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

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Message-ID: <ad882462-0ae9-4ca7-bbf7-7728de71c422@lucifer.local>
Date: Wed, 6 Nov 2024 11:28:08 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Qi Zheng <zhengqi.arch@...edance.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 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!

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

:>)