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

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Message-ID: <5969f498-a515-4394-a2b6-5d3abe2872aa@bytedance.com>
Date: Wed, 6 Nov 2024 10:56:29 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Jann Horn <jannh@...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>, Alice Ryhl <aliceryhl@...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>,
 "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [RFC PATCH] docs/mm: add VMA locks documentation

On 2024/11/5 00:42, Lorenzo Stoakes wrote:
> On Sat, Nov 02, 2024 at 02:45:35AM +0100, Jann Horn wrote:
>> On Fri, Nov 1, 2024 at 7:50 PM Lorenzo Stoakes

[...]

>>> +
>>> +Page table locks
>>> +----------------

Many thanks to Lorenzo for documenting page table locks! This is really
needed. And at a glance, I agree with Jann's additions.

>>
>> (except last-level page tables: khugepaged already deletes those for
>> file mappings without using the mmap lock at all in
>> retract_page_tables(), and there is a pending series that will do the
>> same with page tables in other VMAs too, see
>> <https://lore.kernel.org/all/cover.1729157502.git.zhengqi.arch@bytedance.com/>)

Thanks to Jann for mentioning this series, I just updated it to v2
recently:

https://lore.kernel.org/lkml/cover.1730360798.git.zhengqi.arch@bytedance.com/

> 
> Ugh wut OK haha. Will look into this.

Thanks!