Messages in this thread | | | Date | Tue, 17 Jul 2007 12:27:18 -0700 | From | "Siddha, Suresh B" <> | Subject | Re: x86: Convert cpu_core_map to be a per cpu variable |
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On Thu, Jul 12, 2007 at 11:58:06PM -0700, Christoph Lameter wrote: > cpu_core_map is currently an array defined using NR_CPUS. This means that > we overallocate since we will rarely really use the maximum > number of configured cpus. This may become a problem when we need to > increase the NR_CPUs on x86_64 for our new product line. > > If we put the cpu_core_map into the per cpu area then it will be allocated > for each processor as it comes online. > > However, this means that the core map cannot be accessed until the per cpu > area has been allocated. Xen does a weird thing here looping over all > processors and zeroing the masks that are not yet allocated and that will > be zeroed when they are allocated. I commented the code out. Maybe there > is another purpose? Jeremy?
Is there a reason why cpu_sibling_map[] is left out in these changes?
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