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Subject[PATCH 0/2] NR_CPUS: increase maximum NR_CPUS to 4096

* Increases the limit of NR_CPUS to 4096 and introduces a
boolean called "MAXSMP" which when set (e.g. "allyesconfig")
will set NR_CPUS = 4096 and NODES_SHIFT = 9 (512).

I've been running this config (4k NR_CPUS, 512 Max Nodes)
on an AMD box with 2 dual-cores and 4gb memory as well as an
Intel box with 4 single-core cpus and 8Mb. I've also
successfully booted it in a simulated 2cpus/1Gb environment.

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ x86/latest .../x86/linux-2.6-x86.git
+ sched-devel/latest .../mingo/linux-2.6-sched-devel.git

Signed-off-by: Mike Travis <travis@sgi.com>
---

Memory usage effects from upping NR_CPUS to 4096 and MAX_NUMANODES to 512.

255-akpm2: akpm2 config with NR_CPUS=255 / NUMA_NODE_SHIFT=6
4k-akpm2: akpm2 config with NR_CPUS=4096 / NUMA_NODE_SHIFT=9

====== Data (-l 1000)
1 - 255-akpm2
2 - 4k-akpm2

.1. .2. ..final..
1114112 +3899392 5013504 +350% irq_desc(.data.cacheline_aligned)
313344 +4177920 4491264 +1333% irq_cfg(.data.read_mostly)
76800 +537600 614400 +700% early_node_map(.init.data)
32640 +491648 524288 +1506% boot_pageset(.bss)
32640 +491648 524288 +1506% boot_cpu_pda(.data.cacheline_aligned)
23040 +161280 184320 +700% initkmem_list3(.init.data)
5632 +39424 45056 +700% node_devices(.bss)
4096 +28672 32768 +700% plat_node_bdata(.bss)
2656 +34312 36968 +1291% cache_cache(.data)
2048 +14336 16384 +700% rio_devs(.init.data)
2048 +260096 262144 +12700% node_to_cpumask_map(.data.read_mostly)
2040 +30728 32768 +1506% centrino_model(.bss)
2040 +30728 32768 +1506% centrino_cpu(.bss)
2040 +30728 32768 +1506% _cpu_pda(.data.read_mostly)
1024 +1024 2048 +100% pxm_to_node_map(.data)
1024 +7168 8192 +700% nodes_add(.bss)
1024 +7168 8192 +700% nodes(.init.data)
1024 +7168 8192 +700% hugepage_freelists(.bss)
1020 +15364 16384 +1506% x86_cpu_to_node_map_init(.data)
1020 +15364 16384 +1506% cpu_set_freq(.bss)
1020 +15364 16384 +1506% cpu_min_freq(.bss)
1020 +15364 16384 +1506% cpu_max_freq(.bss)
1020 +15364 16384 +1506% cpu_is_managed(.bss)
1020 +15364 16384 +1506% cpu_cur_freq(.bss)
512 +3584 4096 +700% zone_movable_pfn(.init.data)
512 +3584 4096 +700% scal_devs(.init.data)
512 +3584 4096 +700% node_data(.data.read_mostly)
510 +7682 8192 +1506% x86_cpu_to_apicid_init(.init.data)
510 +7682 8192 +1506% x86_bios_cpu_apicid_init(.init.data)
0 +4096 4096 . tvec_base_done(.data)
0 +2048 2048 . surplus_huge_pages_node(.bss)
0 +2048 2048 . nr_huge_pages_node(.bss)
0 +2048 2048 . node_to_pxm_map(.data)
0 +2048 2048 . node_order(.bss)
0 +2048 2048 . node_load(.bss)
0 +2048 2048 . free_huge_pages_node(.bss)
0 +2048 2048 . fake_node_to_pxm_map(.init.data)
0 +1552 1552 . def_root_domain(.bss)

====== Sections (-l 500)
1 - 255-akpm2
2 - 4k-akpm2

.1. .2. ..final..
63092788 +10579589 73672377 +16% Total
41514099 +93823 41607922 <1% .debug_info
6648945 -2268 6646677 <1% .debug_loc
3365341 +7483 3372824 <1% .text
2631073 -1672 2629401 <1% .debug_line
1320219 +31557 1351776 +2% .debug_abbrev
1149568 +4391040 5540608 +381% .data.cacheline_aligned
1106192 -4784 1101408 <1% .debug_ranges
732736 +728832 1461568 +99% .bss
329672 +4474992 4804664 +1357% .data.read_mostly
285576 +100320 385896 +35% .data
173664 +751936 925600 +432% .init.data
40824 +7808 48632 +19% .data.percpu

====== Text/Data ()
1 - 255-akpm2
2 - 4k-akpm2

.1. .2. ..final..
3364864 +8192 3373056 <1% TextSize
1552384 +100352 1652736 +6% DataSize
733184 +729088 1462272 +99% BssSize
393216 +757760 1150976 +192% InitSize
40960 +8192 49152 +20% PerCPU
1529856 +8869888 10399744 +579% OtherSize
7614464 +10473472 18087936 +137% Totals

====== PerCPU ()
1 - 255-akpm2
2 - 4k-akpm2

.1. .2. ..final..
18432 -2048 16384 -11% kstat
10240 -2048 8192 -20% init_tss
2048 -2048 . -100% fdtable_defer_list
0 +2048 2048 . node_domains
0 +2048 2048 . lru_add_active_pvecs
0 +2048 2048 . cpuidle_devices
0 +2048 2048 . cpu_mask
0 +2048 2048 . cpu_info
0 +2048 2048 . cpu_core_map
0 +2048 2048 . core_domains
30720 +8192 38912 +26% Totals

====== Stack (-l 1000)
1 - 255-akpm2
2 - 4k-akpm2

.1. .2. ..final..
0 +4216 4216 . show_schedstat
0 +2744 2744 . build_sched_domains
0 +2152 2152 . centrino_target
0 +1640 1640 . setup_IO_APIC
0 +1592 1592 . move_task_off_dead_cpu
0 +1576 1576 . setup_IO_APIC_irq
0 +1560 1560 . tick_notify
0 +1560 1560 . __assign_irq_vector
0 +1552 1552 . arch_setup_msi_irq
0 +1552 1552 . arch_setup_ht_irq
0 +1544 1544 . tick_do_periodic_broadcast
0 +1544 1544 . irq_affinity_write_proc
0 +1144 1144 . threshold_create_device
0 +1112 1112 . sched_balance_self
0 +1064 1064 . _cpu_down
0 +1056 1056 . __smp_call_function_mask
0 +1048 1048 . store_threshold_limit
0 +1048 1048 . set_ioapic_affinity_irq
0 +1048 1048 . acpi_processor_set_throttling
0 +1048 1048 . acpi_map_lsapic
0 +1040 1040 . store_interrupt_enable
0 +1040 1040 . set_msi_irq_affinity
0 +1040 1040 . set_ht_irq_affinity
0 +1032 1032 . store_error_count
0 +1032 1032 . show_error_count
0 +1032 1032 . setup_ioapic_dest
0 +1032 1032 . sched_setaffinity
0 +1032 1032 . physflat_send_IPI_allbutself
0 +1032 1032 . native_flush_tlb_others
0 +1032 1032 . move_masked_irq
0 +1032 1032 . flat_send_IPI_allbutself
0 +1024 1024 . pci_bus_show_cpuaffinity
0 +1024 1024 . machine_crash_shutdown
0 +1024 1024 . local_cpus_show
0 +1024 1024 . irq_complete_move
0 +1024 1024 . ioapic_retrigger_irq
0 +1024 1024 . fixup_irqs
0 +1024 1024 . create_irq

====== MemInfo ()
1 - 255-akpm2
2 - 4k-akpm2

.1. .2. ..final..
30146560 +786432 30932992 +2% Active
1018880 +64512 1083392 +6% Active(Node.0)
6517760 +132096 6649856 +2% Active(Node.1)
17465344 -12288 17453056 <1% AnonPages
2932736 +69632 3002368 +2% AnonPages(Node.0)
14532608 -81920 14450688 <1% AnonPages(Node.1)
5804032 +327680 6131712 +5% Buffers
57851904 +17252352 75104256 +29% Cached
10078793728 -5058560 10073735168 <1% CommitLimit
73453568 +1028096 74481664 +1% Committed_AS
184320 -184320 . -100% Dirty
20480 -20480 . -100% Dirty(Node.0)
163840 -163840 . -100% Dirty(Node.1)
3391488 +352256 3743744 +10% FilePages(Node.0)
60264448 +17227776 77492224 +28% FilePages(Node.1)
50900992 +16818176 67719168 +33% Inactive
561152 +41984 603136 +7% Inactive(Node.0)
12164096 +4162560 16326656 +34% Inactive(Node.1)
8847360 +16384 8863744 <1% Mapped
290816 +45056 335872 +15% Mapped(Node.0)
8556544 -28672 8527872 <1% Mapped(Node.1)
4014837760 -54091776 3960745984 -1% MemFree
2012188672 -16060416 1996128256 <1% MemFree(Node.0)
2002522112 -38031360 1964490752 -1% MemFree(Node.1)
4151279616 -10117120 4141162496 <1% MemTotal
134877184 +16060416 150937600 +11% MemUsed(Node.0)
143912960 +38031360 181944320 +26% MemUsed(Node.1)
2306048 -8192 2297856 <1% PageTables
872448 +32768 905216 +3% PageTables(Node.0)
1433600 -40960 1392640 -2% PageTables(Node.1)
8290304 +217088 8507392 +2% SReclaimable
1155072 -184320 970752 -15% SReclaimable(Node.0)
7135232 +401408 7536640 +5% SReclaimable(Node.1)
12480512 +11087872 23568384 +88% SUnreclaim
4730880 +6569984 11300864 +138% SUnreclaim(Node.0)
7749632 +4517888 12267520 +58% SUnreclaim(Node.1)
20770816 +11304960 32075776 +54% Slab
5885952 +6385664 12271616 +108% Slab(Node.0)
14884864 +4919296 19804160 +33% Slab(Node.1)
159670272 -4096 159666176 <1% VmallocUsed
23140846592 +33765376 23174611968 +0% Totals


Memory usage in a simulated 2cpu/1gb environment using the
default configuration and NR_CPUS=4096, MAX Nodes=512:

Memory: 1013440k/1048576k available
(3588k kernel code, 33728k reserved, 1962k data, 1212k init)

MemTotal: 1014652 kB
MemFree: 991364 kB
Buffers: 192 kB
Cached: 3436 kB
SwapCached: 0 kB
Active: 1636 kB
Inactive: 2648 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 20 kB
Writeback: 0 kB
AnonPages: 656 kB
Mapped: 1412 kB
Slab: 12752 kB
SReclaimable: 236 kB
SUnreclaim: 12516 kB
PageTables: 36 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 507324 kB
Committed_AS: 0 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 4896 kB
VmallocChunk: 34359733471 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB

--


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