Linux APIC Code Prepares For A Major Overhaul
Written by Michael Larabel in Linux Kernel on 13 August 2014 at 08:51 AM EDT. 5 Comments
The x86 APIC subsystem within the Linux kernel is beginning the process of a major overhaul with the Linux 3.17 kernel.

The Advanced Programmable Interrupt Controller (APIC) support is being overhauled to support physical IOAPIC hot-plugging. Within the Linux 3.17 kernel this feature isn't present but the prepatory work is moving forward after a first attempt at the hot-plug support was rejected on technical grounds. In prepping for the APIC hot-plug support, obsolete driver abstractions were removed and other changes made for this merge window.

Those concerned about the Linux APIC code can find out more about the forthcoming changes via this lengthy mailing list message.

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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter or contacted via

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