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scripts: Add dsq latency script

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This change adds a bpftrace script to monitor runq latency as well as
dsq latency.

Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
This commit is contained in:
Daniel Hodges 2024-07-19 06:00:12 -07:00
parent c3ce7f154e
commit b6054fb5f2
1 changed files with 60 additions and 0 deletions
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scripts/dsq_lat.bt Executable file
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#!/usr/bin/env bpftrace
// Copyright (c) Meta Platforms, Inc. and affiliates.
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2.
#include <linux/sched.h>
#include <linux/sched/ext.h>
rawtracepoint:sched_wakeup,
rawtracepoint:sched_wakeup_new,
{
$task = (struct task_struct *)arg0;
if ($1 > 0 && $task->tgid != $1) {
return;
}
@qtime[$task->pid] = nsecs;
if ($task->scx.dsq->id >= 0) {
@dsq_time[$task->scx.dsq->id] = nsecs;
}
}
rawtracepoint:sched_switch
{
$prev = (struct task_struct *)arg1;
$next = (struct task_struct *)arg2;
$prev_state = arg3;
if ($1 > 0 && $next->tgid != $1) {
return;
}
if ($prev_state == TASK_RUNNING) {
@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);
@avg_lat = avg($usec);
if ($prev->scx.dsq->id >= 0) {
@dsq_lat[$prev->scx.dsq->id] = avg($usec);
}
}
delete(@qtime[$next->pid]);
}
interval:s:1 {
$scx_ops = kaddr("scx_ops");
$ops = (struct sched_ext_ops*)$scx_ops;
printf("scheduler: %s\n", $ops->name);
print(@avg_lat);
print(@usec_hist);
print(@dsq_lat);
}