On Wed, Dec 18, 2013 at 04:11:58PM +0100, Peter Zijlstra wrote: > On Wed, Dec 18, 2013 at 03:56:12PM +0100, Frederic Weisbecker wrote: > > Because scheduler_ipi() conditionally calls irq_enter() and irq_exit() > > (I wonder if that's a good idea btw, is that here to deal with spurious > > scheduler IPIs of some sort?) > > No its because the traditional scheduler IPI did all the work from the > interrupt return path -- and like the comment in there says, for many of > the IPIs that's still true. > > So going through the architectures and making all scheduler_ipi callers > do irq_enter/exit would actually make them slower.
Fair point! Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/