linux-kernel - Re: [PATCH 0/1] memory offline issues with hugepage size

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Message-ID: <57E175B3.1040802@linux.intel.com>
Date:   Tue, 20 Sep 2016 10:45:23 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Rui Teng <rui.teng@...ux.vnet.ibm.com>
Subject: Re: [PATCH 0/1] memory offline issues with hugepage size > memory
 block size

On 09/20/2016 10:37 AM, Mike Kravetz wrote:
> 
> Their approach (I believe) would be to fail the offline operation in
> this case.  However, I could argue that failing the operation, or
> dissolving the unused huge page containing the area to be offlined is
> the right thing to do.

I think the right thing to do is dissolve the whole huge page if even a
part of it is offlined.  The only question is what to do with the
gigantic remnants.