From owner-freebsd-emulation@FreeBSD.ORG  Tue Mar 30 20:33:16 2010
Return-Path: <owner-freebsd-emulation@FreeBSD.ORG>
Delivered-To: freebsd-emulation@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 5155D106567A
	for <freebsd-emulation@freebsd.org>;
	Tue, 30 Mar 2010 20:33:16 +0000 (UTC) (envelope-from rth@twiddle.net)
Received: from are.twiddle.net (are.twiddle.net [75.149.56.221])
	by mx1.freebsd.org (Postfix) with ESMTP id 3783F8FC0A
	for <freebsd-emulation@freebsd.org>;
	Tue, 30 Mar 2010 20:33:15 +0000 (UTC)
Received: from anchor.twiddle.home (anchor.twiddle.home [172.31.0.4])
	by are.twiddle.net (Postfix) with ESMTPSA id A2875431;
	Tue, 30 Mar 2010 13:33:15 -0700 (PDT)
Message-ID: <4BB2600B.90002@twiddle.net>
Date: Tue, 30 Mar 2010 13:33:15 -0700
From: Richard Henderson <rth@twiddle.net>
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US;
	rv:1.9.1.8) Gecko/20100301 Fedora/3.0.3-1.fc12 Thunderbird/3.0.3
MIME-Version: 1.0
To: Juergen Lock <nox@jelal.kn-bremen.de>
References: <20100325204423.GA46954@triton8.kn-bremen.de>	<f43fc5581003301104x77c0e527m871b035a7364bd5b@mail.gmail.com>	<20100330191629.GA95521@triton8.kn-bremen.de>
	<201003302009.o2UK9lAv002282@triton8.kn-bremen.de>
In-Reply-To: <201003302009.o2UK9lAv002282@triton8.kn-bremen.de>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Cc: Blue Swirl <blauwirbel@gmail.com>, freebsd-emulation@freebsd.org,
	Toni <tonygio04@gmail.com>, qemu-devel@nongnu.org,
	Andreas Tobler <andreast@fgznet.ch>
Subject: Re: [Qemu-devel] qemu git head 20100323 on FreeBSD - qemu-devel	
 port update for testing
X-BeenThere: freebsd-emulation@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Development of Emulators of other operating systems
	<freebsd-emulation.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-emulation>, 
	<mailto:freebsd-emulation-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-emulation>
List-Post: <mailto:freebsd-emulation@freebsd.org>
List-Help: <mailto:freebsd-emulation-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-emulation>, 
	<mailto:freebsd-emulation-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 30 Mar 2010 20:33:16 -0000

On 03/30/2010 01:09 PM, Juergen Lock wrote:
> Oh sorry if that was not clear, things go into swap if I _replace_ the
> endaddr ~0ul (which caused the assert) with the max value the assert
> still tolerates i.e.
> 	((abi_ulong)1 << L1_MAP_ADDR_SPACE_BITS) - 1
> which in this case seems to be 0x7fffffffffff:

Yes, I got that.  And I see from ...

> #3  0x0000000060012731 in page_set_flags (start=140737488224256, 
>     end=18446744073709551615, flags=32)

... here that the range we're reserving is

  0x7ffffffe0000 ... 0x7fffffffffff

which is a mere 128k range.  Which ought to allocate no more than
a single leaf page table (and thus N-1 pages for the N-level table).

Which doesn't answer the question of why you'd wind up running out
of memory.


r~