Dan Williams cc9aec03e5 x86/numa_emulation: Introduce uniform split capability ... The current NUMA emulation capabilities for splitting System RAM by a fixed size or by a set number of nodes may result in some nodes being larger than others. The implementation prioritizes establishing a minimum usable memory size over satisfying the requested number of NUMA nodes. Introduce a uniform split capability that evenly partitions each physical NUMA node into N emulated nodes. For example numa=fake=3U creates 6 emulated nodes total on a system that has 2 physical nodes. This capability is useful for debugging and evaluating platform memory-side-cache capabilities as described by the ACPI HMAT (see 5.2.27.5 Memory Side Cache Information Structure in ACPI 6.2a) Compare numa=fake=6 that results in only 5 nodes being created against numa=fake=3U which takes the 2 physical nodes and evenly divides them. numa=fake=6 available: 5 nodes (0-4) node 0 cpus: 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 node 0 size: 2648 MB node 0 free: 2443 MB node 1 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 node 1 size: 2672 MB node 1 free: 2442 MB node 2 cpus: 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 node 2 size: 5291 MB node 2 free: 5278 MB node 3 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 node 3 size: 2677 MB node 3 free: 2665 MB node 4 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 node 4 size: 2676 MB node 4 free: 2663 MB node distances: node 0 1 2 3 4 0: 10 20 10 20 20 1: 20 10 20 10 10 2: 10 20 10 20 20 3: 20 10 20 10 10 4: 20 10 20 10 10 numa=fake=3U available: 6 nodes (0-5) node 0 cpus: 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 node 0 size: 2900 MB node 0 free: 2637 MB node 1 cpus: 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 node 1 size: 3023 MB node 1 free: 3012 MB node 2 cpus: 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 node 2 size: 2015 MB node 2 free: 2004 MB node 3 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 node 3 size: 2704 MB node 3 free: 2522 MB node 4 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 node 4 size: 2709 MB node 4 free: 2698 MB node 5 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 node 5 size: 2612 MB node 5 free: 2601 MB node distances: node 0 1 2 3 4 5 0: 10 10 10 20 20 20 1: 10 10 10 20 20 20 2: 10 10 10 20 20 20 3: 20 20 20 10 10 10 4: 20 20 20 10 10 10 5: 20 20 20 10 10 10 Signed-off-by: Dan Williams <dan.j.williams@intel.com> Cc: David Rientjes <rientjes@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/153089328617.27680.14930758266174305832.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2018-07-06 18:48:58 +02:00
..
boot	efi/x86: Fix incorrect invocation of PciIo->Attributes()	2018-06-24 09:05:58 +02:00
configs
crypto	crypto: x86/salsa20 - remove x86 salsa20 implementations	2018-05-31 00:13:57 +08:00
entry	x86/entry/64/compat: Fix "x86/entry/64/compat: Preserve r8-r11 in int $0x80"	2018-06-27 09:35:40 +02:00
events	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
hyperv	x86/hyper-v: move struct hv_flush_pcpu{,ex} definitions to common header	2018-05-26 14:14:33 +02:00
ia32	syscalls/x86: auto-create compat_sys_*() prototypes	2018-04-02 20:16:18 +02:00
include	x86/mm: Drop unneeded __always_inline for p4d page table helpers	2018-06-27 09:55:26 +02:00
kernel	x86/e820: put !E820_TYPE_RAM regions into memblock.reserved	2018-06-28 11:16:44 -07:00
kvm	kvm: vmx: Nested VM-entry prereqs for event inj.	2018-06-22 16:46:26 +02:00
lib	libnvdimm for 4.18	2018-06-08 17:21:52 -07:00
math-emu
mm	x86/numa_emulation: Introduce uniform split capability	2018-07-06 18:48:58 +02:00
net	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
oprofile	x86/oprofile: Fix bogus GCC-8 warning in nmi_setup()	2018-02-21 09:54:17 +01:00
pci	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
platform	x86/efi: Fix efi_call_phys_epilog() with CONFIG_X86_5LEVEL=y	2018-06-27 09:52:52 +02:00
power	x86/mm: Stop pretending pgtable_l5_enabled is a variable	2018-05-19 11:56:57 +02:00
purgatory	kernel/kexec_file.c: move purgatories sha256 to common code	2018-04-13 17:10:28 -07:00
ras
realmode	x86-64/realmode: Add instruction suffix	2018-02-20 09:33:41 +01:00
tools	x86: Treat R_X86_64_PLT32 as R_X86_64_PC32	2018-02-22 09:01:10 -08:00
um	Kconfig updates for v4.18	2018-06-06 11:31:45 -07:00
video
xen	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-24 19:59:52 +08:00
.gitignore	x86/build: Add arch/x86/tools/insn_decoder_test to .gitignore	2018-02-13 14:10:29 +01:00
Kbuild
Kconfig	Kbuild: rename HAVE_CC_STACKPROTECTOR config variable	2018-06-15 07:15:28 +09:00
Kconfig.cpu	Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-03-25 07:36:02 -10:00
Kconfig.debug	x86, nfit_test: Add unit test for memcpy_mcsafe()	2018-05-22 23:18:31 -07:00
Makefile	Merge branch 'linus' into x86/urgent	2018-06-22 21:20:35 +02:00
Makefile_32.cpu
Makefile.um