linux-kernel - Re: [RFC PATCH 0/3] Allocate memmap from hotadded memory (per device)

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Message-ID: <259889fb-f01b-9537-7948-f1a75a372617@oracle.com>
Date:   Wed, 28 Oct 2020 11:47:57 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>
Cc:     mhocko@...nel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, vbabka@...e.cz, pasha.tatashin@...een.com
Subject: Re: [RFC PATCH 0/3] Allocate memmap from hotadded memory (per device)

On 10/27/20 8:58 AM, Oscar Salvador wrote:
> On Tue, Oct 27, 2020 at 04:44:33PM +0100, David Hildenbrand wrote:
>> I'm planning on looking into patch #2/3 later this or next week (this week
>> is open source summit / KVM Forum).
> 
> Sure, aprecciated the time ;-)
> 
>>
>> One thing to look into right now is how to make this fly this with vmemmap
>> optimizations for hugetlb pages.
>>
>> https://lkml.kernel.org/r/20201026145114.59424-1-songmuchun@bytedance.com
> 
> I was about to have a look at that series eitherway, but good you mentioned.
> 

More eyes on that series would be appreciated.

That series will dynamically free and allocate memmap pages as hugetlb
pages are allocated or freed.  I haven't looked through this series, but
my first thought is that we would need to ensure those allocs/frees are
directed to the device.  Not sure if there are interfaces for that.
-- 
Mike Kravetz