* Linus Torvalds <torva...@linux-foundation.org> wrote: > On Thu, Oct 10, 2013 at 12:04 PM, Steven Rostedt <rost...@goodmis.org> wrote: > > > > I'm wondering if we can have a for_each_cpu() that only disables > > preemption in the loop. > > I think we'd generally want to have it be something the loop asks for. > > If the loop is just some kind of "gather statistics" thing, I don't > think it's required. The cost per loop is so low (usually adding up a > couple of words) that the downside drowns the upside. > > And we could easily look at MAXSMP (or NR_CPUS) at compile-time, and not > do it for common small values (although it looks like Fedora defaults to > 128 CPU's for their distro kernels, which seems a bit excessive - too > many by far for normal people, too few for the crazy big ones).
Ubuntu has it at 256, so I guess Fedora is even a bit conservative ;-) Thanks, Ingo -- 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/