linux-kernel - Re: [PATCH 01/11] mm/mremap: introduce more mergeable mremap via MREMAP_RELOCATE

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Message-ID: <cd942b04-f655-43bc-a238-68266d21ecf9@redhat.com>
Date: Tue, 17 Jun 2025 12:01:22 +0200
From: David Hildenbrand <david@...hat.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Harry Yoo <harry.yoo@...cle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Suren Baghdasaryan <surenb@...gle.com>, Matthew Wilcox
 <willy@...radead.org>, Pedro Falcato <pfalcato@...e.de>,
 Rik van Riel <riel@...riel.com>, Zi Yan <ziy@...dia.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Nico Pache <npache@...hat.com>,
 Ryan Roberts <ryan.roberts@....com>, Dev Jain <dev.jain@....com>,
 Jakub Matena <matenajakub@...il.com>, Wei Yang <richard.weiyang@...il.com>,
 Barry Song <baohua@...nel.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] mm/mremap: introduce more mergeable mremap via
 MREMAP_RELOCATE_ANON

>>> I really wish we can find a way to not require the fallback.
>>
>> Maybe split the VMA at the point where it fails, instead of undo?
> 
> I don't think this is actually possible without major rework as we've separated
> the VMA and folio, page table parts of the operation.
> 
> Let me put thoughts on this in reply to David so we don't split conversation
> (pun intended ;) I think we have other options also.

:)

I'm still trying to wrap my head around alternatives, and possible 
simplifications ... oh my is this all complicated.

-- 
Cheers,

David / dhildenb