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In-Kernel Low Latency Tracing and Networking | SCALE 14x
https://www.socallinuxexpo.org/scale/14x/presentations/kernel-low-latency-tracing-and-networking
Using tools from the IO Visor Project, learn how to run JIT compiled C programs inside your kernel using the eBPF "in-kernel virtual machine".Combined with kprobes or tc filters, it can work to discover disk latency bottlenecks in your application or analyze your container networking performance, and many things in between!
Hardware Latency Detector — The Linux Kernel …
https://www.kernel.org/doc/html/v5.17/trace/hwlat_detector.html
The hardware latency detector works by hogging one of the cpus for configurable amounts of time (with interrupts disabled), polling the CPU Time Stamp Counter for some period, then looking for gaps in the TSC data. ... Write the ASCII text “hwlat” into the current_tracer file of the tracing system (mounted at /sys/kernel/tracing or /sys ...
GitHub - efficios/latency-tracker: Kernel module to track …
https://github.com/efficios/latency-tracker
Coupled with a buffering kernel tracer (LTTng in snapshot mode or ftrace), it can be used to stop the tracing and extract the trace from memory only when an unusual latency is detected. This use-case is very powerful to collect highly detailed information but still keep the trace short enough and focused around the interesting event.
New Ways to Find Latency in Linux Using Tracing - P99 CONF 2021
https://www.p99conf.io/session/new-ways-to-find-latency-in-linux-using-tracing/
New Ways to Find Latency in Linux Using Tracing Ftrace is the official tracer of the Linux kernel. It originated from the real-time patch (now known as PREEMPT_RT), as developing an operating system for real-time use requires deep insight and transparency of the happenings of the kernel.
Hardware Latency Detector — The Linux Kernel …
https://docs.kernel.org/4.20/trace/hwlat_detector.html
Write the ASCII text “hwlat” into the current_tracer file of the tracing system (mounted at /sys/kernel/tracing or /sys/kernel/tracing). It is possible to redefine the threshold in microseconds (us) above which latency spikes will be taken into account. Example:
Kernel Latency - MATLAB & Simulink
https://www.mathworks.com/help/soc/ug/kernel-latency.html
Kernel latency defines the time required for the operating system to respond to a trigger signal, stop execution of any running threads, and start the execution of the thread responsible for the trigger signal. SoC Blockset™ models simulate Kernel latency as a delay at the start of execution of a task the first time the task moves from the ...
Linux Tracing Technologies — The Linux Kernel …
https://www.kernel.org/doc/html/v5.4/trace/index.html
Using the Linux Kernel Tracepoints Purpose of tracepoints Usage Event Tracing 1. Introduction 2. Using Event Tracing 3. Defining an event-enabled tracepoint 4. Event formats 5. Event filtering 6. Event triggers Subsystem Trace Points: kmem 1. Slab allocation of small objects of unknown type 2. Slab allocation of small objects of known type 3.
Tracing the Linux kernel with ftrace - #embeddedbits
https://embeddedbits.org/tracing-the-linux-kernel-with-ftrace/
Ftrace stands for function tracer and basically lets you watch and record the execution flow of kernel functions. It was created by Steven Rostedt, derived from two other tools called latency tracer from Ingo Molnar and Steven’s logdev utility. With ftrace you can really see what the …
3.9. Using the ftrace Utility for Tracing Latencies - Red Hat
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux_for_real_time/7/html/tuning_guide/using_the_ftrace_utility_for_tracing_latencies
One of the diagnostic facilities provided with the Red Hat Enterprise Linux for Real Time kernel is ftrace, which is used by developers to analyze and debug latency and performance issues that occur outside of user-space. The ftrace utility has a variety of options that allow you to use the utility in a number of different ways.
ftrace - Function Tracer — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/trace/ftrace.html
The kernel function tracing_off () can be used within the kernel to disable writing to the ring buffer, which will set this file to “0”. User space can re-enable tracing by echoing “1” into the file. Note, the function and event trigger “traceoff” will also set this file to zero and stop tracing.
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