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Date:   Tue, 4 Apr 2017 13:30:13 -0500
From:   Reza Arbab <>
To:     Michal Hocko <>
Cc:     Mel Gorman <>,,
        Andrew Morton <>,
        Vlastimil Babka <>,
        Andrea Arcangeli <>,
        Yasuaki Ishimatsu <>,
        Tang Chen <>,,
        Kani Toshimitsu <>,,
        Joonsoo Kim <>,
        Andi Kleen <>,
        Zhang Zhen <>,
        David Rientjes <>,
        Daniel Kiper <>,
        Igor Mammedov <>,
        Vitaly Kuznetsov <>,
        LKML <>,
        Chris Metcalf <>,
        Dan Williams <>,
        Heiko Carstens <>,
        Lai Jiangshan <>,
        Martin Schwidefsky <>
Subject: Re: [PATCH 0/6] mm: make movable onlining suck less

On Tue, Apr 04, 2017 at 06:44:53PM +0200, Michal Hocko wrote:
>Thanks for your testing! This is highly appreciated.
>Can I assume your Tested-by?

Of course! Not quite done, though. I think I found another edge case.  
You get an oops when removing all of a node's memory:


I stuck some debugging prints in, for context:

shrink_pgdat_span: start_pfn=0x10000, end_pfn=0x10100, pgdat_start_pfn=0x0, pgdat_end_pfn=0x20000
shrink_pgdat_span: start_pfn=0x10100, end_pfn=0x10200, pgdat_start_pfn=0x0, pgdat_end_pfn=0x20000
shrink_pgdat_span: start_pfn=0x1fe00, end_pfn=0x1ff00, pgdat_start_pfn=0x0, pgdat_end_pfn=0x20000
shrink_pgdat_span: start_pfn=0x1ff00, end_pfn=0x20000, pgdat_start_pfn=0x0, pgdat_end_pfn=0x20000
find_biggest_section_pfn: start_pfn=0x0, end_pfn=0x1ff00
find_biggest_section_pfn loop: pfn=0x1feff, sec_nr = 0x1fe
find_biggest_section_pfn loop: pfn=0x1fdff, sec_nr = 0x1fd
find_biggest_section_pfn loop: pfn=0x1ff, sec_nr = 0x1
find_biggest_section_pfn loop: pfn=0xff, sec_nr = 0x0
find_biggest_section_pfn loop: pfn=0xffffffffffffffff, sec_nr = 0xffffffffffffff
Unable to handle kernel paging request for data at address 0xc000800000f19e78

Reza Arbab

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