linux-kernel - Re: [PATCH v5 4/4] mm: Defer ZONE_DEVICE page initialization to the point where we init pgmap

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Message-ID: <20180927112041.GG6278@dhcp22.suse.cz>
Date:   Thu, 27 Sep 2018 13:20:41 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     alexander.h.duyck@...ux.intel.com, Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Pasha Tatashin <pavel.tatashin@...rosoft.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        rppt@...ux.vnet.ibm.com, Logan Gunthorpe <logang@...tatee.com>,
        Ingo Molnar <mingo@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v5 4/4] mm: Defer ZONE_DEVICE page initialization to the
 point where we init pgmap

On Wed 26-09-18 11:52:56, Dan Williams wrote:
[...]
> Could we push the hotplug lock deeper to the places that actually need
> it? What I found with my initial investigation is that we don't even
> need the hotplug lock for the vmemmap initialization with this patch
> [1].

Yes, the scope of the hotplug lock should be evaluated and _documented_.
Then we can build on top.
-- 
Michal Hocko
SUSE Labs