Messages in this thread | | | From | Mikael Pettersson <> | Date | Fri, 10 Jan 2003 12:19:07 +0100 | Subject | Re: detecting hyperthreading in linux 2.4.19 |
| |
Dave Jones writes: > On Fri, Jan 10, 2003 at 08:05:07AM +0100, Mikael Pettersson wrote: > > > If the kernel has sched_setaffinity() or some other way of binding a process > > to a given CPU (as numbered by the kernel, which may or may not be related > > to any physical CPU numbers), then this will do it: execute CPUID on each > > CPU and check the initial APIC ID field. If you find one that's non-zero, > > then HT is enabled. > > That's a horrible way of reimplementing /dev/cpu/x/cpuid 8-)
True. I forgot about that interface since I personally never configure or use it.
So this answers the original question. Just access /dev/cpu/$CPU/cpuid for all (accessible) values of $CPU. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |