linux-kernel - Re: [RFC PATCH 01/16] mm: add pagechain container for storing multiple pages.

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Message-ID: <20200907122228.4zlyfysdul3s62me@box>
Date:   Mon, 7 Sep 2020 15:22:28 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Zi Yan <ziy@...dia.com>
Cc:     linux-mm@...ck.org, Roman Gushchin <guro@...com>,
        Rik van Riel <riel@...riel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        David Nellans <dnellans@...dia.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 01/16] mm: add pagechain container for storing
 multiple pages.

On Wed, Sep 02, 2020 at 02:06:13PM -0400, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> When depositing page table pages for 1GB THPs, we need 512 PTE pages +
> 1 PMD page. Instead of counting and depositing 513 pages, we can use the
> PMD page as a leader page and chain the rest 512 PTE pages with ->lru.
> This, however, prevents us depositing PMD pages with ->lru, which is
> currently used by depositing PTE pages for 2MB THPs. So add a new
> pagechain container for PMD pages.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>

Just deposit it to a linked list in the mm_struct as we do for PMD if
split ptl disabled.

-- 
 Kirill A. Shutemov