Subject: Re: [PATCH v2 1/7] memory-hotplug: add zone_for_memory() for selecting zone for new memory

From: Sergei Shtylyov <[email-masked]>
Date: Mon, 21 Jul 2014 21:19:54 +0400

Hello.

On 07/21/2014 07:46 AM, Wang Nan wrote:

    Some grammar nitpicking.

> This patch introduces a zone_for_memory function in arch independent
> code for arch_add_memory() using.

    s/ using/'s use/.

> Many arch_add_memory() function simply selects ZONE_HIGHMEM or

    Plural needed with "many".

> ZONE_NORMAL and add new memory into it. However, with the existance of
> ZONE_MOVABLE, the selection method should be carefully considered: if
> new, higher memory is added after ZONE_MOVABLE is setup, the default
> zone and ZONE_MOVABLE may overlap each other.

> should_add_memory_movable() checks the status of ZONE_MOVABLE. If it has
> already contain memory, compare the address of new memory and movable
> memory. If new memory is higher than movable, it should be added into
> ZONE_MOVABLE instead of default zone.

> Signed-off-by: Wang Nan <[email-masked]>
> Cc: Zhang Yanfei <[email-masked]>
> Cc: Dave Hansen <[email-masked]>
[...]

> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 469bbf5..348fda7 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1156,6 +1156,34 @@ static int check_hotplug_memory_range(u64 start, u64 size)
>   	return 0;
>   }
>
> +/*
> + * If movable zone has already been setup, newly added memory should be check.

    Checked.

WBR, Sergei