On Fri, 25 Mar 2022 19:36:24 +0000
John Keeping <john@xxxxxxxxxxxx> wrote:
> On Wed, Mar 23, 2022 at 10:57:17PM -0400, Steven Rostedt wrote:
> > From: "Steven Rostedt (Google)" <rostedt@xxxxxxxxxxx>
> >
> > Display for each CPU that was traced, the amount of time tasks ran on
> > them. Listing the tasks from the longest runner to the least.
> >
> > Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
> > ---
> > + for (i = 0; i < nr_tasks; i++) {
> > + task = cpu_tasks[i]->task;
> > +
> > + if (!i) {
> > + printf(" Task name PID \t Run time\n");
> > + printf(" --------- --- \t --------\n");
> > + }
> > + printf("%16s %8d\t",
> > + tep_data_comm_from_pid(tep, task->pid),
> > + task->pid);
> > + print_time(cpu_tasks[i]->runtime, '_');
> > + printf(" (%%%lld)\n", (task->runtime * 100) / total_time);
>
> Is there a reason for using the CPU-specific runtime for the value and
> the total runtime for the percentage?
>
> I expected the percentage to be the percentage of this CPU's time spend
> running the task.
We modify it so that each CPU has the same run time, unless there's missed
events at the start (later patches), and then we change total_time to be
the total time of the events on the CPU and not the entire trace.
-- Steve
