linux-kernel - Re: [RFC PATCH] docs/mm: add VMA locks documentation

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Message-ID: <441f3ae8-1e8a-42be-9f65-54ccf58e3fa3@lucifer.local>
Date: Tue, 5 Nov 2024 14:18:01 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Matthew Wilcox <willy@...radead.org>, Mike Rapoport <rppt@...nel.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Suren Baghdasaryan <surenb@...gle.com>, linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH] docs/mm: add VMA locks documentation

On Tue, Nov 05, 2024 at 02:56:43PM +0100, Alice Ryhl wrote:
[snip]
> >
> > As a wordy aside, a large part of the motivation of this document, or
> > certainly my prioritisation of it, is explicitly to help the rust team
> > correctly abstract this aspect of mm.
> >
> > The other part is to help the mm team, that is especailly myself, correctly
> > understand and _remember_ the numerous painful ins and outs of this stuff,
> > much of which has been pertinent of late for not wonderfully positive
> > reasons.
> >
> > Hopefully we accomplish both! :>)
>
> I do think this has revealed one issue with my Rust patch, which is
> that VmAreaMut currently requires the mmap lock, but it should also
> require the vma lock, since you need both for writing.
>
> Alice

Awesome :) I am genuinely hoping this doc will aid you guys in rust in
general.

And maybe I can use advent of code this year to actually learn the language
myself...

I nominate Vlasta to join me ;)