linux-kernel - Re: [PATCH v1 00/14] Add support for shared PTEs across processes

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Message-ID: <dbd8a627-ce8d-8265-289d-30e0399a66e2@intel.com>
Date:   Mon, 11 Apr 2022 11:51:46 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Khalid Aziz <khalid.aziz@...cle.com>
Cc:     akpm@...ux-foundation.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 v1 00/14] Add support for shared PTEs across processes

On 4/11/22 10:37, Matthew Wilcox wrote:
> Another argument that MM developers find compelling is that we can reduce
> some of the complexity in hugetlbfs where it has the ability to share
> page tables between processes.

When could this complexity reduction actually happen in practice?  Can
this mshare thingy be somehow dropped in underneath the existing
hugetlbfs implementation?  Or would userspace need to change?