From: Randy Dunlap <rdunlap@infradead.org>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>,
David Hildenbrand <david@redhat.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Jann Horn <jannh@google.com>, Pedro Falcato <pfalcato@suse.de>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-doc@vger.kernel.org, linux-mm@kvack.org,
linux-trace-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org, Andrei Vagin <avagin@gmail.com>
Subject: Re: [PATCH 1/3] mm: introduce VM_MAYBE_GUARD and make visible for guard regions
Date: Wed, 29 Oct 2025 12:50:18 -0700 [thread overview]
Message-ID: <6c273611-e815-4a4a-822d-f6e55cec3810@infradead.org> (raw)
In-Reply-To: <7de40603015dee82970f5d37332a6d5af7532063.1761756437.git.lorenzo.stoakes@oracle.com>
On 10/29/25 9:50 AM, Lorenzo Stoakes wrote:
> diff --git a/mm/memory.c b/mm/memory.c
> index 4c3a7e09a159..a2c79ee43d68 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -1478,6 +1478,10 @@ vma_needs_copy(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma)
> if (src_vma->anon_vma)
> return true;
>
> + /* Guard regions have momdified page tables that require copying. */
modified
> + if (src_vma->vm_flags & VM_MAYBE_GUARD)
> + return true;
> +
> /*
> * Don't copy ptes where a page fault will fill them correctly. Fork
> * becomes much lighter when there are big shared or private readonly
--
~Randy
next prev parent reply other threads:[~2025-10-29 19:50 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-29 16:50 [PATCH 0/3] introduce VM_MAYBE_GUARD and make it sticky Lorenzo Stoakes
2025-10-29 16:50 ` [PATCH 1/3] mm: introduce VM_MAYBE_GUARD and make visible for guard regions Lorenzo Stoakes
2025-10-29 19:50 ` Randy Dunlap [this message]
2025-10-30 8:13 ` Lorenzo Stoakes
2025-10-30 1:05 ` Suren Baghdasaryan
2025-10-30 8:22 ` Lorenzo Stoakes
2025-10-30 16:16 ` Pedro Falcato
2025-10-30 16:23 ` Lorenzo Stoakes
2025-10-30 16:31 ` Pedro Falcato
2025-10-30 16:43 ` Lorenzo Stoakes
2025-10-30 18:31 ` Vlastimil Babka
2025-10-30 18:47 ` Vlastimil Babka
2025-10-30 19:47 ` Lorenzo Stoakes
2025-10-30 21:48 ` Vlastimil Babka
2025-10-31 23:12 ` Suren Baghdasaryan
2025-11-03 9:34 ` Lorenzo Stoakes
2025-11-05 19:48 ` Lorenzo Stoakes
2025-11-06 7:34 ` Vlastimil Babka
2025-10-30 19:16 ` Lorenzo Stoakes
2025-10-30 19:37 ` Lorenzo Stoakes
2025-10-29 16:50 ` [PATCH 2/3] mm: implement sticky, copy on fork VMA flags Lorenzo Stoakes
2025-10-30 4:35 ` Suren Baghdasaryan
2025-10-30 8:25 ` Lorenzo Stoakes
2025-10-30 16:25 ` Pedro Falcato
2025-10-30 16:34 ` Lorenzo Stoakes
2025-10-29 16:50 ` [PATCH 3/3] selftests/mm/guard-regions: add smaps visibility test Lorenzo Stoakes
2025-10-30 4:40 ` Suren Baghdasaryan
2025-10-30 8:25 ` Lorenzo Stoakes
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