Hi! > > Well, this one will be really smaller. And yes, it will make some > > memory non-swappable, but I believe with triggers and infrastructure > > for N900 (and similar) it will be worth it. > > Ah yes thats such a major proportion of platforms I don't know other cellphone hardware in details, but there are 900M Android devices and multi-colored LEDs are quite common. > > Plus, it will actually save CPU cycles, and thus significant power. > > All of which will be totally wiped out if you bump all the millions of > x86 server boxes in the world up by one page of kernel space and cause a > few disk I/Os I don't suggest people enable this on PCs/servers. This is useful for small devices, not for PCs. LED subsystem is not usually used on PCs... > > > little driver but the rest belongs in a library and the library can use > > > accelerators (of any kind) if available, or even things like lightbulbs > > > via X10 so you can have the big red light in the control room flash if > > > the machine dies 8) > > > > Well, I'd prefer my cellphone to signal me "you have a message" by > > flashing blue light, not by dimming lights in the control room ;-). > > Where the cellphone has an offload it makes sense to use it, but in the > general case userspace is much more flexible. You may not want a flashing > big red light and a siren but if its in kernel then nobody can have it, > if it's through a library you can. Well, library is nicer for sending message to the admin over social network of the month, while kernel module is better for Arduino-based USB-connected Turing-complete 3-color led. Unfortunately, collaboration between GNU and Android worlds ends at the kernel-userspace barrier, so we are unlikely to end up with one useful library... [You are right that we could have done something like lpd and have library+daemon in the userspace playing the LED patterns. I just believe that this is easier and better done in kernel.] Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
