linux-kernel - Re: [PATCH v3 0/3] page_owner: Fix refcount imbalance

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Message-ID: <e0110a0a-9bde-4e83-8e2a-2631e1bad0cf@ghiti.fr>
Date: Fri, 29 Mar 2024 07:39:33 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Oscar Salvador <osalvador@...e.de>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 Michal Hocko <mhocko@...e.com>, Vlastimil Babka <vbabka@...e.cz>,
 Marco Elver <elver@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>,
 Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH v3 0/3] page_owner: Fix refcount imbalance

Hi Oscar,

On 26/03/2024 07:30, Oscar Salvador wrote:
> This series consists of a refactoring/correctness of updating the metadata
> of tail pages and a couple of fixups for the refcounting part.
>
>  From this series on, instead of counting the stacks, we count the outstanding
> nr_base_pages each stack has, which gives us a much better memory overview.
> The other fixup is for the migration part.
>
> A more detailed explanation can be found in the changelog of the respective
> patches.
>
> Oscar Salvador (3):
>    mm,page_owner: Update metada for tail pages
>    mm,page_owner: Fix refcount imbalance
>    mm,page_owner: Fix accounting of pages when migrating
>
>   Documentation/mm/page_owner.rst |  73 +++++++------
>   mm/page_owner.c                 | 184 +++++++++++++++++++-------------
>   2 files changed, 146 insertions(+), 111 deletions(-)
>

This fixes the following report from syzbot: 
https://lore.kernel.org/linux-riscv/00000000000070a2660614b83885@google.com/T/#t

So you can add:

Tested-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex