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SubjectRe: [PATCH 00/11] x86: cleanup early per cpu variables/accesses v5-folded

* Mike Travis <travis@sgi.com> wrote:

> 1/11: Increase the limit of NR_CPUS to 4096 and introduce a boolean
> called "MAXSMP" which when set (e.g. "allyesconfig"), will set
> NR_CPUS = 4096 and NODES_SHIFT = 9 (512). Changed max setting
> for NODES_SHIFT from 15 to 9 to accurately reflect the real limit.
>
> 2/11: Introduce a new PER_CPU macro called "EARLY_PER_CPU". This is
> used by some per_cpu variables that are initialized and accessed
> before there are per_cpu areas allocated.
>
> Add a flag "arch_provides_topology_pointers" that indicates pointers
> to topology cpumask_t maps are available. Otherwise, use the function
> returning the cpumask_t value. This is useful if cpumask_t set size
> is very large to avoid copying data on to/off of the stack.
>
> 3/11: Restore the nodenumber field in the x86_64 pda. This field is slightly
> different than the x86_cpu_to_node_map mainly because it's a static
> indication of which node the cpu is on while the cpu to node map is a
> dyanamic mapping that may get reset if the cpu goes offline. This also
> simplifies the numa_node_id() macro.
>
> 4/11: Consolidate node_to_cpumask operations and remove the 256k
> byte node_to_cpumask_map. This is done by allocating the
> node_to_cpumask_map array after the number of possible
> nodes (nr_node_ids) is known.
>
> 5/11: Replace usages of MAX_NUMNODES with nr_node_ids in kernel/sched.c,
> where appropriate. This saves some allocated space as well as many
> wasted cycles going through node entries that are non-existent.
>
> 6/11: Changed some global definitions in drivers/base/cpu.c to static.
>
> 7/11: Remove 544k bytes from the kernel by removing the boot_cpu_pda
> array from the data section and allocating it during startup.
>
> 8/11: Increase performance for systems with large count NR_CPUS by
> limiting the range of the cpumask operators that loop over
> the bits in a cpumask_t variable. This removes a large amount
> of wasted cpu cycles.
>
> 9/11: Change references from for_each_cpu_mask to for_each_cpu_mask_ptr
> in all cases for x86_64 and generic code.
>
> 10/11: Change references from next_cpu to next_cpu_nr (or for_each_cpu_mask_ptr
> if applicable), in all cases for x86_64 and generic code.
>
> 11/11: Pass reference to cpumask variable in net/sunrpc/svc.c

thanks Travis, applied.

Ingo


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