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Date: Mon, 14 Mar 2011 10:33:25 +0000
Message-ID: <AANLkTinnMob-816s5aZ6ptok7zwz3A8DosNd1canTBHN@mail.gmail.com>
Subject: Re: [Qemu-devel] Re: qemu-0.14.0 doesn't compile on ppc32
From: Stefan Hajnoczi <stefanha@gmail.com>
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>, nello martuscielli <ppc.addon@gmail.com>, qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>, Alexander Graf <agraf@suse.de>

On Mon, Mar 14, 2011 at 10:23 AM, Peter Maydell
<peter.maydell@linaro.org> wrote:
> On 21 February 2011 08:10, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> On 02/20/2011 06:32 PM, Peter Maydell wrote:
>>> Some of qemu's code does seem to trigger rather excessive memory
>>> use by gcc; for instance we've had problems with memory usage
>>> building for ARM with gcc of target-sparc/translate.c wanting
>>> gigabytes of RAM with some compiler flags:
>>> https://bugs.launchpad.net/gcc-linaro/+bug/714921
>>>
>>> I suspect it's all those large switch statements...
>>
>> It's on my todo list to report it to GCC, since this memory-hog behavior=
 is
>> a GCC regression.
>
> We've been working on this in Linaro, and the following two patches
> have been posted upstream:
>
> =A0 =A0http://gcc.gnu.org/ml/gcc-patches/2011-03/msg00193.html
> =A0 =A0http://gcc.gnu.org/ml/gcc-patches/2011-03/msg00255.html
>
> so you can probably cross that item off your todo list :-)

Interesting.  Alexander Graf and I recently hit an out of memory when
building translate.o on ppc64 host.  It was solved by adding more RAM
to the box but this patch looks nice too ;).

Stefan