On Thu, 23 Dec 2010 14:31:46 +0200 (EET) Aaro Koskinen <aaro.koskinen@xxxxxxxxx> wrote: > > No not yet, will take a look after we're done with this upcoming > > merge window.. > > I also think the idea is good, and this should be maybe posted to wider > audience than just linux-omap. Yes, definitely. As the proof of concept implementation was demonstrating usage on OMAP, I wanted to have some early comments of a few kernel developers before going to a wider audience. > > Yeah I don't know how much non-init data we have for each board-*.c > > file. Maybe there is not much for each machine. > > I took a quick look at omap2plus_defconfig kernel, and non-init text/data > for 29 boards takes 85K. If we would page align those memory consumption > would increase during init to 29*8=232K, but after other boards are > freed we would eventually save 85-8=77K. Thanks for those numbers. 77K is nice, but is not really a huge saving. > Under mach-omap2, another big consumer is clock data which takes also > around 80 K, while e.g. on 2420 only 14 K is needed. My patch 3/6 (which didn't make it to the list, since it was probably too large) already marked some OMAP2 clock data. Unfortunately, I haven't found a nice way of putting strings into a separate sections. For example: static struct foobar __omap2 foo = { .name = "blabla", .id = 12, }; The "struct foobar" goes into the OMAP2-specific section (8 bytes), but the "blabla" string (6 bytes) remains in the global .rodata section, without anyway from removing it. The only solution I see so far would be : static char __omap2 foo_name[] = "blabla"; static struct foobar __omap2 foo = { .name = foo_name, .id = 12, }; but it's really unpleasant. Other ideas ? Regards, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html