"KconfigSize" a Tool to check the Kernal Size (Mr. Ikeda, NEC) [Translator's comment: see presentation PDF file size_tool_celf_2006-01-20_en.pdf (in English)] * Presentation We have analyzed Linux Tiny. The size difference among kernel config's are larger than size reduction by Linux Tiny. So we investigated the relation between config and kernel size. This work was tedious as it required to repeat "make menuconfig, make, ...", so we developed a tool for it. As there is dependence among config's, it was taken into consideration. The goals of this study was to investigate size impact of each config. We classified configs into three categories: 1. mandatory configs required to boot up cpu rootfs device 2. independent configs configs whose sizes are measurable by themselves 3. dependent configs configs whose sizes vary depending on other config settings SMP support, printk support We defined base configs as 1. and 3. above. minimal size: small bzImage, uImage i386: 400k ARM: 340K On ARM, kernel with printk support disabled did not boot Sizes of 2.6 line kernels are getting fatter and fatter * Future Plan Want to make the size predictable from .config file used * Q&A - How do you measure memory usage? Data collectable with /proc/meminfo It would be better to take cache effect into consideration - How about measuring .o size of kernel? Such approach is possible. - How did you resolve dependendence? Investigating by modifying parser of scripts/Kconfig.