Subject: Re: [PATCH v3 4/5] powerpc/mm: restore top-down allocation when using movable_node

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Mon, 26 Sep 2016 21:17:43 +0530

Reza Arbab <[email-masked]> writes:

> At boot, the movable_node option sets bottom-up memblock allocation.
>
> This reduces the chance that, in the window before movable memory has
> been identified, an allocation for the kernel might come from a movable
> node. By going bottom-up, early allocations will most likely come from
> the same node as the kernel image, which is necessarily in a nonmovable
> node.
>
> Then, once any known hotplug memory has been marked, allocation can be
> reset back to top-down. On x86, this is done in numa_init(). This patch
> does the same on power, in numa initmem_init().
>
> Signed-off-by: Reza Arbab <[email-masked]>
> ---
>  arch/powerpc/mm/numa.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index d7ac419..fdf1e69 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -945,6 +945,9 @@ void __init initmem_init(void)
>  	max_low_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
>  	max_pfn = max_low_pfn;
>
> +	/* bottom-up allocation may have been set by movable_node */
> +	memblock_set_bottom_up(false);
> +

By then we have done few memblock allocation right ? IMHO, we should do
this early enough in prom.c after we do parse_early_param, with a
comment there explaining that, we don't really support hotplug memblock
and when we do that, this should be moved to a place where we can handle
memblock allocation such that we avoid spreading memblock allocation to
movable node.

>  	if (parse_numa_properties())
>  		setup_nonnuma();
>  	else
> -- 
> 1.8.3.1

-aneesh