linux-kernel - Re: [PATCH v3 00/15] HWPOISON: soft offline rework

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Date:   Fri, 26 Jun 2020 09:35:21 -0400
From:   Qian Cai <cai@....pw>
To:     nao.horiguchi@...il.com
Cc:     linux-mm@...ck.org, mhocko@...nel.org, akpm@...ux-foundation.org,
        mike.kravetz@...cle.com, osalvador@...e.de, tony.luck@...el.com,
        david@...hat.com, aneesh.kumar@...ux.vnet.ibm.com,
        zeil@...dex-team.ru, naoya.horiguchi@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/15] HWPOISON: soft offline rework

On Wed, Jun 24, 2020 at 03:01:22PM +0000, nao.horiguchi@...il.com wrote:
> I rebased soft-offline rework patchset [1][2] onto the latest mmotm.  The
> rebasing required some non-trivial changes to adjust, but mainly that was
> straightforward.  I confirmed that the reported problem doesn't reproduce on
> compaction after soft offline.  For more precise description of the problem
> and the motivation of this patchset, please see [2].
> 
> I think that the following two patches in v2 are better to be done with
> separate work of hard-offline rework, so it's not included in this series.
> 
>   - mm,hwpoison: Take pages off the buddy when hard-offlining
>   - mm/hwpoison-inject: Rip off duplicated checks
> 
> These two are not directly related to the reported problem, so they seems
> not urgent.  And the first one breaks num_poisoned_pages counting in some
> testcases, and The second patch needs more consideration about commented point.
> 
> Any comment/suggestion/help would be appreciated.

Next-20200626 failed to compile due to this series. Reverting the whole
thing [1] will fix the issue below right away,

mm/memory-failure.c: In function ‘__soft_offline_page’:
mm/memory-failure.c:1827:3: error: implicit declaration of function ‘page_handle_poison’; did you mean ‘page_init_poison’? [-Werror=implicit-function-declaration]
   page_handle_poison(page, false, true);
   ^~~~~~~~~~~~~~~~~~
   page_init_poison

.config used,

https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config

[1] git revert --no-edit f296ba1d3a07..0bd1762119e9

> 
> [1] v1: https://lore.kernel.org/linux-mm/1541746035-13408-1-git-send-email-n-horiguchi@ah.jp.nec.com/
> [2] v2: https://lore.kernel.org/linux-mm/20191017142123.24245-1-osalvador@suse.de/
> 
> Thanks,
> Naoya Horiguchi
> ---
> Summary:
> 
> Naoya Horiguchi (7):
>       mm,hwpoison: cleanup unused PageHuge() check
>       mm, hwpoison: remove recalculating hpage
>       mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED
>       mm,hwpoison-inject: don't pin for hwpoison_filter
>       mm,hwpoison: remove MF_COUNT_INCREASED
>       mm,hwpoison: remove flag argument from soft offline functions
>       mm,hwpoison: introduce MF_MSG_UNSPLIT_THP
> 
> Oscar Salvador (8):
>       mm,madvise: Refactor madvise_inject_error
>       mm,hwpoison: Un-export get_hwpoison_page and make it static
>       mm,hwpoison: Kill put_hwpoison_page
>       mm,hwpoison: Unify THP handling for hard and soft offline
>       mm,hwpoison: Rework soft offline for free pages
>       mm,hwpoison: Rework soft offline for in-use pages
>       mm,hwpoison: Refactor soft_offline_huge_page and __soft_offline_page
>       mm,hwpoison: Return 0 if the page is already poisoned in soft-offline
> 
>  drivers/base/memory.c      |   2 +-
>  include/linux/mm.h         |  12 +-
>  include/linux/page-flags.h |   6 +-
>  include/ras/ras_event.h    |   3 +
>  mm/hwpoison-inject.c       |  18 +--
>  mm/madvise.c               |  39 +++---
>  mm/memory-failure.c        | 331 ++++++++++++++++++++-------------------------
>  mm/migrate.c               |  11 +-
>  mm/page_alloc.c            |  63 +++++++--
>  9 files changed, 233 insertions(+), 252 deletions(-)
>