linux-kernel - 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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Message-ID: <20200504154410.GF342687@linux.ibm.com>
Date:   Mon, 4 May 2020 18:44:10 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Marc Hartmayer <mhartmay@...ux.ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: linux-next: Tree for May 4 --> mm: free_area_init: allow
 defining max_zone_pfn in descending order does increase memory use

Ho Christian,

On Mon, May 04, 2020 at 04:50:06PM +0200, Christian Borntraeger wrote:
> 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?

Yeah, this patch is buggy. In short, it breaks zone size calculation on
s390 and some other architectures.

I've just replied at [1] with more details and a fix.

[1] https://lore.kernel.org/linux-mm/20200504153901.GM14260@kernel.org/

-- 
Sincerely yours,
Mike.