Resource: LCA14 Name: LCA14-308: ARMv8 Status & Directions Date: 05-03-2014 Speaker: A.Bergmann, D.Saxena, S.Prabhu

1. Wed 5 March, 12:10pm, A.Bergmann, D.Saxena, S.
Prabhu
LCA14-308: ARMv8 status & directions

2. • Current Linaro Work
• Current Community Efforts
• Next Areas of Focus
Agenda

3. • Current Status
• UP kexec reboot was working
• Bugs in current ARM64 infrastructure need fixing
• Work on SMP support just started
• Next Steps
• Continue work on SMP support
• Add more file formats to kexec-tools
Current Work @ Linaro - Kexec

4. • Current Status
• patch v6 submitted on Feb 28th
• patch v2 for seccomp also submitted on Feb 25th
• no big issue left
• Next Steps
• to be merged into 3.15
• userspace tools (audit, libseccomp) to be synced with kernel updates
Current Work @ Linaro - Audit

5. • Current Status
• patch v5 submitted on Feb 28th
• no big issue left
• Next Steps
• to be merged into 3.15
Current Work @ Linaro - Ftrace

6. Current Work @ Linaro - [KU]probes
• Current Status (Kprobes)
• Kprobes v3 patchset is ready, testing in progress.
• Git: git://git.linaro.org/people/sandeepa.prabhu/linux-aarch64.git Branch: arm64_kprobes_3.14-rc3
• Fixes for recursive kprobes and kretprobes, v2 review comments
addressed.
Next Steps
• Validate with systemtap testsuite and perf.
• Publish v3, targeting 3.15
• Current Status (Uprobes)
• Just starting, blocking on lack of resources.

7. • Current Status
• Patch v1 submitted on Dec.12th
• Fixed the code according to the comments on Patch v1
• Doing LTP on little-endian and big-endian ARMv8 system to meet the
maintainer’s request
• Running into BE environment issues, hope to solve this week
• Next Steps
• Provide the LTP test reports,then submit Patch v2
• Hope to be merged into 3.15
Current Work @ Linaro - Cortex Strings

8. There is an effort within LEG to optimise server workloads
on ARM. For the kernel...
• Current Status
• fast_gup RFC V2 sent out, next version being worked on.
• Odds and ends (PTE_WRITE, !!) sent out to fix subtle problems.
(patches for ARM64 have been merged)
• V6 patches for perf support for compat on ARM64 sent out, and have
been acked. They should be merged in the next window.
• Next Steps
• Subsystem profiling & optimisation starts with the memory.
• We will be working with 32 bit ARM server hardware….
• …. unless anyone wants their 64 bit ARM server hardware running
optimally ;-).
Current Work @ Linaro - LEG Optimisation

9. More about Linaro Connect: http://connect.linaro.org
More about Linaro: http://www.linaro.org/about/
More about Linaro engineering: http://www.linaro.org/engineering/
Linaro members: www.linaro.org/members