linux-kernel - Re: [mm PATCH v3 4/6] mm: Move hot-plug specific memory init into separate functions and optimize

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Message-ID: <20181024123640.GF18839@dhcp22.suse.cz>
Date:   Wed, 24 Oct 2018 14:36:40 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        pavel.tatashin@...rosoft.com, dave.jiang@...el.com,
        linux-kernel@...r.kernel.org, willy@...radead.org,
        davem@...emloft.net, yi.z.zhang@...ux.intel.com,
        khalid.aziz@...cle.com, rppt@...ux.vnet.ibm.com, vbabka@...e.cz,
        sparclinux@...r.kernel.org, dan.j.williams@...el.com,
        ldufour@...ux.vnet.ibm.com, mgorman@...hsingularity.net,
        mingo@...nel.org, kirill.shutemov@...ux.intel.com
Subject: Re: [mm PATCH v3 4/6] mm: Move hot-plug specific memory init into
 separate functions and optimize

On Wed 17-10-18 08:26:20, Alexander Duyck wrote:
[...]
> With that said I am also wondering if a possible solution to the complaints
> you had would be to look at just exporting the __init_pageblock function
> later and moving the call to memmap_init_zone_device out to the memremap or
> hotplug code when Dan gets the refactoring for HMM and memremap all sorted
> out.

Why cannot we simply provide a constructor for each page by the caller
if there are special requirements? we currently have alt_map to do
struct page allocation but nothing really prevents to make it more
generic and control both allocation and initialization whatever suits a
specific usecase. I really do not want make special cases here and
there.
-- 
Michal Hocko
SUSE Labs