* 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.
* 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.
* 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.
* 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.
* 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.
For inclusion into sched-devel/latest tree.
Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ sched-devel/latest .../mingo/linux-2.6-sched-devel.git
Signed-off-by: Mike Travis <travis@sgi.com>
---
v4-folded:
Folded in Kconfig changes to increase NR_CPU limit to 4096 and add new
config option MAXSMP.
v3-folded:
Folded in follow on "fix" patches to consolidate changes into one place.
Includes change to drivers/base/topology.c to fix s390 build error.
Includes change to fix preemption warning when numa_node_id is used.
checkpatch.pl errors/warnings checked and fixed where possible.
v2: remerged PATCH 2/2 with latest x86.git/latest and sched-devel/latest,
rebuilt and retested 4k-akpm2, 4k-defconfig, nonuma, & nosmp configs.
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