linux-kernel - Re: [RFC PATCH 2/3] hugetlb: convert page_huge

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Message-ID: <d38c9342-2544-0a0d-c905-2f81af105dac@oracle.com>
Date:   Fri, 15 Jan 2021 13:25:09 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michal Hocko <mhocko@...nel.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Muchun Song <songmuchun@...edance.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 2/3] hugetlb: convert page_huge_active() to
 HPageMigratable flag

On 1/15/21 12:29 PM, Oscar Salvador wrote:
> 
> About that alloc_contig_range topic, I would like to take a look unless
> someone is already on it or about to be.
> 
> Thanks Mike for the time ;-)

Feel free.

My first thought is that migration of a free hugetlb page would need to
be something like:
1) allocate a fresh hugetlb page from buddy
2) free the 'migrated' free huge page back to buddy

I do not think we can use the existing 'isolate-migrate' flow.  Isolating
a page would make it unavailable for allocation and that could cause
application issues.  

-- 
Mike Kravetz