linux-kernel - Re: [PATCH v2] mm: Add MREMAP

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Message-ID: <CADyq12xgnVByYOkL=GcszYYKzDpg254QEOFoW8=e1y=bmOCcFQ@mail.gmail.com>
Date:   Sun, 2 Feb 2020 05:17:53 +0100
From:   Brian Geffon <bgeffon@...gle.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>, linux-api@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Sonny Rao <sonnyrao@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Yu Zhao <yuzhao@...gle.com>, Jesse Barnes <jsbarnes@...gle.com>
Subject: Re: [PATCH v2] mm: Add MREMAP_DONTUNMAP to mremap().

On Wed, Jan 29, 2020 at 11:46 AM Kirill A. Shutemov
<kirill@...temov.name> wrote:
> Any better options for the flag name? (I have none)

The other option is that it's broken up into two new flags the first
MREMAP_MUSTMOVE which can be used regardless of whether or not you're
leaving the original mapping mapped. This would do exactly what it
describes: move the mapping to a new address with or without
MREMAP_FIXED, this keeps consistency with MAYMOVE.

The second flag would be the new MREMAP_DONTUNMAP flag which requires
MREMAP_MUSTMOVE, again with or without MREMAP_FIXED.

What are your thoughts on this?