On Fri, Sep 17, 2010 at 03:06:42PM +0200, Peter Zijlstra wrote: > Provide a mechanism that allows running code in IRQ context. It is most > useful for NMI code that needs to interact with the rest of the system > -- like wakeup a task to drain buffers. > > Perf currently has such a mechanism, so extract that and provide it as a > generic feature, independent of perf so that others may also benefit. > > The IRQ context callback is generated through self-IPIs where possible, > or on architectures like powerpc which have soft-disabled IRQs, its ran > on the soft-enable path. Actually these days we do it by setting the decrementer (the built-in timer facility) to generate an interrupt immediately (well, within one timebase tick, i.e. a small number of nanoseconds). Paul. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
