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Subject: Re: memory offline infinite loop after soft offline
To:     Michal Hocko <mhocko@kernel.org>
Cc:     Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Qian Cai <cai@lca.pw>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        Mike Kravetz <mike.kravetz@oracle.com>
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From:   David Hildenbrand <david@redhat.com>
Organization: Red Hat GmbH
Message-ID: <f065d998-7fa3-ef9a-c2f4-5b9116f5596b@redhat.com>
Date:   Fri, 18 Oct 2019 10:38:21 +0200
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On 18.10.19 10:24, Michal Hocko wrote:
> On Fri 18-10-19 10:13:36, David Hildenbrand wrote:
> [...]
>> However, if the compound page spans multiple pageblocks
> 
> Although hugetlb pages spanning pageblocks are possible this shouldn't
> matter in__test_page_isolated_in_pageblock because this function doesn't
> really operate on pageblocks as the name suggests.  It is simply
> traversing all valid RAM ranges (see walk_system_ram_range).

As long as the hugepages don't span memory blocks/sections, you are 
right. I have no experience with gigantic pages in this regard.

-- 

Thanks,

David / dhildenb