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
..
alpha	alpha: Remove custom dec_and_lock() implementation	2018-06-12 23:33:24 +02:00
arc	mm: introduce ARCH_HAS_PTE_SPECIAL	2018-06-07 17:34:35 -07:00
arm	ARM: disable KCOV for trusted foundations code	2018-07-03 17:32:19 -07:00
arm64	ARM: SoC fixes for 4.18-rc	2018-06-30 14:08:06 -07:00
c6x	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 20:27:54 -07:00
h8300	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 20:27:54 -07:00
hexagon	hexagon: drop the unused variable zero_page_mask	2018-06-15 07:55:25 +09:00
ia64	- Error path bug fix for overflow tests (Dan)	2018-06-12 18:28:00 -07:00
m68k	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu	2018-06-05 10:51:30 -07:00
microblaze	Microblaze patches for 4.18-rc3	2018-06-27 09:49:30 -07:00
mips	MIPS: Add ksig argument to rseq_{signal_deliver,handle_notify_resume}	2018-06-24 10:33:03 -07:00
nds32	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 20:27:54 -07:00
nios2	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-06-04 20:27:54 -07:00
openrisc	openrisc: entry: Fix delay slot exception detection	2018-07-01 16:48:24 +09:00
parisc	parisc: Build kernel without -ffunction-sections	2018-06-29 17:27:20 +02:00
powerpc	Kbuild fixes for v4.18	2018-06-30 13:05:30 -07:00
riscv	RISC-V Updates for the 4.18 Merge Window	2018-06-16 06:42:43 +09:00
s390	bpf, s390: fix potential memleak when later bpf_jit_prog fails	2018-06-29 10:47:35 -07:00
sh	arch/*: Kconfig: fix documentation for NMI watchdog	2018-06-15 12:48:59 -03:00
sparc	arch/*: Kconfig: fix documentation for NMI watchdog	2018-06-15 12:48:59 -03:00
um	Solve a series of broken links for files under Documentation:	2018-06-17 05:25:18 +09:00
unicore32	docs: Fix some broken references	2018-06-15 18:10:01 -03:00
x86	x86/numa_emulation: Introduce uniform split capability	2018-07-06 18:48:58 +02:00
xtensa	docs: Fix some broken references	2018-06-15 18:10:01 -03:00
.gitignore
Kconfig	docs: Fix some broken references	2018-06-15 18:10:01 -03:00