Messages in this thread | | | Date | Fri, 13 Jul 2007 09:34:02 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: x86: Convert cpu_core_map to be a per cpu variable |
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On Fri, 13 Jul 2007, David Miller wrote:
> From: Christoph Lameter <clameter@sgi.com> > Date: Thu, 12 Jul 2007 23:58:06 -0700 (PDT) > > > 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. > > I'm using NR_CPUS set to 1024 on my sparc64 workstation, it's > not that bad to be honest :-) What kind of cpu arity are you > talking about?
Up to 16k.
> > 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? > > > > Signed-off-by: Christoph Lameter <clameter@sgi.com> > > Please take care of sparc64 if you're going to do this change. > It uses cpu_core_map too.
But the code modified here is x86_64 and i386 specific? Is there an overlap?
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