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Subject[PATCH 00/12] cpumask: reduce stack pressure from local/passed cpumask variables v2

Modify usage of cpumask_t variables to use pointers as much as possible.

Changes are:

* Use an allocated array of cpumask_t's for cpumask_of_cpu() when
large NR_CPUS count is present. This removes 26168 bytes of stack
usage (see chart below), as well as reduces the code generated for
each usage.

* Modify set_cpus_allowed to pass a pointer to the "newly allowed"
cpumask. This removes 10792 bytes of stack usage but is an
ABI change.

* Add node_to_cpumask_ptr that returns pointer to cpumask for the
specified node. This removes 10256 bytes of stack usage.

* Modify build_sched_domains and related sub-functions to pass
pointers to cpumask temp variables. This consolidates stack
space that was spread over various functions.

* Remove large array from numa_initmem_init() [-8248 bytes].

* Optimize usages of {CPU,NODE}_MASK_{NONE,ALL} [-9408 bytes].
* Various other changes to reduce stacksize and silence checkpatch
warnings [-7672 bytes].

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git

Cc: Anton Blanchard <anton@samba.org>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Cliff Wickman <cpw@sgi.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: William L. Irwin <wli@holomorphy.com>

Signed-off-by: Mike Travis <travis@sgi.com>
---
v2: resubmitted based on x86/latest.

Summaries:

1 - Memory Usages Changes
2 - Build & Test Results

--- ---------------------------------------------------------
* Memory Usages Changes
Patch list summary of various memory usage changes using the akpm2
config file with NR_CPUS=4096 and MAX_NUMNODES=512.


====== Data (-l 500)
1 - initial
2 - cpumask_of_cpu
8 - sched_domain
13 - CPU_NODE_MASK
.1. .2. .8. .13. ..final..
3553 . -1146 +320 2727 -23% build_sched_domains(.text)
533 -533 . . . -100% hpet_enable(.init.text)
512 . . -512 . -100% C(.rodata)
0 . . +512 512 . cpu_mask_all(.data)
4598 -533 -1146 +320 3239 -29% Totals

====== Text/Data ()
1 - initial
2 - cpumask_of_cpu
3 - set_cpus_allowed
6 - numa_initmem_init
9 - kern_sched
13 - CPU_NODE_MASK
.1. .2. .3. .6. .9. .13. ..final..
3397632 -2048 . . . . 3395584 <1% TextSize
1642496 +2048 +4096 . -4096 -4096 1640448 <1% DataSize
1658880 . . +8192 . . 1667072 <1% InitSize
287709184 . +4096 . -4096 +4096 287713280 <1% OtherSize
294408192 . +8192 +8192 -8192 . 294416384 +0% Totals

====== Stack (-l 500)
1 - initial
2 - cpumask_of_cpu
3 - set_cpus_allowed
4 - cpumask_affinity
6 - numa_initmem_init
7 - node_to_cpumask_ptr
8 - sched_domain
9 - kern_sched
11 - build_sched_domains
12 - cpu_coregroup_map
13 - CPU_NODE_MASK
.1. .2. .3. .4. .6. .7. .8. .9. .11. .12. .13. ..final..
11080 . . . . -512 -6352 . -976 +16 -512 2744 -75% build_sched_domains
8248 . . . -8248 . . . . . . . -100% numa_initmem_init
3672 -1024 -496 . . . . . . . . 2152 -41% centrino_target
3176 . . . . -2576 . . . . . 600 -81% sched_domain_node_span
3096 -1536 -520 . . . . . . . . 1040 -66% acpi_processor_set_throttling
2600 -1536 . . . . . . . . -512 552 -78% powernowk8_cpu_init
2120 -1024 -512 . . . . . . . . 584 -72% cache_add_dev
2104 -1008 . . . . . . . . -512 584 -72% powernowk8_target
2104 . -512 . . . . . . . -512 1080 -48% _cpu_down
2072 -512 . . . . . . . . . 1560 -24% tick_notify
2064 -1024 . . . . . . . . -504 536 -74% check_supported_cpu
2056 . -1544 +520 . . . . . . . 1032 -49% sched_setaffinity
2056 -1024 -512 . . . . . . . . 520 -74% get_cur_freq
2056 . -512 -1032 . . . . . . -512 . -100% affinity_set
2056 -1024 -520 . . . . . . . . 512 -75% acpi_processor_get_throttling
2056 -1024 -512 . . . . . . . . 520 -74% acpi_processor_ffh_cstate_probe
2048 -1016 -520 . . . . . . . . 512 -75% powernowk8_get
1784 -1024 . . . . . . . . . 760 -57% cpufreq_add_dev
1768 . -512 . . -1256 . . . . . . -100% kswapd
1608 -1608 . . . . . . . . . . -100% disable_smp
1592 . . . . -1592 . . . . . . -100% do_tune_cpucache
1576 . . . . . . -480 . . -1096 . -100% init_sched_build_groups
1560 . -528 . . -512 . . . . . 520 -66% pci_device_probe
1552 . -512 . . . . . . . -1040 . -100% kthreadd
1544 -1024 -520 . . . . . . . . . -100% stopmachine
1544 -1032 -512 . . . . . . . . . -100% native_machine_shutdown
1544 -1008 . . . . . . . . . 536 -65% alloc_ldt
1536 -504 . . . . . . . . . 1032 -32% smp_call_function_single
1536 -1024 . . . . . . . . . 512 -66% native_smp_send_reschedule
1176 . . . . . . -512 . . . 664 -43% thread_return
1176 . . . . . . -512 . . . 664 -43% schedule
1160 . . . . . . -512 . . . 648 -44% run_rebalance_domains
1160 . . . . -1160 . . . . . . -100% __build_all_zonelists
1144 . . +512 . . . . . . -512 1144 . threshold_create_device
1080 . -520 . . . . . . . . 560 -48% pdflush
1080 . -512 . . . . . . . -568 . -100% kernel_init
1064 . . . . -1064 . . . . . . -100% cpuup_canceled
1064 . . . . -1064 . . . . . . -100% cpuup_callback
1032 -1032 . . . . . . . . . . -100% setup_pit_timer
1032 . . . . . . . . . -520 512 -50% physflat_vector_allocation_domain
1032 -1032 . . . . . . . . . . -100% init_workqueues
1032 -1032 . . . . . . . . . . -100% init_idle
1032 . . . . . . . . . -512 520 -49% destroy_irq
1024 . . -512 . . . . . . . 512 -50% sys_sched_setaffinity
1024 -1024 . . . . . . . . . . -100% setup_APIC_timer
1024 . -504 . . . . . . . . 520 -49% sched_init_smp
1024 -1024 . . . . . . . . . . -100% native_smp_prepare_cpus
1024 -1024 . . . . . . . . . . -100% kthread_bind
1024 -1024 . . . . . . . . . . -100% hpet_enable
1024 . . -512 . . . . . . . 512 -50% compat_sys_sched_setaffinity
1024 . . . . . . . . . -512 512 -50% __percpu_populate_mask
1024 . -512 . . . . . . . -512 . -100% ____call_usermodehelper
568 . . . . . . -568 . . . . -100% cpu_attach_domain
552 . . . . . . . . . -552 . -100% migration_call
520 . . . . -520 . . . . . . -100% node_read_cpumap
520 . . . . . . . . . -520 . -100% dynamic_irq_init
520 . . . . . . -8 . -512 . . -100% cpu_to_phys_group
520 . . . . . . -520 . . . . -100% cpu_to_core_group
0 . . . . . +760 . . . . 760 . sd_init_SIBLING
0 . . . . . +760 . . . . 760 . sd_init_NODE
0 . . . . . +752 . . . . 752 . sd_init_MC
0 . . . . . +752 . . . . 752 . sd_init_CPU
0 . . . . . +752 . . . . 752 . sd_init_ALLNODES
0 . . . . . . +512 . . . 512 . detach_destroy_domains
101488 -26168 -10792 -1024 -8248 -10256 -2576 -2600 -976 -496 -9408 28944 -71% Totals
--- ---------------------------------------------------------
* Build & Test Results
Built/tested:

nosmp
nonuma
defconfig (NR_CPUS/MAX_NUMANODES: 32/64 and 4096/512)
akpm2 config (NR_CPUS/MAX_NUMANODES: 255/64 and 4096/512)

Built no errors:

allyesconfig
allnoconfig
allmodconfig
current-x86_64-default
current-ia64-sn2
current-ia64-default
current-ia64-nosmp
current-ia64-zx1
current-s390-default
current-arm-default
current-sparc-default
current-sparc64-default
current-sparc64-smp
current-ppc-pmac32

Not Built (previous errors):

current-x86_64-single
drivers/built-in.o: In function `sas_request_addr':
(.text+0x814bd): undefined reference to `request_firmware'
drivers/built-in.o: In function `sas_request_addr':
(.text+0x81556): undefined reference to `release_firmware'
current-x86_64-8psmp
drivers/built-in.o: In function `sas_request_addr':
(.text+0x814bd): undefined reference to `request_firmware'
drivers/built-in.o: In function `sas_request_addr':
(.text+0x81556): undefined reference to `release_firmware'
current-x86_64-debug
sas_scsi_host.c:1091: undefined reference to `request_firmware'
sas_scsi_host.c:1103: undefined reference to `release_firmware'
current-x86_64-numa
drivers/built-in.o: In function `sas_request_addr':
(.text+0x8540d): undefined reference to `request_firmware'
drivers/built-in.o: In function `sas_request_addr':
(.text+0x854a6): undefined reference to `release_firmware'
current-i386-single
drivers/built-in.o: In function `sas_request_addr':
(.text+0x7617a): undefined reference to `request_firmware'
drivers/built-in.o: In function `sas_request_addr':
(.text+0x76208): undefined reference to `release_firmware'
current-i386-smp
drivers/built-in.o: In function `sas_request_addr':
(.text+0x7985a): undefined reference to `request_firmware'
drivers/built-in.o: In function `sas_request_addr':
(.text+0x798e8): undefined reference to `release_firmware'
current-ppc-smp
WRAP arch/powerpc/boot/uImage
ln: accessing `arch/powerpc/boot/uImage': No such file or directory

(Note: build with patches applied did not change errors.)


--- ---------------------------------------------------------
--


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