From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>,
Mikhail Zaslonko <zaslonko@linux.ibm.com>,
akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Pavel.Tatashin@microsoft.com,
schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com
Subject: Re: [PATCH v2 1/1] mm, memory_hotplug: Initialize struct pages for the full memory section
Date: Mon, 17 Dec 2018 14:35:16 +0100 [thread overview]
Message-ID: <20181217133516.GO30879@dhcp22.suse.cz> (raw)
In-Reply-To: <8b1bc4ff-0a30-573c-94c3-a8d943cd291c@redhat.com>
On Mon 17-12-18 14:29:04, David Hildenbrand wrote:
> On 17.12.18 13:28, Michal Hocko wrote:
> > On Mon 17-12-18 10:38:32, David Hildenbrand wrote:
> > [...]
> >> I am wondering if we should fix this on the memblock level instead than.
> >> Something like, before handing memory over to the page allocator, add
> >> memory as reserved up to the last section boundary. Or even when setting
> >> the physical memory limit (mem= scenario).
> >
> > Memory initialization is spread over several places and that makes it
> > really hard to grasp and maintain. I do not really see why we should
> > make memblock even more special. We do intialize the section worth of
> > memory here so it sounds like a proper place to quirk for incomplete
> > sections.
> >
>
> True as well. The reason I am asking is, that memblock usually takes
> care of physical memory holes.
Yes and no. It only reflects existing memory ranges (so yes it skips
over holes) and then it provides an API that platform/arch code can
abuse to cut holes into existing ranges.
--
Michal Hocko
SUSE Labs
prev parent reply other threads:[~2018-12-17 13:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 17:27 [PATCH v2 0/1] Initialize struct pages for the full section Mikhail Zaslonko
2018-12-12 17:27 ` [PATCH v2 1/1] mm, memory_hotplug: Initialize struct pages for the full memory section Mikhail Zaslonko
2018-12-13 3:46 ` Wei Yang
[not found] ` <e4cebbae-3fcb-f03c-3d0e-a1a44ff0675a@linux.bm.com>
2018-12-13 15:12 ` Wei Yang
[not found] ` <674c53e2-e4b3-f21f-4613-b149acef7e53@linux.bm.com>
2018-12-14 10:19 ` Michal Hocko
2018-12-15 0:26 ` Wei Yang
2018-12-13 12:59 ` Michal Hocko
2018-12-14 15:22 ` David Hildenbrand
2018-12-14 15:49 ` David Hildenbrand
2018-12-14 19:23 ` Gerald Schaefer
2018-12-17 9:38 ` David Hildenbrand
2018-12-17 12:28 ` Michal Hocko
2018-12-17 13:29 ` David Hildenbrand
2018-12-17 13:35 ` Michal Hocko [this message]
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