Pull tracing updates from Steven Rostedt: - Add function names as a way to filter function addresses - Add sample module to test ftrace ops and dynamic trampolines - Allow stack traces to be passed from beginning event to end event for synthetic events. This will allow seeing the stack trace of when a task is scheduled out and recorded when it gets scheduled back in. - Add trace event helper __get_buf() to use as a temporary buffer when printing out trace event output. - Add kernel command line to create trace instances on boot up. - Add enabling of events to instances created at boot up. - Add trace_array_puts() to write into instances. - Allow boot instances to take a snapshot at the end of boot up. - Allow live patch modules to include trace events - Minor fixes and clean ups * tag 'trace-v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (31 commits) tracing: Remove unnecessary NULL assignment tracepoint: Allow livepatch module add trace event tracing: Always use canonical ftrace path tracing/histogram: Fix stacktrace histogram Documententation tracing/histogram: Fix stacktrace key tracing/histogram: Fix a few problems with stacktrace variable printing tracing: Add BUILD_BUG() to make sure stacktrace fits in strings tracing/histogram: Don't use strlen to find length of stacktrace variables tracing: Allow boot instances to have snapshot buffers tracing: Add trace_array_puts() to write into instance tracing: Add enabling of events to boot instances tracing: Add creation of instances at boot command line tracing: Fix trace_event_raw_event_synth() if else statement samples: ftrace: Make some global variables static ftrace: sample: avoid open-coded 64-bit division samples: ftrace: Include the nospec-branch.h only for x86 tracing: Acquire buffer from temparary trace sequence tracing/histogram: Wrap remaining shell snippets in code blocks tracing/osnoise: No need for schedule_hrtimeout range bpf/tracing: Use stage6 of tracing to not duplicate macros ...
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| @@ -12,9 +12,9 @@ calls. Only the functions's names and the call time are provided. · 11 unmodified lines | ||
| 12 | 12 | |
| 13 | 13 | Usage: |
| 14 | 14 | Be sure that you have CONFIG_FUNCTION_TRACER |
| 15 | − # mount -t debugfs nodev /sys/kernel/debug | |
| 16 | − # echo function > /sys/kernel/debug/tracing/current_tracer | |
| 17 | − $ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func | |
| 15 | + # mount -t tracefs nodev /sys/kernel/tracing | |
| 16 | + # echo function > /sys/kernel/tracing/current_tracer | |
| 17 | + $ cat /sys/kernel/tracing/trace_pipe > ~/raw_trace_func | |
| 18 | 18 | Wait some times but not too much, the script is a bit slow. |
| 19 | 19 | Break the pipe (Ctrl + Z) |
| 20 | 20 | $ scripts/tracing/draw_functrace.py < ~/raw_trace_func > draw_functrace |