Messages in this thread | | | From | Roland McGrath <> | Subject | Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug | Date | Wed, 13 Aug 2008 18:26:38 -0700 (PDT) |
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> That said, I wonder how useful it is to do the SMP->UP code transition. > How often does a kernel go from being SMP to UP in a situation where we > really care about the performance? And that won't be shortly be > becoming SMP again anyway?
I agree, it only seems worthwhile to do this substitution when from the config+hardware it's determined at boot that nr_cpus_possible==1 (i.e. no CPU hotplug possibility).
Thanks, Roland
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