Re: [PATCH v10 2/4] mm: memory_hotplug: override memmap_on_memory when hugetlb_free_vmemmap=on

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To: Muchun Song <songmuchun@xxxxxxxxxxxxx>, corbet@xxxxxxx, mike.kravetz@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, mcgrof@xxxxxxxxxx, keescook@xxxxxxxxxxxx, yzaikin@xxxxxxxxxx, osalvador@xxxxxxx, masahiroy@xxxxxxxxxx
Subject: Re: [PATCH v10 2/4] mm: memory_hotplug: override memmap_on_memory when hugetlb_free_vmemmap=on
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Thu, 12 May 2022 09:36:15 +0200
Cc: linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, duanxiongchun@xxxxxxxxxxxxx, smuchun@xxxxxxxxx
In-reply-to: <20220509062703.64249-3-songmuchun@bytedance.com>
Organization: Red Hat
References: <20220509062703.64249-1-songmuchun@bytedance.com> <20220509062703.64249-3-songmuchun@bytedance.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0

On 09.05.22 08:27, Muchun Song wrote:
> Optimizing HugeTLB vmemmap pages is not compatible with allocating memmap on
> hot added memory. If "hugetlb_free_vmemmap=on" and
> memory_hotplug.memmap_on_memory" are both passed on the kernel command line,
> optimizing hugetlb pages takes precedence. 

Why?


-- 
Thanks,

David / dhildenb

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References:
- [PATCH v10 0/4] add hugetlb_optimize_vmemmap sysctl
  - From: Muchun Song
- [PATCH v10 2/4] mm: memory_hotplug: override memmap_on_memory when hugetlb_free_vmemmap=on
  - From: Muchun Song

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