Linaro Connect edition...
RAG:
GREEN: productive Connect, hammered out a KVM TODO list
* As usual, most sessions don't really intersect with KVM/QEMU work,
so the bulk of the benefit of the week was in informal discussions
and hacking sessions. Useful outcomes there:
* Dragged Rusty through some of the more obscure corners of the
ARM architecture, in the course of doing a review of all the
A15 cp15 registers and how KVM should handle them
* Thrashed out a todo list for getting to "initial upstreamable
patchset" for KVM:
https://docs.google.com/document/d/1TSpDKQZ-6u-HH_2BNY_85jDStI2YDhENf5-z8Nb…
* Nailed down a few decisions we'd left hanging for a bit
* A few sessions that seem worth mentioning:
* Enterprise bootloaders
Jon M definitely pushing the idea that servers will want ACPI,
UEFI, etc all to look as consistent and like x86 as possible. This
includes a desire for UEFI in the virtual environment provided by
QEMU/KVM. We've been aware we might want to do that, but there is
definitely some work to do to get UEFI running (probably a combo of
QEMU bugfixes/feature work and patching UEFI). Total work required
hard to estimate because you just have to keep fixing bugs until it
works... (The push for UEFI was repeated in a couple of other
sessions too.)
* v8 discussion
The question of whether there will be a v8 QEMU was raised (again).
There do seem to be enough people interested that we should be able
to collaborate on a user-mode emulator, which I think is a good
outcome. This will obviously depend on release of enough public
info on the architecture.
* KVM performance
Bit of a null session, as it turns out that we aren't really ready
to think about performance. We believe there aren't any obvious
areas requiring optimisation in the current KVM patchset. Virtio is
the only thing to be added later, and this is really just missing
QEMU side rather than needing specific kernel support. We did take
the opportunity to go through our TODO list for KVM functionality;
nobody raised anything we'd missed, so that's good.
-- PMM
The Linaro Toolchain Working Group is pleased to announce the 2012.05
release of the Linaro Toolchain Binaries, a pre-built version of
Linaro GCC and Linaro GDB that runs on generic Linux or Windows and
targets the glibc Linaro Evaluation Build.
Uses include:
* Cross compiling ARM applications from your laptop
* Remote debugging
* Build the Linux kernel for your board
What's included:
* Linaro GCC 2012.05
* Linaro GDB 2012.04
* A statically linked gdbserver
* A system root
* Manuals under share/doc/
The system root contains the basic header files and libraries to link
your programs against.
Interesting changes include:
* Updates the system root to Ubuntu Precise
* Switches to the arm-linux-gnueabihf triplet
* Compiles programs for hard float by default
* Includes soft float support for ARMv4T and later systems
* Includes debug symbols for debugging and backtracing the C library
The Linux version is supported on Ubuntu 10.04.3 and 12.04, Debian
6.0.2, Fedora 16, openSUSE 12.1, Red Hat Enterprise Linux Workstation
5.7 and later, and should run on any Linux Standard Base 3.0
compatible distribution. Please see the README about running on
x86_64 hosts.
The Windows version is supported on Windows XP Pro SP3, Windows Vista
Business SP2, and Windows 7 Pro SP1.
The binaries and build scripts are available from:
https://launchpad.net/linaro-toolchain-binaries/trunk/2012.05
Need help? Ask a question on https://ask.linaro.org/
Already on Launchpad? Submit a bug at
https://bugs.launchpad.net/linaro-toolchain-binaries
On IRC? See us on #linaro on Freenode.
Other ways that you can contact us or get involved are listed at
https://wiki.linaro.org/GettingInvolved.
Thanks to the change in the schedule the agenda is here.
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2012-05-28
If there are any topics folks would like to add to this for today
please feel free to do so now given we have a session in under 2
hours.
regards,
Ramana
Progress
* Fixed PR53334 upstream - something that broke eembc builds.
* Usual meetings.
* Work through some of the speed tickets and upstream bugzilla perf
tickets in preparation for connect.
* Prepared for connect. Looked through some open issues and
investigating PR48941 patch. Uli and I had some discussions around the
patches for this and I had an idea later this evening to try out
something with __builtin_shuffle which certainly looks interesting and
is effectively what we came up with . It's probably better to use
__builtin_shuffle rather than inventing something on our own. In the
process found a bug with automatic rev generation from vec_perm
expressions and that should now be fixed.
* Worked through the auto-inc-dec stuff. Still needs some work and
looks unlikely to complete before connect and that's something I need
to keep working through.
* Prepared for connect.
Plans
* Connect next week !
Absences:
28 May - 1 June : Linaro Connect
Committed my core-shifts patch into Linaro GCC.
Checked and posted my (newly rebased) neon-shifts patch upstream for review.
Continued work on my brain-dump of work in progress. Cleaned up, tested
and posted example testcases and before/after compiler output for all my
work-in-progress patches.
Looked at LaunchPad bug #851258. It's a miss-optimization bug that would
take some effort to fix.
Discovered that my lower-subreg build had failed due to Werror. Fixed
the warning, reuploaded the sources, and relaunched the build.
Prepared for travel to Connect.
== GCC ==
* Followed up on review comments on reassociation pass.
* Analyzed performance headroom of Linaro GCC 4.7 compared
to various other compilers and identified several missing
optimisations.
== Misc ==
* Prepared for Linaro Connect Hong Kong.
Mit freundlichen Gruessen / Best Regards
Ulrich Weigand
--
Dr. Ulrich Weigand | Phone: +49-7031/16-3727
STSM, GNU compiler and toolchain for Linux on System z and Cell/B.E.
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter | Geschäftsführung: Dirk
Wittkopp
Sitz der Gesellschaft: Böblingen | Registergericht: Amtsgericht
Stuttgart, HRB 243294
Current Milestones:
|| || Planned || Estimate || Actual ||
||cp15-rework || 2012-01-06 || 2012-06-23 || ||
== other ==
* preparation for Connect
* wrote up and sent out proposal about handling TrustZone for KVM
* investigated some issues Riku found when testing his packaged
version of KVM (one model issue, one kernel-too-old issue)
* usual upstream maintainer duties
-- PMM
