linux-kernel - Re: [PATCHv3] mm: Account pud page tables

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Message-ID: <1507060767.10046.23.camel@redhat.com>
Date:   Tue, 03 Oct 2017 15:59:27 -0400
From:   Rik van Riel <riel@...hat.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCHv3] mm: Account pud page tables

On Mon, 2017-10-02 at 11:04 +0300, Kirill A. Shutemov wrote:
> On machine with 5-level paging support a process can allocate
> significant amount of memory and stay unnoticed by oom-killer and
> memory cgroup. The trick is to allocate a lot of PUD page tables.
> We don't account PUD page tables, only PMD and PTE.
> 
> We already addressed the same issue for PMD page tables, see
> dc6c9a35b66b ("mm: account pmd page tables to the process").
> Introduction 5-level paging bring the same issue for PUD page tables.
> 
> The patch expands accounting to PUD level.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> 

Acked-by: Rik van Riel <riel@...hat.com>

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