linux-kernel - Re: [PATCHv2 0/2] remap_file

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Message-ID: <CAMSv6X1_BzDE1ytPtdGQKK=OJJVpsPrwp2dgSZxA=A03n4rWJw@mail.gmail.com>
Date:	Mon, 12 May 2014 09:50:20 +0200
From:	Armin Rigo <arigo@...es.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	peterz@...radead.org, mingo@...nel.org
Subject: Re: [PATCHv2 0/2] remap_file_pages() decommission

Hi Andi,

On 12 May 2014 05:36, Andi Kleen <andi@...stfloor.org> wrote:
>> Here is a note from the PyPy project (mentioned earlier in this
>> thread, and at https://lwn.net/Articles/587923/ ).
>
> Your use is completely bogus. remap_file_pages() pins everything
> and disables any swapping for the area.

? No.  Trying this example: http://bpaste.net/show/fCUTnR9mDzJ2IEKrQLAR/

...really allocates 4GB of RAM, and on a 4GB machine it causes some
swapping.  It seems to work fine.  I'm not sure to understand you.
I'm also not sure that a property as essential as "disables swapping"
should be omitted from the man page; if so, that would be a real man
page bug.


A bientôt,

Armin.
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