linux-kernel - Re: remap_file

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Message-ID: <20140519130114.GA3140@dhcp22.suse.cz>
Date:	Mon, 19 May 2014 15:01:14 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Kenny Simpson <theonetruekenny@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Armin Rigo <arigo@...es.org>
Subject: Re: remap_file_pages() use

[CCing Kirill and other people involved]

On Sun 18-05-14 00:03:28, Kenny Simpson wrote:
> I saw that remap_file_pages() was possibly going away to be replaced
> by some emulation. I've used this call in several projects over the
> years mostly as a way of mapping multiple virtual memory pages to
> alias the same private or shared memory region (to do things like
> circular buffers). mmap()
> in the case of anonymous memory doesn't work as well since there is
> not a file descriptor to reference.
> 
> Would this sort of thing be supported in the emulation, or should I be
> planning on reimplementing/rewriting some things?
> 
> thanks,
> -Kenny
> --
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-- 
Michal Hocko
SUSE Labs
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