Re: [LSF/MM/BPF TOPIC] mshare - sharing page tables across processes

[Pedro Falcato <pfalcato@suse.de>]

On Mon, Feb 23, 2026 at 06:11:49PM -0800, anthony.yznaga@oracle.com wrote:
> mshare is a new form of shared memory that shares resources between
> processes, namely the page tables entries and VMAs of the shared objects.
> Advantages include reduced memory consumption through eliminating the need
> for duplicated PTEs in each process, reduced overhead needed to fault shared
> pages into multiple processes, and the ability for updates to the memory
> such as protection changes to be immdediately visible to all sharing
> processes.
> 
> For some time now the proposed API has continued to evolve. With feedback
> from mm maintainers, a new approach using syscalls is being taken to create,
> attach, and deattach mshare regions and to map and manipulate the memory
> objects within a region.
> 
> Let's discuss the current state of the API and technical challenges of
> managing and accomodating shared page tables in the kernel.
>

Hi Anthony,

As always, would love to talk about this in person :) 

-- 
Pedro