scx-upstream/scripts/process_runqlat.bt
Jose Fernandez 7b4689cbde
scripts: whitespace cleanup for process_runqlat.bt
Use tabs instead of spaces for indentation in process_runqlat.bt. I also
updated comments and fixed a typo.

Signed-off-by: Jose Fernandez <josef@netflix.com>
2024-05-15 14:59:13 -06:00

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#!/usr/bin/env bpftrace
/*
* Copyright (c) Jose Fernandez <josef@netflix.com>
*
* process_runqlat.bt - Instrument runqueue latency for a PID and its threads.
*
* This script measures the runqueue latency for a specified process ID (PID)
* and includes all threads spawned by that process.
*
* USAGE: sudo ./process_runqlat.bt <PID>
*
* The program output will include:
* - Stats by task (count, avg latency, total latency)
* - A histogram of all latency measurements
* - Aggregated total stats (count, avg latency, total latency)
*/
#include <linux/sched.h>
BEGIN
{
if ($1 == 0) {
printf("PID is missing, use `sudo ./process_runqlat.bt <pid>`\n");
exit();
}
printf("Instrumenting runqueue latency for PID %d. Hit Ctrl-C to end.\n", $1);
}
/*
* args:
* - struct task_struct *p
*/
rawtracepoint:sched_wakeup,
rawtracepoint:sched_wakeup_new,
{
$task = (struct task_struct *)arg0;
// We filter by tgid to include all threads of the process
if ($task->tgid == $1) {
@qtime[$task->pid] = nsecs;
}
}
/*
* args:
* - bool preempt
* - struct task_struct *prev
* - struct task_struct *next
* - unsigned int prev_state
*/
rawtracepoint:sched_switch
{
$prev = (struct task_struct *)arg1;
$next = (struct task_struct *)arg2;
$prev_state = arg3;
if ($next->tgid != $1) {
return;
}
if ($prev_state == TASK_RUNNING && $prev->tgid == $1) {
@qtime[$prev->pid] = nsecs;
}
$nsec = @qtime[$next->pid];
if ($nsec) {
$usec = (nsecs - $nsec) / 1000;
@usec_total_stats = stats($usec);
@usec_hist = hist($usec);
@tasks[$next->comm, $next->pid] = stats($usec);
}
delete(@qtime[$next->pid]);
}
END
{
clear(@qtime);
}