linux-kernel - Re: [PATCH v6 04/51] mm: Move PageDoubleMap bit

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Date:   Thu, 11 Jun 2020 11:03:00 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 04/51] mm: Move PageDoubleMap bit

On 10 Jun 2020, at 16:12, Matthew Wilcox wrote:

> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
>
> PG_private_2 is defined as being PF_ANY (applicable to tail pages
> as well as regular & head pages).  That means that the first tail
> page of a double-map page will appear to have Private2 set.  Use the
> Workingset bit instead which is defined as PF_HEAD so any attempt to
> access the Workingset bit on a tail page will redirect to the head page's
> Workingset bit.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---

Make sense to me.

Reviewed-by: Zi Yan <ziy@...dia.com>

—
Best Regards,
Yan Zi

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