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https://github.com/torvalds/linux
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dd42cd3ea9
Add a function probe that will cause a stack trace to be traced in the ring buffer when the given function(s) are called. format is: <function>:stacktrace[:<count>] echo 'schedule:stacktrace' > /debug/tracing/set_ftrace_filter cat /debug/tracing/trace_pipe kworker/2:0-4329 [002] ...2 2933.558007: <stack trace> => kthread => ret_from_fork <idle>-0 [000] .N.2 2933.558019: <stack trace> => rest_init => start_kernel => x86_64_start_reservations => x86_64_start_kernel kworker/2:0-4329 [002] ...2 2933.558109: <stack trace> => kthread => ret_from_fork [...] This can be set to only trace a specific amount of times: echo 'schedule:stacktrace:3' > /debug/tracing/set_ftrace_filter cat /debug/tracing/trace_pipe <...>-58 [003] ...2 841.801694: <stack trace> => kthread => ret_from_fork <idle>-0 [001] .N.2 841.801697: <stack trace> => start_secondary <...>-2059 [001] ...2 841.801736: <stack trace> => wait_for_common => wait_for_completion => flush_work => tty_flush_to_ldisc => input_available_p => n_tty_poll => tty_poll => do_select => core_sys_select => sys_select => system_call_fastpath To remove these: echo '!schedule:stacktrace' > /debug/tracing/set_ftrace_filter echo '!schedule:stacktrace:0' > /debug/tracing/set_ftrace_filter Signed-off-by: Steven Rostedt <rostedt@goodmis.org> |
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.. | ||
blktrace.c | ||
ftrace.c | ||
Kconfig | ||
Makefile | ||
power-traces.c | ||
ring_buffer.c | ||
ring_buffer_benchmark.c | ||
rpm-traces.c | ||
trace.c | ||
trace.h | ||
trace_branch.c | ||
trace_clock.c | ||
trace_entries.h | ||
trace_event_perf.c | ||
trace_events.c | ||
trace_events_filter.c | ||
trace_events_filter_test.h | ||
trace_export.c | ||
trace_functions.c | ||
trace_functions_graph.c | ||
trace_irqsoff.c | ||
trace_kdb.c | ||
trace_kprobe.c | ||
trace_mmiotrace.c | ||
trace_nop.c | ||
trace_output.c | ||
trace_output.h | ||
trace_printk.c | ||
trace_probe.c | ||
trace_probe.h | ||
trace_sched_switch.c | ||
trace_sched_wakeup.c | ||
trace_selftest.c | ||
trace_selftest_dynamic.c | ||
trace_stack.c | ||
trace_stat.c | ||
trace_stat.h | ||
trace_syscalls.c | ||
trace_uprobe.c |