[PATCH 2/2] arm64/numa: support HAVE_MEMORYLESS_NODES
Will Deacon
will.deacon at arm.com
Wed Oct 26 11:36:14 PDT 2016
On Tue, Oct 25, 2016 at 10:59:18AM +0800, Zhen Lei wrote:
> 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 <thunder.leizhen at huawei.com>
> ---
> 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
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