linux-kernel - Re: [PATCH v2 0/9] Add support for shared PTEs across processes

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Message-Id: <20220701212403.77ab8139b6e1aca87fae119e@linux-foundation.org>
Date:   Fri, 1 Jul 2022 21:24:03 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     willy@...radead.org, aneesh.kumar@...ux.ibm.com, arnd@...db.de,
        21cnbao@...il.com, corbet@....net, dave.hansen@...ux.intel.com,
        david@...hat.com, ebiederm@...ssion.com, hagen@...u.net,
        jack@...e.cz, keescook@...omium.org, kirill@...temov.name,
        kucharsk@...il.com, linkinjeon@...nel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, longpeng2@...wei.com, luto@...nel.org,
        markhemm@...glemail.com, pcc@...gle.com, rppt@...nel.org,
        sieberf@...zon.com, sjpark@...zon.de, surenb@...gle.com,
        tst@...oebel-theuer.de, yzaikin@...gle.com
Subject: Re: [PATCH v2 0/9] Add support for shared PTEs across processes

On Wed, 29 Jun 2022 16:53:51 -0600 Khalid Aziz <khalid.aziz@...cle.com> wrote:

> This patch series implements a mechanism in kernel to allow
> userspace processes to opt into sharing PTEs. It adds a new
> in-memory filesystem - msharefs. 

Dumb question: why do we need a new filesystem for this?  Is it not
feasible to permit PTE sharing for mmaps of tmpfs/xfs/ext4/etc files?