linux-kernel - Re: [PATCH v3 2/2] proc: Add getting pages info of ZONE

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Message-ID: <YeBFxBwaHtfs8jmg@dhcp22.suse.cz>
Date:   Thu, 13 Jan 2022 16:31:16 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     sxwjean@...com
Cc:     akpm@...ux-foundation.org, david@...hat.com,
        dan.j.williams@...el.com, osalvador@...e.de,
        naoya.horiguchi@....com, thunder.leizhen@...wei.com,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xiongwei Song <sxwjean@...il.com>
Subject: Re: [PATCH v3 2/2] proc: Add getting pages info of ZONE_DEVICE
 support

On Wed 12-01-22 22:35:17, sxwjean@...com wrote:
> From: Xiongwei Song <sxwjean@...il.com>
> 
> When requesting pages info by /proc/kpage*, the pages in ZONE_DEVICE were
> ignored.
> 
> The pfn_to_devmap_page() function can help to get page that belongs to
> ZONE_DEVICE.

Why is this needed? Who would consume that information and what for?
-- 
Michal Hocko
SUSE Labs