Tracing Microconference Accepted into 2016 Linux Plumbers Conference

After taking a break in 2015, Tracing is back at Plumbers this year! Tracing is heavily used throughout the Linux ecosystem, and provides an essential method for extracting information about the underlying code that is running on the system. Although tracing is simple in concept, effective usage and implementation can be quite involved.

Topics proposed for this year’s event include new features in the BPF compiler collection, perf, and ftrace; visualization frameworks; large-scale tracing and distributed debugging; always-on analytics and monitoring; do-it-yourself tracing tools; and, last but not least, a kernel-tracing wishlist.

We hope to see you there!

Checkpoint-Restore Microconference Accepted into 2016 Linux Plumbers Conference

This year will feature a four-fold deeper dive into checkpoint-restore technology, thanks to participation by people from a number of additional related projects! These are the OpenMPI message-passing library, Berkeley Lab Checkpoint/Restart (BLCR), and Distributed MultiThreaded CheckPointing (DMTCP) (not to be confused with TCP/IP), in addition to the Checkpoint/Restore in Userspace group that has participated in prior years.

Docker integration remains a hot topic, as is post-copy live migration, as well as testing/validation. As you might guess from the inclusion of people from BLCR and OpenMPI, checkpoint-restore for distributed workloads (rather than just single systems) is an area of interest.

Please join us for a timely and important discussion!

Testing & Fuzzing Microconference Accepted into 2016 Linux Plumbers Conference

Testing, fuzzing, and other diagnostics have made the Linux ecosystem much more robust than in the past, but there are still embarrassing bugs. Furthermore, million-year bugs will be happening many times per day across Linux’s huge installed base, so there is clearly need for even more aggressive validation.

The Testing and Fuzzing Microconference aims to significantly increase the aggression level of Linux-kernel validation, with discussions on tools and test suites including kselftest, syzkaller, trinity, mutation testing, and the 0day Test Robot. The effectiveness of these tools will be attested to by any of their victims, but we must further raise our game as the installed base of Linux continues to increase.

One additional way of raising the level of testing aggression is to document the various ABIs in machine-readable format, thus lowering the barrier to entry for new projects. Who knows? Perhaps Linux testing will be driven by artificial-intelligence techniques!

Join us for an important and spirited discussion!

Device Tree Microconference Accepted into 2016 Linux Plumbers Conference

Device-tree discussions are probably not quite as spirited as in the past, however, device tree is an active area. In particular, significant issues remain.

This microconference will cover the updated device-tree specification, debugging, bindings validation, and core-kernel code directions. In addition, there will be discussion of what does (and does not) go into the device tree, along with the device-creation and driver binding ordering swamp.

Join us for an important and spirited discussion!

PCI Microconference Accepted into 2016 Linux Plumbers Conference

Given that PCI was introduced more than two decades ago and that PCI Express was introduced more than ten years ago, one might think that the Linux plumbing already did everything possible to support PCI.

One would be quite wrong.

One issue with current PCI support is that resource allocation is handled on a per-architecture basis, leading to duplicate code, and, worse yet, duplicate bugs. This microconference will therefore look into possible consolidation of this code.

Another issue is integration of PCI’s message-signaled interrupts (MSI) into the kernel’s core interrupt code. Whilst the device tree bindings and relative core code for MSI management have just been integrated, legacy code needs more work, including architecture-specific code and PCI legacy host controller drivers. In addition, attention should be paid to the ACPI bindings, to the related ACPI kernel core code, and to the MSI passthrough usage in virtualized environments.

Advances in Virtualization technologies, System I/O devices and their memory management through IOMMU components are driving features in the PCI Express specifications (Address Translation Services (ATS) and Page Request Interface (PRI)). This microconference will also foster debate on the best way to integrate these features in the kernel in a seamless way for different architectures.

Of course, no discussion of PCI would be complete without considering firmware issues, hardware quirks, power management, and the interplay between device tree and ACPI.

Join us for an important new-to-Plumbers PCI discussion!

Call for Refereed-Track Proposals

We are pleased to announce the Call for Refereed-Track Proposals for the 2016 edition of the Linux Plumbers Conference, which will held be in Santa Fe, NM, USA on November 2-4 in conjunction with Linux Kernel Summit.

Refereed track presentations are 50 minutes in length and should focus on a specific aspect of the “plumbing” in the Linux system. Examples of Linux plumbing include core kernel subsystems, core libraries, windowing systems, management tools, device support, media creation/playback, and so on. The best presentations are not about finished work, but rather problems, proposals, or proof-of-concept solutions that require face-to-face discussions and debate.

Given that Plumbers is not colocated with LinuxCon this year, we are spreading the refereed-track talks over all three days. This provides a change of pace and also provides a conflict-free schedule for the refereed-track talks. (Yes, this does result in more conflicts between the referred-track talks and the Microconferences, but there never is a truly free lunch.)

Linux Plumbers Conference Program Committee members will be reviewing all submitted sessions. High-quality submisssion that cannot be accepted due to the limited number of slots will be forwarded to the Microconference leads for further consideration.

To submit a refereed track talk proposal follow the instructions at this website.

Submissions are due on or before Thursday 1 September, 2016 at 11:59PM Pacific Time. Since this is after the closure of early registration, speakers may register before this date and we’ll refund the registration for any selected presentation’s speaker, but for only one speaker per presentation.

Finally, we are still accepting Microconference submissions here.

Submissions close: September 1, 2016
Speakers notified: September 22, 2016
Slides due: November 1, 2016

Live Kernel Patching Microconference Accepted into 2016 Linux Plumbers Conference

Live kernel patching was accepted into the Linux kernel in v4.0 in February 2015, so we can declare the 2014 LPC Live Kernel Patching Microconference to have been a roaring success! However, as was noted at the time, this is just the beginning of the real work. In short, the v4.0 work makes live kernel patching possible, but more work is required to make it more reliable and more routine.

Additional issues include stacktrace reliability, patch-safety criteria for kernel threads, thread consistency models, porting to non-x86 architectures, handling of loadable modules, compiler optimizations, userspace tooling, patching of data, automated regression testing, and patch-creation guidelines.

Join us for an important and spirited discussion!

Containers Microconference Accepted into 2016 Linux Plumbers Conference

The level of Containers excitement has increased even further this year, with much interplay between Docker, Kubernetes, Rkt, CoreOS, Mesos, LXC, LXD, OpenVZ, systemd, and much else besides. This excitement has led to some interesting new use cases, including even the use of containers on Android.

Some of these use cases in turn require some interesting new changes to the Linux plumbing, including mounts in unprivileged containers, improvements to cgroups resource management, ever-present security concerns, and interoperability between various sets of tools.

Please join us for an important discussion on an important aspect of cloud computing!

Power Management and Energy-Awareness Microconference Accepted into 2016 Linux Plumbers Conference

Power management and energy efficiency continues to receive considerable attention, and is becoming a Plumbers tradition (see the 2015 wiki for last year’s instance). This year’s microconference will continue these efforts.

This microconference will look at elimination of timers from cpufreq governors, unifying idle management in SoCs with power resources shared between CPUs and I/O devices, load balancing utilizing workload consolidation and/or platform energy models to improve energy-efficiency and/or performance, improving CPU frequency selection efficiency by utilizing information provided by the scheduler in intel_pstate and cpufreq governors, idle injection (CFS-based vs. play idle with kthreads [PDF]), ACPI compliance tests (from the power management perspective) and more.

We hope to see you there!

Call for Microconferences

We are pleased to announce the Call for Microconferences for the 2016 edition of the Linux Plumbers Conference, which will be held in Santa Fe, NM, USA on November 2-4 in conjunction with Linux Kernel Summit.

A microconference is a collection of collaborative sessions focused on problems in a particular area of the Linux plumbing, which includes the kernel, libraries, utilities, UI, and so forth, but can also focus on cross-cutting concerns such as security, scaling, energy efficiency, or a particular use case. Good microconferences result in solutions to these problems and concerns, while the best microconferences result in patches that implement those solutions. For more information on submitting a microconference proposal, see

Of course, there is more to Plumbers than microconferences, so look for upcoming calls for refereed-track presentations, BoFs, hackfests, and lightning talks. We hope to see you in Santa Fe this coming November!