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Date: Tue, 18 Nov 2025 09:33:48 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
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>, Zi Yan <ziy@nvidia.com>, Baolin Wang
 <baolin.wang@linux.alibaba.com>, Nico Pache <npache@redhat.com>, Ryan
 Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>, Barry Song
 <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
 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 v4 0/9] introduce VM_MAYBE_GUARD and make it sticky
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On Tue, 18 Nov 2025 10:17:42 +0000 Lorenzo Stoakes <lorenzo.stoakes@oracle.com> wrote:

> Currently, guard regions are not visible to users except through
> /proc/$pid/pagemap, with no explicit visibility at the VMA level.
> 
> This makes the feature less useful, as it isn't entirely apparent which
> VMAs may have these entries present, especially when performing actions
> which walk through memory regions such as those performed by CRIU.
> 
> This series addresses this issue by introducing the VM_MAYBE_GUARD flag
> which fulfils this role, updating the smaps logic to display an entry for
> these.

I updated mm-unstable to this version.