On 01/25/2016 06:04 AM, Dan Qing Zhang wrote:
This patch tries to fix cpus_online() for powerpc64 when running fio by using parameter "cpus_allowed", in order to obtain correct max CPU number on powerpc64 architecture. When changing SMT settings on powerpc architecture, the way of cpu numbering is changing as well. For example, when SMT=off, CPUs are numbered like 0,8,16,..., while when SMT=2, CPUs are numbered like 0,1,8,9,.... Therefore, sysconf(_SC_NPROCESSORS_ONLN) is not applied to get exact max CPU number on powerpc. And the max_cpu value can be correctly ontained by using sysconf(_SC_NPROCESSORS_CONF).
Thanks, applied. I have a general dislike for discontiguous CPU numbering, be it in the kernel or in user space :-)
-- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
