Manual: oomkill.bt

oomkill.bt(8)				   System Manager's Manual			       oomkill.bt(8)

NAME
       oomkill.bt - Trace OOM killer. Uses bpftrace/eBPF.

SYNOPSIS
       oomkill.bt

DESCRIPTION
       This  traces the kernel out-of-memory killer, and prints basic details, including the system load av‐
       erages at the time of the OOM kill. This can provide more context on the system state  at  the  time:
       was  it	getting	 busier	 or steady, based on the load averages? This tool may also be useful to cus‐
       tomize for investigations; for example, by adding other task_struct details at the time of OOM, or by
       adding other commands to run at the shell.

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS
       CONFIG_BPF and bpftrace.

EXAMPLES
       Trace OOM kill events:
	      # oomkill.bt

FIELDS
       Triggered by ...
	      The process ID and process name of the task that was running when another task was OOM killed.

       CGROUP ...
	      If the OOM occurs in the memory cgroup, display the memory cgroup information.

       OOM kill of ...
	      The process ID and name of the target process that was OOM killed.

       loadavg
	      Contents of /proc/loadavg. The first three numbers are 1,	 5,  and  15  minute  load  averages
	      (where  the  average is an exponentially damped moving sum, and those numbers are constants in
	      the equation); then there is the number of running tasks, a slash, and  the  total  number  of
	      tasks; and then the last number is the last PID to be created.

OVERHEAD
       Negligible.

SOURCE
       This is from bpftrace.

	      https://github.com/bpftrace/bpftrace

       Also  look  in the bpftrace distribution for a companion _examples.txt file containing example usage,
       output, and commentary for this tool.

       This is a bpftrace version of the bcc tool of the same name. The bcc tool may  provide  more  options
       and customizations.

	      https://github.com/iovisor/bcc

OS
       Linux

STABILITY
       Unstable - in development.

AUTHOR
       Brendan Gregg, Rong Tao

SEE ALSO
       dmesg(1)

USER COMMANDS					 2018-09-07				       oomkill.bt(8)