linux-kernel - Re: remap_file

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Message-Id: <20140519151758.A2162E009B@blue.fi.intel.com>
Date:	Mon, 19 May 2014 18:17:58 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Kenny Simpson <theonetruekenny@...il.com>,
	Michal Hocko <mhocko@...e.cz>, 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

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.

-- 
 Kirill A. Shutemov
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