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Re: [PATCH] mm/page_alloc: return 0 in case this node has no page within the zone

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On Mon,  6 Feb 2017 23:43:14 +0800 Wei Yang <richard.weiyang@gmail.com> wrote:

> The whole memory space is divided into several zones and nodes may have no
> page in some zones. In this case, the __absent_pages_in_range() would
> return 0, since the range it is searching for is an empty range.
> 
> Also this happens more often to those nodes with higher memory range when
> there are more nodes, which is a trend for future architectures.
> 
> This patch checks the zone range after clamp and adjustment, return 0 if
> the range is an empty range.

What are the user-visible runtime effects of this change?

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[PATCH] mm/page_alloc: return 0 in case this node has no page within the zone Wei Yang <richard.weiyang@gmail.com> - 2017-02-06 16:50 +0100
  Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Andrew Morton <akpm@linux-foundation.org> - 2017-02-07 00:30 +0100
    Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Wei Yang <richard.weiyang@gmail.com> - 2017-02-07 16:10 +0100
  Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Michal Hocko <mhocko@kernel.org> - 2017-02-07 10:50 +0100
    Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Wei Yang <richard.weiyang@gmail.com> - 2017-02-07 16:40 +0100
      Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Michal Hocko <mhocko@kernel.org> - 2017-02-07 16:50 +0100
        Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Wei Yang <richard.weiyang@gmail.com> - 2017-02-08 15:10 +0100
          Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Michal Hocko <mhocko@kernel.org> - 2017-02-08 16:00 +0100
        Re: [PATCH] mm/page_alloc: return 0 in case this node has no page  within the zone Wei Yang <richard.weiyang@gmail.com> - 2017-02-09 15:10 +0100

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