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8b7f9cde0f
Merge the sched_switch ftrace helper scripts into a single python script that prints the result to stdout. In this way it's possible to generate a perfetto-compatible trace running: $ sudo ./scripts/sched_ftrace.py > sched.ftrace Signed-off-by: Andrea Righi <andrea.righi@linux.dev>
67 lines
1.7 KiB
Python
Executable File
67 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import os
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import sys
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import time
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HEADER = "TASK-PID"
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BUFF_STARTED = "buffer started ###"
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TRACING_PATH = "/sys/kernel/debug/tracing"
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TRACE_PIPE_PATH = os.path.join(TRACING_PATH, "trace_pipe")
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def ftrace_trim(stream, duration, nproc):
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nproc = nproc - 1
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seen_header = False
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proc_buffer_started = 0
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start_time = time.time()
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for line in stream:
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if time.time() - start_time >= duration:
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break
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l = line.replace("\n", "")
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if HEADER in l:
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seen_header = True
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print(l)
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if BUFF_STARTED in line:
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proc_buffer_started += 1
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continue
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if proc_buffer_started == nproc or not seen_header:
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print(l)
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def run_trace(duration):
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tracing_on_path = os.path.join(TRACING_PATH, "tracing_on")
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sched_switch_enable_path = os.path.join(
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TRACING_PATH, "events/sched/sched_switch/enable"
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)
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# Enable tracing and sched_switch event
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with open(tracing_on_path, "w") as f:
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f.write("1")
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with open(sched_switch_enable_path, "w") as f:
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f.write("1")
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# Process the sched_switch events from the trace file
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try:
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with open(TRACE_PIPE_PATH, "r") as trace_pipe:
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ftrace_trim(trace_pipe, duration, os.cpu_count())
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except KeyboardInterrupt:
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pass # Allow clean termination with Ctrl+C
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# Disable tracing and sched_switch event after the duration
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with open(sched_switch_enable_path, "w") as f:
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f.write("0")
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with open(tracing_on_path, "w") as f:
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f.write("0")
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def main():
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duration = int(sys.argv[1]) if len(sys.argv) > 1 else 5
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run_trace(duration)
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if __name__ == "__main__":
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main()
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