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We will describe in this session a variety of strategies and techniques that were used to optimize the boot up time of the Linux kernel, initramfs, and systemd for Red Hat In Vehicle Operating System. The unreported time before the kernel timer is initialized will be described, and how to measure this on an aarch64 system. Some of the techniques include changes that are specific to the realtime (RT) kernel, such as temporarily tuning RCU on boot up. We’ll also cover how a new project called autoinit was used in the initramfs with systemd to replace udev. Some kernel patch sets that have been merged upstream that help the overall kernel boot speed will also be described.
Brian Masney has been a contributor and user of Linux and open source projects since 1996. He has 25 years of commercial experience, and has worked professionally on large distributed backend systems in userspace, automated large infrastructure in the cloud and data center, and is... Read More →
I joined the Red Hat Automotive Kernel team in 2021 and worked on improving boot time to match the requirement of the Red Hat In Vehicle OS kernel as well as helped enable and support arm64 platforms for it.
