Interactive applications, which includes everything from real time
games through flight simulators and virtual reality environments,
place strong real-time requirements on the whole computing environment
to ensure that the correct data are presented to the user at the
correct time. This requires two things; the first is that the time
when the information will be displayed be known to the...
It is common to see Linux being used on real-time research projects. However, the assumptions made in papers are very often unrealistic. In contrast, researchers argue that the main metric used on PREEMPT RT, although useful, is an oversimplification of the problem.
It is a consensus that the academic research helps to improve Linux’s state-of-art, and vice-versa. So how can we reduce the gap...
The SCHED_DEADLINE scheduling policy is all but done. Even though it existed in mainline for several years, many features are yet to be implemented; some are already available as immature code, some others only exist as wishes.
In this talk Juri Lelli and Daniel Bristot De Oliveira will give the audience in-depth details of what’s missing, what’s under development and what might be desirable...
The first rule of kernel maintenance is that there are no hard and fast rules. While there are several documents and guidelines on patch contribution, advice on how to serve in a maintainer role has historically been tribal knowledge. This organically grown state of affairs is both a source strength and a source of friction. It has served the community well to be adaptable to the different...
What could be done in the kernel to make strace happy.
Being a traditional tool with a long history, strace has been making every effort to overcome various deficiencies in the kernel API. Unfortunately, some of these workarounds are fragile, and in some cases no workaround is possible. In this talk maintainers of strace will describe...
Providing a consistent and predictable performance experience for applications is an important goal for cloud providers. Creating isolated job domains in a multi-tenant shared environment can be extremely challenging. At Google, performance isolation challenges due to memory bandwidth has been on the rise with newer workloads. This talk covers our attempt to understand and mitigate isolation...
Lockdep (the deadlock detector in the Linux kernel) is a powerful tool to detect deadlocks, and has been used for a long time by kernel developers. However, when comes to read/write lock deadlock detections, lockdep only has limited support. Another thing makes this limited support worse is some...
Most modern microprocessors employ complex instruction execution pipelines such that many instructions can be 'in flight' at any given point in time. The efficiency of this pipelining is typically measured in how many instructions get completed per CPU cycle and the metric gets variously called as Instructions Per Cycle (IPC) or the inverse metric Cycles Per Instruction (CPI). Various factors...
The Google computing infrastructure uses containers to manage millions of simultaneously running jobs in data centers worldwide. Although the applications are container aware and are designed to be resilient to failures, evictions due to resource contention and scheduled maintenance events can reduce overall efficiency due to the time required to rebuild complex application state. This talk...
The eXpress Data Path (XDP) has been gradually integrated into the Linux kernel over several releases. XDP offers fast and programmable packet processing in kernel context. The operating system kernel itself provides a safe execution environment for custom packet processing applications, in form of eBPF programs, executed in device driver context. XDP provides a fully integrated solution...
