linux-kernel - Re: [PATCH v4 0/3] mm/hugetlb: memory offline issues with hugepages

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Date:   Thu, 29 Sep 2016 06:14:36 +0000
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     Gerald Schaefer <gerald.schaefer@...ibm.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "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>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v4 0/3] mm/hugetlb: memory offline issues with hugepages

On Mon, Sep 26, 2016 at 07:28:08PM +0200, Gerald Schaefer wrote:
> This addresses several issues with hugepages and memory offline. While
> the first patch fixes a panic, and is therefore rather important, the
> last patch is just a performance optimization.
> 
> The second patch fixes a theoretical issue with reserved hugepages,
> while still leaving some ugly usability issue, see description.
> 
> Changes in v4:
> - Add check for free vs. reserved hugepages
> - Revalidate checks in dissolve_free_huge_page() after taking the lock
> - Split up into 3 patches
> 
> Changes in v3:
> - Add Fixes: c8721bbb
> - Add Cc: stable
> - Elaborate on losing the gigantic page vs. failing memory offline
> - Move page_count() check out of dissolve_free_huge_page()
> 
> Changes in v2:
> - Update comment in dissolve_free_huge_pages()
> - Change locking in dissolve_free_huge_page()
> 
> Gerald Schaefer (3):
>   mm/hugetlb: fix memory offline with hugepage size > memory block size
>   mm/hugetlb: check for reserved hugepages during memory offline
>   mm/hugetlb: improve locking in dissolve_free_huge_pages()
> 
>  include/linux/hugetlb.h |  6 +++---
>  mm/hugetlb.c            | 47 +++++++++++++++++++++++++++++++++++------------
>  mm/memory_hotplug.c     |  4 +++-
>  3 files changed, 41 insertions(+), 16 deletions(-)

I'm happy with these patches fixing/improving hugetlb offline code,
thank you very much, Gerald and reviewers/testers!

For patchset ...

Acked-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>