linux-kernel - Re: remap_file

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Message-ID: <CAFLxGvwhNE9rRn2k=HgT7UYWyQzAkfKdON=LCcXPvXbOJ80pFQ@mail.gmail.com>
Date:	Mon, 19 May 2014 21:14:29 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Kenny Simpson <theonetruekenny@...il.com>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	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

On Mon, May 19, 2014 at 5:17 PM, Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
> Christoph Hellwig wrote:
>> On Mon, May 19, 2014 at 06:02:38PM +0300, Kirill A. Shutemov wrote:
>> > > Stop right there.  We found out about two real life users of
>> > > remap_file_pages() already, without even committing the patches to warn
>> > > about using it to any tree.
>> >
>> > Who is the second here?     Oracle?
>>
>> PyPy.
>>
>> Oracle would be the third, although use of the feature is optional and
>> fairly hard to opt in to, so I didn't count it.
>
> IIUC PyPy uses the syscall in some early prototype and looks like guys are
> okay to rework it to mmap() if default sysctl_max_map_count will be high
> enough.

A quick search on github exposed three more users:
https://github.com/LotharSchwab/R-Framework
https://github.com/const86/glgrab
https://github.com/minimoog/virtualringbuffer

-- 
Thanks,
//richard
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