Message-Id: <20080426001548.829332000@polaris-admin.engr.sgi.com>
Date:	Fri, 25 Apr 2008 17:15:48 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 00/11] x86: cleanup early per cpu variables/accesses v5-folded


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


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@....com>
---
v5-folded:
Folded in patches 7 - 11 above.
Fixed some warnings in NONUMA config build.

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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