1**-c**, **--cpus** *cpu-list* 2 3 Set the |tool| tracer to run the sample threads in the cpu-list. 4 5 By default, the |tool| tracer runs the sample threads on all CPUs. 6 7**-H**, **--house-keeping** *cpu-list* 8 9 Run rtla control threads only on the given cpu-list. 10 11 If omitted, rtla will attempt to auto-migrate its main thread to any CPU that is not running any workload threads. 12 13**-d**, **--duration** *time[s|m|h|d]* 14 15 Set the duration of the session. 16 17**-D**, **--debug** 18 19 Print debug info. 20 21**-e**, **--event** *sys:event* 22 23 Enable 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. 24 25**--filter** *<filter>* 26 27 Filter the previous **-e** *sys:event* event with *<filter>*. For further information about event filtering see https://www.kernel.org/doc/html/latest/trace/events.html#event-filtering. 28 29**--trigger** *<trigger>* 30 Enable a trace event trigger to the previous **-e** *sys:event*. 31 If the *hist:* trigger is activated, the output histogram will be automatically saved to a file named *system_event_hist.txt*. 32 For example, the command: 33 34 rtla <command> <mode> -t -e osnoise:irq_noise --trigger="hist:key=desc,duration/1000:sort=desc,duration/1000:vals=hitcount" 35 36 Will automatically save the content of the histogram associated to *osnoise:irq_noise* event in *osnoise_irq_noise_hist.txt*. 37 38 For further information about event trigger see https://www.kernel.org/doc/html/latest/trace/events.html#event-triggers. 39 40**-P**, **--priority** *o:prio|r:prio|f:prio|d:runtime:period* 41 42 Set scheduling parameters to the |tool| tracer threads, the format to set the priority are: 43 44 - *o:prio* - use SCHED_OTHER with *prio*; 45 - *r:prio* - use SCHED_RR with *prio*; 46 - *f:prio* - use SCHED_FIFO with *prio*; 47 - *d:runtime[us|ms|s]:period[us|ms|s]* - use SCHED_DEADLINE with *runtime* and *period* in nanoseconds. 48 49 If not set, tracer threads keep their default priority. For rtla user threads, it is set to SCHED_FIFO with priority 95. For kernel threads, see *osnoise* and *timerlat* tracer documentation for the running kernel version. 50 51**-C**, **--cgroup**\[*=cgroup*] 52 53 Set 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. 54 55 If not set, the behavior differs between workload types. User workloads created by rtla will inherit rtla's cgroup. Kernel workloads are assigned the root cgroup. 56 57**--warm-up** *s* 58 59 After 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. 60 61**--trace-buffer-size** *kB* 62 Set the per-cpu trace buffer size in kB for the tracing output. 63 64 If not set, the default tracefs buffer size is used. 65 66**--on-threshold** *action* 67 68 Defines an action to be executed when tracing is stopped on a latency threshold 69 specified by |threshold|. 70 71 Multiple --on-threshold actions may be specified, and they will be executed in 72 the order they are provided. If any action fails, subsequent actions in the list 73 will not be executed. 74 75 Supported actions are: 76 77 - *trace[,file=<filename>]* 78 79 Saves trace output, optionally taking a filename. Alternative to -t/--trace. 80 Note that unlike -t/--trace, specifying this multiple times will result in 81 the trace being saved multiple times. 82 83 - *signal,num=<sig>,pid=<pid>* 84 85 Sends signal to process. "parent" might be specified in place of pid to target 86 the parent process of rtla. 87 88 - *shell,command=<command>* 89 90 Execute shell command. 91 92 - *continue* 93 94 Continue tracing after actions are executed instead of stopping. 95 96 Example: 97 98 $ rtla |tool| |thresharg| 20 --on-threshold trace 99 --on-threshold shell,command="grep ipi_send |tracer|\_trace.txt" 100 --on-threshold signal,num=2,pid=parent 101 102 This will save a trace with the default filename "|tracer|\_trace.txt", print its 103 lines that contain the text "ipi_send" on standard output, and send signal 2 104 (SIGINT) to the parent process. 105 106 Performance Considerations: 107 108 |actionsperf| 109 110**--on-end** *action* 111 112 Defines an action to be executed at the end of tracing. 113 114 Multiple --on-end actions can be specified, and they will be executed in the order 115 they are provided. If any action fails, subsequent actions in the list will not be 116 executed. 117 118 See the documentation for **--on-threshold** for the list of supported actions, with 119 the exception that *continue* has no effect. 120 121 Example: 122 123 $ rtla |tool| -d 5s --on-end trace 124 125 This runs rtla with the default options, and saves trace output at the end. 126 127**-h**, **--help** 128 129 Print help menu. 130