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

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Message-ID: <CA+EESO5nE4uLhqgGaGTbSf_ke+TnZjw+ijJqys6omNpaaEF9Lg@mail.gmail.com>
Date: Fri, 22 Aug 2025 10:16:28 -0700
From: Lokesh Gidra <lokeshgidra@...gle.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Harry Yoo <harry.yoo@...cle.com>, Zi Yan <ziy@...dia.com>, Barry Song <21cnbao@...il.com>, 
	"open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>, Peter Xu <peterx@...hat.com>, 
	David Hildenbrand <david@...hat.com>, Suren Baghdasaryan <surenb@...gle.com>, 
	Kalesh Singh <kaleshsingh@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	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>
Subject: Re: [RFC] Unconditionally lock folios when calling rmap_walk()

On Fri, Aug 22, 2025 at 3:50 AM Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
>
> Lokesh, this is a mess :/
>
> I've been a reverse mapping co-maintainer for 4 months now, please check
> MAINTAINERS before sending this stuff out. It's not really impressive to
> learn about this 2nd hand...
>
> Also I cannot get lei to get this mail to me, no matter how hard I try. So
> it's _really hard_ for me to respond to this.
>
> And you label this '[RFC]' but I can't find any code (unless it's lost in
> the thread somehow). It should be '[DISCUSSION]'.
>
> rmap locking is _extremely_ sensitive and the discussion needs careful
> attention.
>
> It's hard for me to even track what's going on here or join the discussion,
> could you just please resend, correctly cc'ing the maintainers/reviewers of
> rmap, and prefix with '[DISCUSSION]'?

Sincere apologies. I'll resend correcting both the mistakes.
>
> You've already got responses here so we're inevitably going to fork the
> conversation, but unfortunately I don't see any way around this, because
> I'm going to miss all the conversation that I'm not cc'd on.
>
> Anwyay I simply can't engage on this as-is, and I really _want to_, because
> rmap and the locking around it are issues of PRIMARY importance to me.
>
> Please try to make my life easier :)
>
> Thanks, Lorenzo