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#!/usr/bin/env bpftrace
/*
* oomkill Trace OOM killer.
* For Linux, uses bpftrace and eBPF.
*
* This traces the kernel out-of-memory killer, and prints basic details,
* including the system load averages. This can provide more context on the
* system state at the time of OOM: was it getting busier or steady, based
* on the load averages? This tool may also be useful to customize for
* investigations; for example, by adding other task_struct details at the
* time of the OOM, or other commands in the system() call.
*
* This currently works by using kernel dynamic tracing of oom_kill_process().
*
* USAGE: oomkill.bt
*
* Copyright 2018 Netflix, Inc.
* Licensed under the Apache License, Version 2.0 (the "License")
*
* 07-Sep-2018 Brendan Gregg Created this.
*/
#ifndef BPFTRACE_HAVE_BTF
#include <linux/oom.h>
#endif
BEGIN
{
printf("Tracing oom_kill_process()... Hit Ctrl-C to end.\n");
}
kprobe:oom_kill_process
{
$oc = (struct oom_control *)arg0;
time("%H:%M:%S ");
printf("Triggered by PID %d (\"%s\"), ", pid, comm);
printf("OOM kill of PID %d (\"%s\"), %d pages, loadavg: ",
$oc->chosen->pid, $oc->chosen->comm, $oc->totalpages);
cat("/proc/loadavg");
}