From: Bagas Sanjaya <bagasdotme@gmail.com>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
Alice Ryhl <aliceryhl@google.com>,
Boqun Feng <boqun.feng@gmail.com>,
Matthew Wilcox <willy@infradead.org>,
Mike Rapoport <rppt@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, Suren Baghdasaryan <surenb@google.com>,
Hillf Danton <hdanton@sina.com>,
Qi Zheng <zhengqi.arch@bytedance.com>,
SeongJae Park <sj@kernel.org>
Subject: Re: [PATCH] docs/mm: add VMA locks documentation
Date: Tue, 12 Nov 2024 08:12:52 +0700 [thread overview]
Message-ID: <ZzKrlEAjzZ80M0ik@archie.me> (raw)
In-Reply-To: <0d540192-3372-48ff-99fc-e8bfb960e3bf@lucifer.local>
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On Fri, Nov 08, 2024 at 12:34:23PM +0000, Lorenzo Stoakes wrote:
> On Fri, Nov 08, 2024 at 12:29:15PM +0000, Lorenzo Stoakes wrote:
> > On Fri, Nov 08, 2024 at 07:25:38PM +0700, Bagas Sanjaya wrote:
> > > On Thu, Nov 07, 2024 at 07:01:37PM +0000, Lorenzo Stoakes wrote:
> > > > +.. note:: In instances where the architecture supports fewer page tables than
> > > > + five the kernel cleverly 'folds' page table levels, that is skips them within
> > > > + the logic, regardless we can act as if there were always five.
> > >
> > > What are being skipped if e.g. we only have 3 or 4 page tables?
> > >
> > > Confused...
> >
> > Page table levels, see [0].
> >
> > Typically achieved through stubbing functions out, etc. So in the code you
> > actually write and _conceptually_ there are five levels, only in the final
> > compile you might have things like p4d_present(), p4d_clear() etc. squashed by
> > the compiler into nothing.
>
> I have updated this note to be a little clearer and to explicitly state
> this. Thanks!
Thanks for clarifying.
--
An old man doll... just what I always wanted! - Clara
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next prev parent reply other threads:[~2024-11-12 1:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-07 19:01 Lorenzo Stoakes
2024-11-07 21:15 ` Jann Horn
2024-11-08 10:35 ` Lorenzo Stoakes
2024-11-08 8:26 ` Kirill A. Shutemov
2024-11-08 8:59 ` Lorenzo Stoakes
2024-11-08 12:25 ` Bagas Sanjaya
2024-11-08 12:29 ` Lorenzo Stoakes
2024-11-08 12:34 ` Lorenzo Stoakes
2024-11-12 1:12 ` Bagas Sanjaya [this message]
2024-11-11 2:42 ` Wei Yang
2024-11-11 10:31 ` Lorenzo Stoakes
2024-11-11 7:07 ` Wei Yang
2024-11-11 10:39 ` Lorenzo Stoakes
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