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: <1631771e-371b-c233-ec0f-056646694c85@de.ibm.com>
Date:   Tue, 5 May 2020 11:36:14 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Mike Rapoport <rppt@...ux.ibm.com>
Cc:     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



On 04.05.20 23:08, Stephen Rothwell wrote:
> Hi Mike,
> 
> On Mon, 4 May 2020 18:44:10 +0300 Mike Rapoport <rppt@...ux.ibm.com> wrote:
>>
>> 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/
> 
> I have added that to linux-next for today.
> 

Ack, 5.7.0-rc4-next-20200505 seems to work fine.