traceshark1

Usage

Overview

traceshark is a graphical viewer for the Ftrace and Perf events that can be captured by the Linux kernel. It visualizes the following events:

cpu_frequency

cpu_idle

sched_migrate_task

sched_process_exit

sched_process_fork

sched_switch

sched_wakeup

sched_wakeup_new

sched_waking

The sched_waking events are not really visualized but there is a button to find the sched_waking event that has instigated a particular sched_wakeup event.

Options

traceshark supports the options that are supported by all Qt applications. For details, check the Qt documentation, especially the documentations of the QApplication class.

Examples

Below is an example of how you can use perf to capture a trace that can be viewed with traceshark:

$ sudo mount -t tmpfs tmpfs /mnt/tmp
$ cd /mnt/tmp
$ sudo perf record -e power:cpu_frequency -e power:cpu_idle -e sched:sched_kthread_stop -e sched:sched_kthread_stop_ret -e sched:sched_migrate_task -e sched:sched_move_numa -e sched:sched_pi_setprio -e sched:sched_process_exec -e sched:sched_process_exit -e sched:sched_process_fork -e sched:sched_process_free -e sched:sched_process_wait -e sched:sched_stick_numa -e sched:sched_swap_numa -e sched:sched_switch -e sched:sched_wait_task -e sched:sched_wake_idle_without_ipi -e sched:sched_wakeup -e sched:sched_wakeup_new -e sched:sched_waking -e cpu-cycles -e cpu-cycles --call-graph=dwarf,20480 -m 512M -r 99 -a
<Control-C>
$ sudo perf script -f > tracefile.asc
$ traceshark tracefile.asc&

It is also possible to use trace-cmd to capture a trace:

$ sudo mount -t tmpfs tmpfs /mnt/tmp
$ cd /mnt/tmp
$ sudo trace-cmd record -e cpu_frequency -e cpu_idle -e sched_kthread_stop -e sched_kthread_stop_ret -e sched_migrate_task -e sched_move_numa -e sched_pi_setprio -e sched_process_exec -e sched_process_exit -e sched_process_fork -e sched_process_free -e sched_process_wait -e sched_stick_numa -e sched_swap_numa -e sched_switch -e sched_wait_task -e sched_wake_idle_without_ipi -e sched_wakeup -e sched_wakeup_new -e sched_waking -b 32768 -r 99
<Control-C>
$ trace-cmd report trace.dat > tracefile.asc
$ traceshark tracefile.asc&