhhubj)}(h8disable auto-analysis, reducing rtla timerlat cpu usage h]h)}(h7disable auto-analysis, reducing rtla timerlat cpu usageh]h7disable auto-analysis, reducing rtla timerlat cpu usage}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjfhKhjubah}(h]h ]h"]h$]h&]uh1jhjfhKhjhhubh)}(h**--aa-only** *us*h](j )}(h **--aa-only**h]h --aa-only}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh }(hjhhhNhNubj4)}(h*us*h]hus}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubeh}(h]h ]h"]h$]h&]uh1hhhhK#hjhhubj)}(hXSet stop tracing conditions and run without collecting and displaying statistics. Print the auto-analysis if the system hits the stop tracing condition. This option is useful to reduce rtla timerlat CPU, enabling the debug without the overhead of collecting the statistics. h]h)}(hXSet stop tracing conditions and run without collecting and displaying statistics. Print the auto-analysis if the system hits the stop tracing condition. This option is useful to reduce rtla timerlat CPU, enabling the debug without the overhead of collecting the statistics.h]hXSet stop tracing conditions and run without collecting and displaying statistics. Print the auto-analysis if the system hits the stop tracing condition. This option is useful to reduce rtla timerlat CPU, enabling the debug without the overhead of collecting the statistics.}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhhhK%hjubah}(h]h ]h"]h$]h&]uh1jhhhK%hjhhubeh}(h]optionsah ]h"]optionsah$]h&]uh1hhhhhhhhKubh)}(hhh](h)}(hEXAMPLEh]hEXAMPLE}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK+ubh)}(hIn the example below, the timerlat tracer is dispatched in cpus *1-23* in the automatic trace mode, instructing the tracer to stop if a *40 us* latency or higher is found::h](h@In the example below, the timerlat tracer is dispatched in cpus }(hj hhhNhNubj4)}(h*1-23*h]h1-23}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubhB in the automatic trace mode, instructing the tracer to stop if a }(hj hhhNhNubj4)}(h*40 us*h]h40 us}(hj#hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hj ubh latency or higher is found:}(hj hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK-hjhhubh literal_block)}(hX# timerlat -a 40 -c 1-23 -q Timer Latency 0 00:00:12 | IRQ Timer Latency (us) | Thread Timer Latency (us) CPU COUNT | cur min avg max | cur min avg max 1 #12322 | 0 0 1 15 | 10 3 9 31 2 #12322 | 3 0 1 12 | 10 3 9 23 3 #12322 | 1 0 1 21 | 8 2 8 34 4 #12322 | 1 0 1 17 | 10 2 11 33 5 #12322 | 0 0 1 12 | 8 3 8 25 6 #12322 | 1 0 1 14 | 16 3 11 35 7 #12322 | 0 0 1 14 | 9 2 8 29 8 #12322 | 1 0 1 22 | 9 3 9 34 9 #12322 | 0 0 1 14 | 8 2 8 24 10 #12322 | 1 0 0 12 | 9 3 8 24 11 #12322 | 0 0 0 15 | 6 2 7 29 12 #12321 | 1 0 0 13 | 5 3 8 23 13 #12319 | 0 0 1 14 | 9 3 9 26 14 #12321 | 1 0 0 13 | 6 2 8 24 15 #12321 | 1 0 1 15 | 12 3 11 27 16 #12318 | 0 0 1 13 | 7 3 10 24 17 #12319 | 0 0 1 13 | 11 3 9 25 18 #12318 | 0 0 0 12 | 8 2 8 20 19 #12319 | 0 0 1 18 | 10 2 9 28 20 #12317 | 0 0 0 20 | 9 3 8 34 21 #12318 | 0 0 0 13 | 8 3 8 28 22 #12319 | 0 0 1 11 | 8 3 10 22 23 #12320 | 28 0 1 28 | 41 3 11 41 rtla timerlat hit stop tracing ## CPU 23 hit stop tracing, analyzing it ## IRQ handler delay: 27.49 us (65.52 %) IRQ latency: 28.13 us Timerlat IRQ duration: 9.59 us (22.85 %) Blocking thread: 3.79 us (9.03 %) objtool:49256 3.79 us Blocking thread stacktrace -> timerlat_irq -> __hrtimer_run_queues -> hrtimer_interrupt -> __sysvec_apic_timer_interrupt -> sysvec_apic_timer_interrupt -> asm_sysvec_apic_timer_interrupt -> _raw_spin_unlock_irqrestore -> cgroup_rstat_flush_locked -> cgroup_rstat_flush_irqsafe -> mem_cgroup_flush_stats -> mem_cgroup_wb_stats -> balance_dirty_pages -> balance_dirty_pages_ratelimited_flags -> btrfs_buffered_write -> btrfs_do_write_iter -> vfs_write -> __x64_sys_pwrite64 -> do_syscall_64 -> entry_SYSCALL_64_after_hwframe ------------------------------------------------------------------------ Thread latency: 41.96 us (100%) The system has exit from idle latency! Max timerlat IRQ latency from idle: 17.48 us in cpu 4 Saving trace to timerlat_trace.txth]hX# timerlat -a 40 -c 1-23 -q Timer Latency 0 00:00:12 | IRQ Timer Latency (us) | Thread Timer Latency (us) CPU COUNT | cur min avg max | cur min avg max 1 #12322 | 0 0 1 15 | 10 3 9 31 2 #12322 | 3 0 1 12 | 10 3 9 23 3 #12322 | 1 0 1 21 | 8 2 8 34 4 #12322 | 1 0 1 17 | 10 2 11 33 5 #12322 | 0 0 1 12 | 8 3 8 25 6 #12322 | 1 0 1 14 | 16 3 11 35 7 #12322 | 0 0 1 14 | 9 2 8 29 8 #12322 | 1 0 1 22 | 9 3 9 34 9 #12322 | 0 0 1 14 | 8 2 8 24 10 #12322 | 1 0 0 12 | 9 3 8 24 11 #12322 | 0 0 0 15 | 6 2 7 29 12 #12321 | 1 0 0 13 | 5 3 8 23 13 #12319 | 0 0 1 14 | 9 3 9 26 14 #12321 | 1 0 0 13 | 6 2 8 24 15 #12321 | 1 0 1 15 | 12 3 11 27 16 #12318 | 0 0 1 13 | 7 3 10 24 17 #12319 | 0 0 1 13 | 11 3 9 25 18 #12318 | 0 0 0 12 | 8 2 8 20 19 #12319 | 0 0 1 18 | 10 2 9 28 20 #12317 | 0 0 0 20 | 9 3 8 34 21 #12318 | 0 0 0 13 | 8 3 8 28 22 #12319 | 0 0 1 11 | 8 3 10 22 23 #12320 | 28 0 1 28 | 41 3 11 41 rtla timerlat hit stop tracing ## CPU 23 hit stop tracing, analyzing it ## IRQ handler delay: 27.49 us (65.52 %) IRQ latency: 28.13 us Timerlat IRQ duration: 9.59 us (22.85 %) Blocking thread: 3.79 us (9.03 %) objtool:49256 3.79 us Blocking thread stacktrace -> timerlat_irq -> __hrtimer_run_queues -> hrtimer_interrupt -> __sysvec_apic_timer_interrupt -> sysvec_apic_timer_interrupt -> asm_sysvec_apic_timer_interrupt -> _raw_spin_unlock_irqrestore -> cgroup_rstat_flush_locked -> cgroup_rstat_flush_irqsafe -> mem_cgroup_flush_stats -> mem_cgroup_wb_stats -> balance_dirty_pages -> balance_dirty_pages_ratelimited_flags -> btrfs_buffered_write -> btrfs_do_write_iter -> vfs_write -> __x64_sys_pwrite64 -> do_syscall_64 -> entry_SYSCALL_64_after_hwframe ------------------------------------------------------------------------ Thread latency: 41.96 us (100%) The system has exit from idle latency! Max timerlat IRQ latency from idle: 17.48 us in cpu 4 Saving trace to timerlat_trace.txt(}hj=sbah}(h]h ]h"]h$]h&] xml:spacepreserveuh1j;hhhK1hjhhubh)}(hXIn this case, the major factor was the delay suffered by the *IRQ handler* that handles **timerlat** wakeup: *65.52%*. This can be caused by the current thread masking interrupts, which can be seen in the blocking thread stacktrace: the current thread (*objtool:49256*) disabled interrupts via *raw spin lock* operations inside mem cgroup, while doing write syscall in a btrfs file system.h](h=In this case, the major factor was the delay suffered by the }(hjMhhhNhNubj4)}(h *IRQ handler*h]h IRQ handler}(hjUhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjMubh that handles }(hjMhhhNhNubj )}(h **timerlat**h]htimerlat}(hjghhhNhNubah}(h]h ]h"]h$]h&]uh1jhjMubh wakeup: }(hjMhhhNhNubj4)}(h*65.52%*h]h65.52%}(hjyhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjMubh. This can be caused by the current thread masking interrupts, which can be seen in the blocking thread stacktrace: the current thread (}(hjMhhhNhNubj4)}(h*objtool:49256*h]h objtool:49256}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjMubh) disabled interrupts via }(hjMhhhNhNubj4)}(h*raw spin lock*h]h raw spin lock}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjMubhP operations inside mem cgroup, while doing write syscall in a btrfs file system.}(hjMhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKnhjhhubh)}(hOThe raw trace is saved in the **timerlat_trace.txt** file for further analysis.h](hThe raw trace is saved in the }(hjhhhNhNubj )}(h**timerlat_trace.txt**h]htimerlat_trace.txt}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh file for further analysis.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKuhjhhubh)}(hXNote that **rtla timerlat** was dispatched without changing *timerlat* tracer threads' priority. That is generally not needed because these threads have priority *FIFO:95* by default, which is a common priority used by real-time kernel developers to analyze scheduling delays.h](h Note that }(hjhhhNhNubj )}(h**rtla timerlat**h]h rtla timerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjubh! was dispatched without changing }(hjhhhNhNubj4)}(h *timerlat*h]htimerlat}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubh^ tracer threads’ priority. That is generally not needed because these threads have priority }(hjhhhNhNubj4)}(h *FIFO:95*h]hFIFO:95}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjubhi by default, which is a common priority used by real-time kernel developers to analyze scheduling delays.}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKwhjhhubh)}(hhh](h)}(hSEE ALSOh]hSEE ALSO}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhK}ubh)}(h1**rtla-timerlat**\(1), **rtla-timerlat-hist**\(1)h](j )}(h**rtla-timerlat**h]h rtla-timerlat}(hj.hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj*ubh(1), }(hj*hhhNhNubj )}(h**rtla-timerlat-hist**h]hrtla-timerlat-hist}(hj@hhhNhNubah}(h]h ]h"]h$]h&]uh1jhj*ubh(1)}(hj*hhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhK~hjhhubh)}(hd*timerlat* tracer documentation: h](j4)}(h *timerlat*h]htimerlat}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1j3hjXubh tracer documentation: <}(hjXhhhNhNubjJ )}(hAhttps://www.kernel.org/doc/html/latest/trace/timerlat-tracer.htmlh]hAhttps://www.kernel.org/doc/html/latest/trace/timerlat-tracer.html}(hjnhhhNhNubah}(h]h ]h"]h$]h&]refurijpuh1jI hjXubh>}(hjXhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhjhhubeh}(h]see-alsoah ]h"]see alsoah$]h&]uh1hhjhhhhhK}ubh)}(hhh](h)}(hAUTHORh]hAUTHOR}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhhhKubh)}(h:Written by Daniel Bristot de Oliveira h](h'Written by Daniel Bristot de Oliveira <}(hjhhhNhNubjJ )}(hbristot@kernel.orgh]hbristot@kernel.org}(hjhhhNhNubah}(h]h ]h"]h$]h&]refurimailto:bristot@kernel.orguh1jI hjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhhhKhjhhubhcomment)}(h SPDX-License-Identifier: GPL-2.0h]h SPDX-License-Identifier: GPL-2.0}hjsbah}(h]h ]h"]h$]h&]jKjLuh1jhjhhh,Documentation/tools/rtla/common_appendix.rsthKubeh}(h]authorah ]h"]authorah$]h&]uh1hhjhhhhhKubeh}(h]exampleah ]h"]exampleah$]h&]uh1hhhhhhhhK+ubh)}(hhh](h)}(h EXIT STATUSh]h EXIT STATUS}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhjhKubj<)}(h0 Passed: the test did not hit the stop tracing condition 1 Error: invalid argument 2 Failed: the test hit the stop tracing conditionh]h0 Passed: the test did not hit the stop tracing condition 1 Error: invalid argument 2 Failed: the test hit the stop tracing condition}hjsbah}(h]h ]h"]h$]h&]jKjLuh1j;hjhKhjhhubeh}(h] exit-statusah ]h"] exit statusah$]h&]uh1hhhhhhjhKubh)}(hhh](h)}(hREPORTING BUGSh]hREPORTING BUGS}(hj hhhNhNubah}(h]h ]h"]h$]h&]uh1hhj hhhjhK ubh)}(hUReport bugs to and h](hReport bugs to <}(hjhhhNhNubjJ )}(hlinux-kernel@vger.kernel.orgh]hlinux-kernel@vger.kernel.org}(hj#hhhNhNubah}(h]h ]h"]h$]h&]refuri#mailto:linux-kernel@vger.kernel.orguh1jI hjubh> and <}(hjhhhNhNubjJ )}(h!linux-trace-devel@vger.kernel.orgh]h!linux-trace-devel@vger.kernel.org}(hj7hhhNhNubah}(h]h ]h"]h$]h&]refuri(mailto:linux-trace-devel@vger.kernel.orguh1jI hjubh>}(hjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhj hhubeh}(h]reporting-bugsah ]h"]reporting bugsah$]h&]uh1hhhhhhjhK ubh)}(hhh](h)}(hLICENSEh]hLICENSE}(hj\hhhNhNubah}(h]h ]h"]h$]h&]uh1hhjYhhhjhKubh)}(h6**rtla** is Free Software licensed under the GNU GPLv2h](j )}(h**rtla**h]hrtla}(hjnhhhNhNubah}(h]h ]h"]h$]h&]uh1jhjjubh. is Free Software licensed under the GNU GPLv2}(hjjhhhNhNubeh}(h]h ]h"]h$]h&]uh1hhjhKhjYhhubeh}(h]licenseah ]h"]licenseah$]h&]uh1hhhhhhjhKubh)}(hhh](h)}(hCOPYINGh]hCOPYING}(hjhhhNhNubah}(h]h ]h"]h$]h&]uh1hhjhhhjhKubh)}(hwCopyright \(C) 2021 Red Hat, Inc. 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