Determining which kernel calls are taking a long time during boot time using initcall_debug

(Doc ID 2071403.1)

Last updated on OCTOBER 29, 2015

Applies to:

Linux OS - Version Oracle Linux 5.11 with Unbreakable Enterprise Kernel [2.6.39] and later
Oracle VM - Version 3.0.1 and later
Linux x86-64


On Oracle Linux, and Oracle VM, it is sometimes complex to determine which portion of the boot sequence takes a long time. There are several different events happening during the boot sequence, and a first troubleshooting step can be done using <Document 2070905.1> but it can be that the data collected using this note isn't sufficient. In that case, the steps described in this note can be used to gather more data about a possible root cause of the slow booting sequence.


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