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Message-ID: <20160929061435.GA3073@hori1.linux.bs1.fc.nec.co.jp>
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>
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