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

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Message-ID: <356ef11a-02aa-4661-b8af-4c72cef5c9b5@bytedance.com>
Date: Thu, 7 Nov 2024 14:47:21 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Jann Horn <jannh@...gle.com>, 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 2024/11/6 19:28, Lorenzo Stoakes wrote:
> On Wed, Nov 06, 2024 at 10:56:29AM +0800, Qi Zheng wrote:
>>
>>
>> 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.
> 
> Thanks!
> 
> Will be respinning with all comments taken into account relatively soon.
> 
>>
>>>>
>>>> (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/
> 
> Yeah I need to read through a little bit as I was unaware of these paths (mm is
> a big and sprawling subsystem more so than one might expect... :)
> 
> Could you cc- me on any respin, as at least an interested observer? Thanks!

Sure, will cc- you in the next version. ;)

> 
>>
>>>
>>> Ugh wut OK haha. Will look into this.
>>
>> Thanks!
>>
> 
> :>)