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Message-ID: <20070717192718.GF3318@linux-os.sc.intel.com> Date: Tue, 17 Jul 2007 12:27:18 -0700 From: "Siddha, Suresh B" <suresh.b.siddha@...el.com> To: Christoph Lameter <clameter@....com> Cc: ak@...e.de, linux-kernel@...r.kernel.org, travis@....com, Jeremy Fitzhardinge <jeremy@...p.org> Subject: Re: x86: Convert cpu_core_map to be a per cpu variable 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? thanks, suresh - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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