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To see the size of the major kernel sections (code, data, and BSS), use the size command, with a wildcard for the first level of sub-directory: Init, user, kernel, mm, fs, ipc, security, crypto, block, ltt, drivers, sound, net, lib The major sub-directories, at the time of this writing (for kernel 2.6.17) are: The major sub-systems of the kernel are put into library object files named built-in.o in the corresponding sub-directory for that sub-system within the kernel build directory. From this information you may be able to predict what the affect of the change will be, and decide whether the change is acceptable. This is useful because as you make changes to the kernel configuration you can determine what part of the kernel is affected by the change.
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HOW TO FIND KERNEL STACK SIZE HOW TO
The following sections describe how to see the size of each kernel sub-system, how to see the size of individual kernel symbols, and how to compare the size of symbols between two kernel versions. The static size of the kernel by sub-system or by kernel symbol. In order to find areas where the kernel size can be reduced, it is often useful to break down Measuring and comparing sub-parts of the kernel To use the size command, run it with the filename of the uncompressed kernel image (which is usually vmlinux).Ģ921377 369712 132996 3424085 343f55 vmlinux However, it can be used as a reasonable estimate. Because of these factors, the size command does not give you an exactly correct value for the static kernel RAM size. Note also that portions of the kernel text and data are set aside in special initialization segments, which are discarded when the kernel finishes booting. Note that the BSS segment is not stored in the kernel image because it can be synthesized at boot time by filling a block of memory with zeros. Use the size command to determine the size of the text, data, and BSS segments of a kernel image. Measuring the kernel text, data and bss segments for example: ' ls -l vmlinuz' or ' ls -l bzImage' (or whatever the compressed image name is for your platform.).The size of this image can be obtained by examining the size of the image file in the host filesystem with the ' ls -l' command: The compressed kernel image is what is stored in the flash or ROM of the target device. Kernel XIP and Data Read In Place Measuring the kernel image size See the following online resources for more information about these techniques: Application-specific RAM can be calculated to be above this minimal amount of required RAM.įor now, this document ignores Execute-In-Place (XIP) and Data-Read-In-Place (DRIP) techniques, the use of which have an impact on the amount of flash and RAM used by the kernel. However, there is a baseline amount of memory which is allocated at system startup. This will fluctuate during system execution.
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the amount of dynamic RAM used by the kernel.However, the data and stack segments may grow according to the needs of the system. The text and BSS segments will stay the same size for the kernel throughout it execution. This includes the text, data, and BSS segments of the kernel at the time it is loaded.the static size of kernel image in RAM (usually, this will be the size of the uncompressed image).
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the size of the kernel image stored in flash (or other persistent storage).There are 3 aspects of kernel size which are important: One big problem area when using Linux in an embedded project is the size of the Linux kernel. 6.2 Appendix B - Configuration Option Details.6.1 Appendix A - Sample minimum configuration for ARM.3.7 Using kernel memory measurement features.3.4 Special Instructions for some kernel options.2.3.3 Comparing kernel symbols between two kernel images.2.3.2 Measuring individual kernel symbols.2.3.1 Measuring major kernel subsystems.2.3 Measuring and comparing sub-parts of the kernel.2.2 Measuring the kernel text, data and bss segments.