On Wed, May 18, 2011 at 02:10:15PM -0700, Tim Bird wrote: > >>> And why do people overly care for the load time? > >> > >> To reduce overall boot time. > > > > To reduce it even more, build the modules into the kernel :) > > That's what I do most of the time. For some projects, > it is useful to build certain things as modules so you can > defer initializing them until later in the boot sequence. > You can get some critical user-space tasks running, then > come back later to initialize USB and other drivers. > On cameras, it's not uncommon to want to get to user > space in the first 500 milliseconds. That's common even on desktops and servers, and using the bootchart code in the kernel helps find those bottlenecks. > Sony has some code which allows us to both statically link > drivers and defer their initialization, but it's kind of > kludgy and requires modifying the module declarations > for the code you want to defer. Let me know if you think > this is worth doing an RFC about. I don't think that's worth it, there has been talk, and some initial code, about adding kernel modules to the kernel image itself, which would solve a lot of the i/o time of loading modules, and solves some other boot speed problems. That work was done by Jeff Mahoney, but I think he ran into some "interesting" linker issues and had to shelve it due to a lack of time :( thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
