linux-kernel - Re: [PATCHv2 2/3] i915: convert to new mount API

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Date:   Wed, 7 Aug 2019 08:30:02 +0200
From:   Christoph Hellwig <hch@....de>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        David Howells <dhowells@...hat.com>,
        Christoph Hellwig <hch@....de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCHv2 2/3] i915: convert to new mount API

On Tue, Aug 06, 2019 at 12:50:10AM -0700, Hugh Dickins wrote:
> Though personally I'm averse to managing "f"objects through
> "m"interfaces, which can get ridiculous (notably, MADV_HUGEPAGE works
> on the virtual address of a mapping, but the huge-or-not alignment of
> that mapping must have been decided previously).  In Google we do use
> fcntls F_HUGEPAGE and F_NOHUGEPAGE to override on a per-file basis -
> one day I'll get to upstreaming those.

Such an interface seems very useful, although the two fcntls seem a bit
odd.

But I think the point here is that the i915 has its own somewhat odd
instance of tmpfs.  If we could pass the equivalent of the huge=*
options to shmem_file_setup all that garbage (including the
shmem_file_setup_with_mnt function) could go away.