Re: Regarding systemtap support for AArch64

[Sandeepa Prabhu <sandeepa.prabhu@linaro.org>]

Hi Will,

Thanks for the details, so we have 2 more options (qemu and uefi
image) to try out. I would get back to you once tried out the options,
and then decide what's best for kprobes <-> systemtap validation.
Bit of challenge for me is that I have Ubuntu host - running yum upon
that!,  not sure of any cross-development issues, but as for aarch64
native building(on fc19-aarch64 model itself) this should be okay
though its very slow.

Thanks,
Sandeepa



On 15 October 2013 02:51, William Cohen <wcohen@redhat.com> wrote:
> On 10/14/2013 12:38 PM, William Cohen wrote:
>> On 10/08/2013 12:39 AM, Sandeepa Prabhu wrote:
>>> On 8 October 2013 09:58, Sandeepa Prabhu <sandeepa.prabhu@linaro.org> wrote:
>>>>>
>>>>> Hi Sandeepa,
>>>>>
>>>>> The fedora 19 work is publicly available.  The following page talks about setting things up:
>>>>>
>>>>> http://fedoraproject.org/wiki/Architectures/ARM/AArch64/QuickStart
>>>>>
>>>>> -Will
>>>> Hi Will,
>>>>
>>>> Thanks, I could get the console, but very slow.  Where can I look for
>>>> kernel sources and the systemtap packages? Wanted to try my kernel
>>>> changes on this and experiment systemtap, I can clone and create
>>>> kernel devel branch on linaro git for kprobes, if this work out well.
>>>>
>>> This is single CPU version, has it been tested on 4-core models
>>> (RTSM)? Responsiveness might improve with 4-core model [atleast LAMP
>>> stack run faster]
>>>
>>>> Thanks,
>>>> Sandeepa
>
> Hi Sandeepa,
>
> There is a new fedora image which uses uefi to boot just announce today.  This might be a bit easier to use use that the older image.  The following URL mentions it:
>
> https://lists.fedoraproject.org/pipermail/arm/2013-October/006964.html
>
> -Will
>>
>> Hi Sandeepa,
>>
>> Yes, the Foundation model is very slow.  I have read that there has been some work to get aarch64 support in qemu, but I have not personally tried it:
>>
>> http://news.opensuse.org/2013/10/01/suse-speeds-up-building-aarch64-software-in-qemu/
>>
>> For systemtap your best bet is to use a git clone which has the current aarch64 patches:
>>
>> git clone git://sourceware.org/git/systemtap.git
>>
>> Then build (you may need to do a "yum-builddep systemtap" as root to pull in dependencies that systemtap needs to build):
>>
>> cd systemtap
>> ./configure --disable-docs
>> make
>> make install
>>
>> At this point should have a systemtap that will build stuff for aarch64
>>
>> For the current state of aarch64 package you can look at what is in http://arm-temp.ausil.us/pub/fedora-arm/stage4/
>> Each of the packages is in a subdirectory.  You should be able to do something like the following to get the sources:
>>
>> wget http://arm-temp.ausil.us/pub/fedora-arm/stage4/kernel-3.12.0-0.rc4.git0.1.x2.fc19/kernel-3.12.0-0.rc4.git0.1.x2.fc19.src.rpm
>> rpm -Uvh kernel*.src.rpm
>> cd rpmbuild/SPECS
>> yum-builddep kernel
>> rpmbuild -bp kernel.spec
>>
>> Generally when fedora builds kernels it produces a /boot/config-`uname -r` file describing the configure used to build the kernel.  This is in the kernel rpm.  I don't recall if the kernel rpm is installed in the basic aarch64 image.  You may need to do a "yum install kernel" to get that installed on the machine.
>>
>> -Will
>>
>