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Message-ID: <49107D98.9080201@gmail.com>
Date: Tue, 04 Nov 2008 18:51:36 +0200
From: "Eugene V. Lyubimkin" <jackyf.devel@gmail.com>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
CC: Peter Zijlstra <peterz@infradead.org>, Chris Friesen <cfriesen@nortel.com>,
       Rik van Riel <riel@redhat.com>, linux-kernel@vger.kernel.org,
       linux-mm <linux-mm@kvack.org>, hugh <hugh@veritas.com>
Subject: Re: mmap: is default non-populating behavior stable?
References: <490F73CD.4010705@gmail.com>	<1225752083.7803.1644.camel@twins>	<490F8005.9020708@redhat.com>	<491070B5.2060209@nortel.com>	<1225814820.7803.1672.camel@twins> <20081104162820.644b1487@lxorguk.ukuu.org.uk>
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Alan Cox wrote:
> On Tue, 04 Nov 2008 17:07:00 +0100
> Peter Zijlstra <peterz@infradead.org> wrote:
>> [snip]
>> I'm not sure how POSIX speaks of this.
>>
>> I think Linux does the expected thing.
>=20
> I believe our behaviour is correct for mmap/mumap/truncate and it
> certainly used to be and was tested.
>=20
> At the point you do anything involving mremap (which is non posix) our
> behaviour becomes rather bizarre.

Thanks to all for answers. I have made the conclusion that doing "open() =
new
file, truncate(<big size>), mmap(<the same big size>), write/read some me=
mory
pages" should not populate other, untouched by write/read pages (until
MAP_POPULATE given), right?

--=20
Eugene V. Lyubimkin aka JackYF


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