linux-kernel - Re: RFC for new feature to move pages from one vma to another without split

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Message-ID: <ZDghhTH2KtCeAwcZ@x1n>
Date:   Thu, 13 Apr 2023 11:36:37 -0400
From:   Peter Xu <peterx@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Lokesh Gidra <lokeshgidra@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Brian Geffon <bgeffon@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Nicolas Geoffray <ngeoffray@...gle.com>,
        Jared Duke <jdduke@...gle.com>,
        android-mm <android-mm@...gle.com>,
        Blake Caldwell <blake.caldwell@...orado.edu>,
        Mike Rapoport <rppt@...nel.org>
Subject: Re: RFC for new feature to move pages from one vma to another
 without split

On Thu, Apr 13, 2023 at 10:10:44AM +0200, David Hildenbrand wrote:
> So instead, we consider the whole address space as a virtual, anon file,
> starting at offset 0. The pgoff of a VMA is then simply the offset in that
> virtual file (easily computed from the start of the VMA), and VMA merging is
> just the same as for an ordinary file.

Interesting point, thanks!

-- 
Peter Xu