On Wed, 18 Jun 2008, Adrian Bunk wrote: > On Wed, Jun 18, 2008 at 10:59:50AM +0100, David Woodhouse wrote: > > On Wed, 2008-06-18 at 10:57 +0200, Geert Uytterhoeven wrote: > > > On Wed, 18 Jun 2008, Adrian Bunk wrote: > > > > You miss the size increase imposed by CONFIG_MODULES=y. > > > > > > > > E.g. setting CONFIG_MODULES=y in the arm collie_defconfig will > > > > increase the size of vmlinux by 14% (sic). > > > > > > > > I haven't investigated why it takes that much space, but stuff like > > > > kernel/module.o taking 23kB and each EXPORT_SYMBOL requiring a few > > > > bytes simply cannot be completely eliminated. > > > > > > Sounds like we need a tool that strips out the unneeded symbols, given a list > > > of modules? > > > > And do the --gc-sections step again after that... :) > > But even after all optimizations CONFIG_MODULES=y will still cause a > significant additional cost [1] when thinking in the dimensions of > Tim's "the 30 or so Linux-tiny patches that I use get me about 110k of > reductions. For me, this is about 5% of my kernel size" statement in > another thread. > > [1] as I said, kernel/module.o alone takes 23kB Which could be freed after the last module has been loaded? With kind regards, Geert Uytterhoeven Software Architect Sony Techsoft Centre The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium Phone: +32 (0)2 700 8453 Fax: +32 (0)2 700 8622 E-mail: Geert.Uytterhoeven@xxxxxxxxxxx Internet: http://www.sony-europe.com/ Sony Technology and Software Centre Europe A division of Sony Service Centre (Europe) N.V. Registered office: Technologielaan 7 · B-1840 Londerzeel · Belgium VAT BE 0413.825.160 · RPR Brussels Fortis 293-0376800-10 GEBA-BE-BB
