Re: linux-next: Tree for May 4 --> mm: free_area_init: allow defining max_zone_pfn in descending order does increase memory use

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Subject: Re: linux-next: Tree for May 4 --> mm: free_area_init: allow defining max_zone_pfn in descending order does increase memory use
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Date: Mon, 4 May 2020 16:50:06 +0200
Cc: Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Marc Hartmayer <mhartmay@xxxxxxxxxxxxx>, linux-s390 <linux-s390@xxxxxxxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>
In-reply-to: <20200504173547.2cdd83bf@canb.auug.org.au>
References: <20200504173547.2cdd83bf@canb.auug.org.au>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0

Mike,
commit 51a2f644fd020d5f090044825c388444d11029d ("mm: free_area_init: allow defining max_zone_pfn in descending order")
does increase the memory use on s390 (e.g. 700 MB vs.1.8 GB).

Something is odd in this patch. Any idea?

Follow-Ups:
- Re: linux-next: Tree for May 4 --> mm: free_area_init: allow defining max_zone_pfn in descending order does increase memory use
  - From: Mike Rapoport

References:
- linux-next: Tree for May 4
  - From: Stephen Rothwell

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