From: robherring2@gmail.com (Rob Herring)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/2] ARM: topdown mmap support
Date: Wed, 24 Oct 2012 07:39:53 -0500 [thread overview]
Message-ID: <5087E199.4050704@gmail.com> (raw)
In-Reply-To: <CAMj5Bkg9Ht4YG9TL4yQfT5y5Fea4ywLDANoO2NTnGJZatN2RLQ@mail.gmail.com>
On 10/24/2012 07:22 AM, zhangfei gao wrote:
> On Fri, Nov 18, 2011 at 5:47 AM, Rob Herring <robherring2@gmail.com> wrote:
>> From: Rob Herring <rob.herring@calxeda.com>
>>
>> Similar to other architectures, this adds topdown mmap support in user
>> process address space allocation policy. This allows mmap sizes greater
>> than 2GB. This support is largely copied from MIPS and the generic
>> implementations.
>>
>> The address space randomization is moved into arch_pick_mmap_layout.
>>
>> Tested on V-Express with ubuntu and a mmap test from here:
>> https://bugs.launchpad.net/bugs/861296
>>
>> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
>> Acked-by: Nicolas Pitre <nico@linaro.org>
>
> Unfortunately, we met "no vspace available" during loading libmono.so,
> when using default arch_get_unmapped_area_topdown method, tested on
> Jelly Bean with 3.4 kernel.
> While no problem using arch_get_unmapped_area in the patch, or just
> revert this patch.
> The result is some application can not run.
>
> Just google, find same issue reported on Jelly Bean with 3.4 kernel.
>
> Any suggestion?
Perhaps Android has hardcoded expectations about the virtual memory
layout? I was worried about that at the time and asked the Linaro
Android folks to test it.
I believe either layout can be selected at runtime per process. I don't
recall the exact /proc file to control this.
Rob
next prev parent reply other threads:[~2012-10-24 12:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-17 21:47 [PATCH v2 1/2] ARM: use cache type functions for arch_get_unmapped_area Rob Herring
2011-11-17 21:47 ` [PATCH v2 2/2] ARM: topdown mmap support Rob Herring
2011-11-22 3:05 ` Rob Herring
2011-11-22 3:44 ` Nicolas Pitre
2012-10-24 12:22 ` zhangfei gao
2012-10-24 12:39 ` Rob Herring [this message]
2011-11-17 22:37 ` [PATCH v2 1/2] ARM: use cache type functions for arch_get_unmapped_area Will Deacon
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