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operating system - Debugging Linux scheduler - Stack …
https://stackoverflow.com/questions/22900469/debugging-linux-scheduler
You might need to raise the kernel log level.Read what level is set currently by: cat /proc/sys/kernel/printk This entry should be greater than DEFAULT_MESSAGE_LOGLEVEL defined in kernel/printk.c You can change it to some other value, say 2 by: . echo 2 > /proc/sys/kernel/printk
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/trace/events.html
The events which are available for tracing can be found in the file /sys/kernel/debug/tracing/available_events. To enable a particular event, such as ‘sched_wakeup’, simply echo it to /sys/kernel/debug/tracing/set_event. For example: # echo sched_wakeup >> /sys/kernel/debug/tracing/set_event Note
Event Tracing — The Linux Kernel documentation
https://www.kernel.org/doc/html/v5.5/trace/events.html
The events which are available for tracing can be found in the file /sys/kernel/debug/tracing/available_events. To enable a particular event, such as ‘sched_wakeup’, simply echo it to /sys/kernel/debug/tracing/set_event. For example: # echo sched_wakeup >> /sys/kernel/debug/tracing/set_event Note
A Linux Kernel Tracing Tutorial – BEC Systems
http://bec-systems.com/site/865/linux-tracing-tutorial
To observe the kernel activity around the kernel platform code, I can do the following: cd /sys/kernel/debug/tracing/ echo 0 > tracing_on (keep trace from filling up until we set filter) echo function_graph > current_tracer echo platform* > set_ftrace_filter echo 1 > tracing_on cat trace_pipe (leave running in a different shell) <insmod my driver>
Fun with Dynamic Kernel Tracing Events
https://events19.linuxfoundation.org/wp-content/uploads/2017/12/oss-eu-2018-fun-with-dynamic-trace-events_steven-rostedt.pdf
sched_switch, sched_waking, hrtimer, etc 2 I assume you are familiar with: ftrace –/sys/kernel/{debug/}tracing –current_tracer –trace file (output) –tracing_on (enabling tracing –Function tracer –Function graph tracer –Trace events sched_switch, sched_waking, hrtimer, etc If not, pretend you are 3 Static events are boring 4
Kernel Tracing with Ftrace - Andreas Ch
https://andreasch.com/2017/12/06/ftrace/
Everything it writes and reads from the I/O as well. branch - This tracer can be configured when tracing likely/unlikely calls within the kernel. It will trace when a likely and unlikely branch is hit and if it was correct in its prediction of being correct. nop - This is the "trace nothing" tracer. A way to disable other tracers and can be use ...
Ftrace Linux Kernel Tracing
https://events.static.linuxfound.org/slides/2010/linuxcon_japan/linuxcon_jp2010_rostedt.pdf
What is Ftrace? Traces the internal operations of the kernel – Static tracepoints within the kernel (event tracing) scheduling interrupts file systems virtual guest connections with host
[PATCH] ftrace: sched_switch plugin is deprecated.
* [tip:perf/core] ftrace: sched_switch plugin is deprecated 2012-02-08 10:05 [PATCH] ftrace: sched_switch plugin is deprecated Geunsik Lim 2012-02-08 10:05 ` [PATCH] ftrace: Append wakeup_rt description of ftrace doc Geunsik Lim @ 2012-02-17 13:50 ` tip-bot for Geunsik Lim 1 sibling, 0 replies; 5+ messages in thread From: tip-bot for Geunsik ...
211339 – Skipped function traces - Linux kernel
https://bugzilla.kernel.org/show_bug.cgi?id=211339
issuing the following commands: # echo "myfunc" > /sys/kernel/debug/tracing/set_ftrace_filter # echo "function_graph" > /sys/kernel/debug/tracing/current_tracer # echo 1 > /sys/kernel/debug/tracing/tracing_on wait a bit ... # echo 0 > /sys/kernel/debug/tracing/tracing_on # /root/trace-cmd extract -o …
[PATCH] ftrace: sched_switch plugin is deprecated.
LKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH] ftrace: sched_switch plugin is deprecated. @ 2012-02-08 10:05 Geunsik Lim 2012-02-08 10:05 ` [PATCH] ftrace: Append wakeup_rt description of ftrace doc Geunsik Lim 2012-02-17 13:50 ` [tip:perf/core] ftrace: sched_switch plugin is deprecated tip-bot for Geunsik Lim 0 siblings, 2 replies; 5+ messages in …
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