linux-kernel - Re: [DISCUSSION] Unconditionally lock folios when calling rmap

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Message-ID: <cc185893-dd85-4571-9d0f-23ca3b8762df@lucifer.local>
Date: Thu, 28 Aug 2025 12:32:12 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Harry Yoo <harry.yoo@...cle.com>
Cc: Lokesh Gidra <lokeshgidra@...gle.com>, Zi Yan <ziy@...dia.com>,
        Barry Song <21cnbao@...il.com>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        Peter Xu <peterx@...hat.com>, Suren Baghdasaryan <surenb@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        android-mm <android-mm@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jann Horn <jannh@...gle.com>, Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [DISCUSSION] Unconditionally lock folios when calling rmap_walk()

On Mon, Aug 25, 2025 at 07:52:10PM +0900, Harry Yoo wrote:
> Adding folio_lock/unlock in folio_referenced() is likely to affect
> reclamation performance. How bad is it? I don't know, need data.
>
> And adding cost only for the uffd case might not be justifiable...

Exactly.