[PATCH 2/2] arm64/numa: support HAVE_MEMORYLESS_NODES
From: Will Deacon <hidden>
Date: 2016-10-26 18:36:17
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linux-mm, lkml
On Tue, Oct 25, 2016 at 10:59:18AM +0800, Zhen Lei wrote:
quoted hunk ↗ jump to hunk
Some numa nodes may have no memory. For example: 1) a node has no memory bank plugged. 2) a node has no memory bank slots. To ensure percpu variable areas and numa control blocks of the memoryless numa nodes to be allocated from the nearest available node to improve performance, defined node_distance_ready. And make its value to be true immediately after node distances have been initialized. Signed-off-by: Zhen Lei <redacted> --- arch/arm64/Kconfig | 4 ++++ arch/arm64/include/asm/numa.h | 3 +++ arch/arm64/mm/numa.c | 6 +++++- 3 files changed, 12 insertions(+), 1 deletion(-)diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 30398db..648dd13 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig@@ -609,6 +609,10 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK def_bool y depends on NUMA +config HAVE_MEMORYLESS_NODES + def_bool y + depends on NUMA
Given that patch 1 and the associated node_distance_ready stuff is all an unqualified performance optimisation, is there any merit in just enabling HAVE_MEMORYLESS_NODES in Kconfig and then optimising things as a separate series when you have numbers to back it up? Will