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Boot time optimization Boot time optimization © Copyright 2004-2021, Bootlin. Creative Commons BY-SA 3.0 license. Latest update: October 2, 2021. Document updates and sources: https://bootlin.com/doc/training/boot-time Corrections, suggestions, contributions and translations are welcome! embedded Linux and kernel engineering Send them to [email protected] - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 1/157 Rights to copy © Copyright 2004-2021, Bootlin License: Creative Commons Attribution - Share Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0/legalcode You are free: I to copy, distribute, display, and perform the work I to make derivative works I to make commercial use of the work Under the following conditions: I Attribution. You must give the original author credit. I Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license identical to this one. I For any reuse or distribution, you must make clear to others the license terms of this work. I Any of these conditions can be waived if you get permission from the copyright holder. Your fair use and other rights are in no way affected by the above. Document sources: https://github.com/bootlin/training-materials/ - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 2/157 Hyperlinks in the document There are many hyperlinks in the document I Regular hyperlinks: https://kernel.org/ I Kernel documentation links: dev-tools/kasan I Links to kernel source files and directories: drivers/input/ include/linux/fb.h I Links to the declarations, definitions and instances of kernel symbols (functions, types, data, structures): platform_get_irq() GFP_KERNEL struct file_operations - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 3/157 Company at a glance I Engineering company created in 2004, named ”Free Electrons” until Feb. 2018. I Locations: Orange, Toulouse, Lyon (France) I Serving customers all around the world I Head count: 13 - Only Free Software enthusiasts! I Focus: Embedded Linux, Linux kernel, build systems and low level Free and Open Source Software for embedded and real-time systems. I Feb. 2021: Bootlin is the 20th all-time Linux kernel contributor I Activities: development, training, consulting, technical support. I Added value: get the best of the user and development community and the resources it offers. Top Linux contributors since git (2005) - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 4/157 Bootlin on-line resources I All our training materials and technical presentations: https://bootlin.com/docs/ I Technical blog: https://bootlin.com/ I Quick news (Mastodon): https://fosstodon.org/@bootlin I Quick news (Twitter): https://twitter.com/bootlincom I Quick news (LinkedIn): Mastodon is a free and decentralized https: social network created in the best //www.linkedin.com/company/bootlin interests of its users. I Elixir - browse Linux kernel sources on-line: Image credits: Jin Nguyen - https://frama.link/bQwcWHTP https://elixir.bootlin.com - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 5/157 Thanks Special thanks to I Zuehlke Engineering (Serbia) I For funding a major update to these materials and further development (2 days now) I Microchip (formerly Atmel Corporation) I For funding the development of the first version of these materials (1 day course) - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 6/157 Practical lab - Lab setup and downloading sources Prepare your lab environment I Download and extract the lab archive Start cloning source trees right away I U-Boot I Linux kernel I Buildroot - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 7/157 Generic course information Generic course information embedded Linux and kernel engineering © Copyright 2004-2021, Bootlin. Creative Commons BY-SA 3.0 license. Corrections, suggestions, contributions and translations are welcome! - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 8/157 Supported hardware BeagleBone Black or BeagleBone Black Wireless, from BeagleBoard.org I Texas Instruments AM335x (ARM Cortex-A8 CPU) I SoC with 3D acceleration, additional processors (PRUs) and lots of peripherals. I 512 MB of RAM I 4 GB of on-board eMMC storage I USB host and USB device, microSD, micro HDMI I WiFi and Bluetooth (wireless version), otherwise Ethernet I 2 x 46 pins headers, with access to many expansion buses (I2C, SPI, UART and more) I A huge number of expansion boards, called capes. See https://elinux.org/Beagleboard:BeagleBone_Capes. - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 9/157 The full system I Beagle Bone Black board (of course). The Wireless variant should work fine too. I Beagle Bone 4.3” LCD cape from Element 14 https://www.element14.com/bbcape43 I Standard USB webcam (supported through the uvcvideo driver). - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 10/157 Practical lab - Board setup Prepare your board I Access the board through its serial line I Check the stock bootloader I Attach the 4.3” LCD cape - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 11/157 Principles Principles embedded Linux and kernel engineering © Copyright 2004-2021, Bootlin. Creative Commons BY-SA 3.0 license. Corrections, suggestions, contributions and translations are welcome! - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 12/157 Set your goals I Reducing boot time implies measuring boot time! I You will have to choose reference events at which you start and stop counting time. I What you choose will depend on the goal you want to achieve. Here are typical cases: I Showing a splash screen or an animation, playing a sound to indicate the board is booting I Starting a listening service to handle a particular message I Being fully functional as fast as possible - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 13/157 Boot time reduction methodology - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 14/157 Boot time components 1st stage Power up ROM code bootloader bootloader sequence (SPL) Linux Root Init Critical kernel filesystem scripts application We are focusing on reducing cold boot time, from power on to the critical application. - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 15/157 Booting on ARM TI OMAP2+ / AM33xx I ROM Code: tries to find a valid bootstrap image from various storage sources, and load it into SRAM. Size limited to <64 KB. No user interaction possible. I X-Loader or U-Boot SPL: runs from SRAM. Initializes the DRAM, the NAND or MMC controller, and loads the secondary bootloader into DRAM and starts it. No user interaction possible. File called MLO (Mmc LOader). I U-Boot: runs from DRAM. Initializes some other hardware devices (network, USB, etc.). Loads the kernel image from storage or network to DRAM and starts it. Shell with commands provided. File called u-boot.bin or u-boot.img. I Linux Kernel: runs from DRAM. Takes over the system completely (bootloaders no longer exists). - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 16/157 What to optimize first Start by optimizing the last steps of the boot process! I Don’t start by optimizing things that will reduce your ability to make measurements and implement other optimizations. I Start by optimizing your applications and startup scripts first. I You can then simplify BusyBox, reducing the number of available commands. I The next thing to do is simplify and optimize the kernel. This will make you lose debugging and development capabilities, but this is fine as user space has already been simplified. I The last thing to do is implement bootloader optimizations, when kernel optimizations are over and when the kernel command line is frozen. We will follow this order during the practical labs. - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 17/157 Worst things first! Premature optimization is the root of all evil. Donald Knuth I Taking the time to measure time carefully is important. I Find the worst consumers of time and address them first. I You can waste a lot of time if you start optimizing minor spots first. - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 18/157 Build automation I Build automation is a very important part of a successful project. I So, through the build system, you should automate any remaining manual step and all the new optimizations that you will implement to reduce boot time. Without such automation, you may forget some optimizations, or introduce new bugs when making further optimizations. I Boot time optimization projects required countless rebuilds too, automating image generation will save a lot of time too. I Kernel and bootloader compiling and optimizations can also be taken care of by the build system, though the need is less critical. - Kernel, drivers and embedded Linux - Development, consulting, training and support - https://bootlin.com 19/157 Generic ideas Some ideas to keep in mind while trying to reduce the boot time: I The fastest code is code that is not executed I A big part of booting is actually loading code and data from the storage to RAM. Reading less means booting faster. I/O are expensive! I The root filesystem may take longer to mount if it is bigger. I So, even code that is not executed can make your boot time longer.
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