bpftrace MCP Server

#!/usr/bin/env bpftrace /* * runqlen.bt CPU scheduler run queue length as a histogram. * For Linux, uses bpftrace, eBPF. * * This is a bpftrace version of the bcc tool of the same name. * * Copyright 2018 Netflix, Inc. * Licensed under the Apache License, Version 2.0 (the "License") * * 07-Oct-2018 Brendan Gregg Created this. */ #ifndef BPFTRACE_HAVE_BTF #include <linux/sched.h> // Until BTF is available, we'll need to declare some of this struct manually, // since it isn't available to be #included. This will need maintenance to match // your kernel version. It is from kernel/sched/sched.h: struct cfs_rq { struct load_weight load; unsigned long runnable_weight; unsigned int nr_running; unsigned int h_nr_running; }; #endif BEGIN { printf("Sampling run queue length at 99 Hertz... Hit Ctrl-C to end.\n"); } profile:hz:99 { $task = (struct task_struct *)curtask; $my_q = (struct cfs_rq *)$task->se.cfs_rq; $len = $my_q->nr_running; $len = $len > 0 ? $len - 1 : 0; // subtract currently running task @runqlen = lhist($len, 0, 100, 1); }