Date:   Thu, 13 Jan 2022 16:31:16 +0100
From:   Michal Hocko <mhocko@suse.com>
To:     sxwjean@me.com
Cc:     akpm@linux-foundation.org, david@redhat.com,
        dan.j.williams@intel.com, osalvador@suse.de,
        naoya.horiguchi@nec.com, thunder.leizhen@huawei.com,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, Xiongwei Song <sxwjean@gmail.com>
Subject: Re: [PATCH v3 2/2] proc: Add getting pages info of ZONE_DEVICE
 support
Message-ID: <YeBFxBwaHtfs8jmg@dhcp22.suse.cz>
References: <20220112143517.262143-1-sxwjean@me.com>
 <20220112143517.262143-3-sxwjean@me.com>
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On Wed 12-01-22 22:35:17, sxwjean@me.com wrote:
> From: Xiongwei Song <sxwjean@gmail.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