Update oomkill.py (iovisor#1945)

* copy oomkill.py to old/oomkill.py

* update oomkill

* Update test_tools_smoke.py

tests/python/test_tools_smoke.py

@@ -240,7 +240,7 @@ def test_offcputime(self):
  def test_offwaketime(self):
  self.run_with_duration("offwaketime.py 1")
 
- @skipUnless(kernel_version_ge(4,4), "requires kernel >= 4.4")
+ @skipUnless(kernel_version_ge(4,9), "requires kernel >= 4.9")
  def test_oomkill(self):
  self.run_with_int("oomkill.py")
 

tools/old/oomkill.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+#
+# oomkill Trace oom_kill_process(). For Linux, uses BCC, 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 OOM.
+#
+# Copyright 2016 Netflix, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+#
+# 09-Feb-2016 Brendan Gregg Created this.
+
+from bcc import BPF
+from time import strftime
+import ctypes as ct
+
+# linux stats
+loadavg = "/proc/loadavg"
+
+# define BPF program
+bpf_text = """
+#include <uapi/linux/ptrace.h>
+#include <linux/oom.h>
+
+struct data_t {
+ u64 fpid;
+ u64 tpid;
+ u64 pages;
+ char fcomm[TASK_COMM_LEN];
+ char tcomm[TASK_COMM_LEN];
+};
+
+BPF_PERF_OUTPUT(events);
+
+void kprobe__oom_kill_process(struct pt_regs *ctx, struct oom_control *oc,
+ struct task_struct *p, unsigned int points, unsigned long totalpages)
+{
+ struct data_t data = {};
+ u32 pid = bpf_get_current_pid_tgid();
+ data.fpid = pid;
+ data.tpid = p->pid;
+ data.pages = totalpages;
+ bpf_get_current_comm(&data.fcomm, sizeof(data.fcomm));
+ bpf_probe_read(&data.tcomm, sizeof(data.tcomm), p->comm);
+ events.perf_submit(ctx, &data, sizeof(data));
+}
+"""
+
+# kernel->user event data: struct data_t
+TASK_COMM_LEN = 16 # linux/sched.h
+class Data(ct.Structure):
+ _fields_ = [
+ ("fpid", ct.c_ulonglong),
+ ("tpid", ct.c_ulonglong),
+ ("pages", ct.c_ulonglong),
+ ("fcomm", ct.c_char * TASK_COMM_LEN),
+ ("tcomm", ct.c_char * TASK_COMM_LEN)
+ ]
+
+# process event
+def print_event(cpu, data, size):
+ event = ct.cast(data, ct.POINTER(Data)).contents
+ with open(loadavg) as stats:
+ avgline = stats.read().rstrip()
+ print(("%s Triggered by PID %d (\"%s\"), OOM kill of PID %d (\"%s\")"
+ ", %d pages, loadavg: %s") % (strftime("%H:%M:%S"), event.fpid,
+ event.fcomm.decode(), event.tpid, event.tcomm.decode(), event.pages,
+ avgline))
+
+# initialize BPF
+b = BPF(text=bpf_text)
+print("Tracing OOM kills... Ctrl-C to stop.")
+b["events"].open_perf_buffer(print_event)
+while 1:
+ b.perf_buffer_poll()

tools/oomkill.py

@@ -36,14 +36,15 @@
 
 BPF_PERF_OUTPUT(events);
 
-void kprobe__oom_kill_process(struct pt_regs *ctx, struct oom_control *oc,
- struct task_struct *p, unsigned int points, unsigned long totalpages)
+void kprobe__oom_kill_process(struct pt_regs *ctx, struct oom_control *oc, const char *message)
 {
+ unsigned long totalpages;
+ struct task_struct *p = oc->chosen;
  struct data_t data = {};
  u32 pid = bpf_get_current_pid_tgid();
  data.fpid = pid;
  data.tpid = p->pid;
- data.pages = totalpages;
+ data.pages = oc->totalpages;
  bpf_get_current_comm(&data.fcomm, sizeof(data.fcomm));
  bpf_probe_read(&data.tcomm, sizeof(data.tcomm), p->comm);
  events.perf_submit(ctx, &data, sizeof(data));