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linux-stable/kernel/trace
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Steven Rostedt (Google) c3729567de tracing: Have large events show up as '[LINE TOO BIG]' instead of nothing 
[ Upstream commit b55b0a0d7c ]

If a large event was added to the ring buffer that is larger than what the
trace_seq can handle, it just drops the output:

 ~# cat /sys/kernel/tracing/trace
 # tracer: nop
 #
 # entries-in-buffer/entries-written: 2/2   #P:8
 #
 #                                _-----=> irqs-off/BH-disabled
 #                               / _----=> need-resched
 #                              | / _---=> hardirq/softirq
 #                              || / _--=> preempt-depth
 #                              ||| / _-=> migrate-disable
 #                              |||| /     delay
 #           TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
 #              | |         |   |||||     |         |
            <...>-859     [001] .....   141.118951: tracing_mark_write           <...>-859     [001] .....   141.148201: tracing_mark_write: 78901234

Instead, catch this case and add some context:

 ~# cat /sys/kernel/tracing/trace
 # tracer: nop
 #
 # entries-in-buffer/entries-written: 2/2   #P:8
 #
 #                                _-----=> irqs-off/BH-disabled
 #                               / _----=> need-resched
 #                              | / _---=> hardirq/softirq
 #                              || / _--=> preempt-depth
 #                              ||| / _-=> migrate-disable
 #                              |||| /     delay
 #           TASK-PID     CPU#  |||||  TIMESTAMP  FUNCTION
 #              | |         |   |||||     |         |
            <...>-852     [001] .....   121.550551: tracing_mark_write[LINE TOO BIG]
            <...>-852     [001] .....   121.550581: tracing_mark_write: 78901234

This now emulates the same output as trace_pipe.

Link: https://lore.kernel.org/linux-trace-kernel/20231209171058.78c1a026@gandalf.local.home

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-01-25 14:52:29 -08:00
..
blktrace.c trace/blktrace: fix memory leak with using debugfs_lookup() 2023-03-10 09:39:47 +01:00
bpf_trace.c bpf: Clear the probe_addr for uprobe 2023-09-19 12:22:32 +02:00
bpf_trace.h
error_report-traces.c
fgraph.c
ftrace.c ftrace: Fix possible warning on checking all pages used in ftrace_process_locs() 2023-07-23 13:47:56 +02:00
ftrace_internal.h
Kconfig tracing: Fix complicated dependency of CONFIG_TRACER_MAX_TRACE 2023-01-12 11:58:55 +01:00
kprobe_event_gen_test.c tracing: Fix wrong return in kprobe_event_gen_test.c 2023-04-05 11:24:54 +02:00
Makefile
pid_list.c
pid_list.h
power-traces.c
preemptirq_delay_test.c
ring_buffer.c ring-buffer: Fix slowpath of interrupted event 2024-01-05 15:13:40 +01:00
ring_buffer_benchmark.c
rpm-traces.c
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2024-01-05 15:13:35 +01:00
trace.c tracing: Have large events show up as '[LINE TOO BIG]' instead of nothing 2024-01-25 14:52:29 -08:00
trace.h tracing: Have trace_event_file have ref counters 2023-11-28 16:56:36 +00:00
trace_benchmark.c
trace_benchmark.h
trace_boot.c
trace_branch.c
trace_clock.c
trace_dynevent.c tracing: Free buffers when a used dynamic event is removed 2022-12-08 11:28:43 +01:00
trace_dynevent.h
trace_entries.h
trace_eprobe.c kernel/trace: Fix cleanup logic of enable_trace_eprobe 2023-07-23 13:47:43 +02:00
trace_event_perf.c tracing/perf: Fix double put of trace event when init fails 2022-08-25 11:39:57 +02:00
trace_events.c tracing: Have trace_event_file have ref counters 2023-11-28 16:56:36 +00:00
trace_events_filter.c tracing: Have trace_event_file have ref counters 2023-11-28 16:56:36 +00:00
trace_events_filter_test.h
trace_events_hist.c tracing: Allow synthetic events to pass around stacktraces 2023-08-03 10:22:30 +02:00
trace_events_inject.c tracing: Have event inject files inc the trace array ref count 2023-10-06 13:18:02 +02:00
trace_events_synth.c tracing: Have the user copy of synthetic event address use correct context 2023-11-28 16:56:31 +00:00
trace_events_trigger.c tracing: Fix to check event_mutex is held while accessing trigger list 2022-09-15 11:30:02 +02:00
trace_export.c
trace_functions.c
trace_functions_graph.c
trace_hwlat.c tracing: Remove extra space at the end of hwlat_detector/mode 2023-09-19 12:22:48 +02:00
trace_irqsoff.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-30 16:18:13 +02:00
trace_kdb.c
trace_kprobe.c tracing/kprobes: Fix symbol counting logic by looking at modules as well 2024-01-15 18:51:26 +01:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c tracing/osnoise: Fix duration type 2022-12-08 11:28:43 +01:00
trace_output.c tracing: Make sure trace_printk() can output as soon as it can be used 2023-02-01 08:27:23 +01:00
trace_output.h
trace_preemptirq.c tracing: hold caller_addr to hardirq_{enable,disable}_ip 2022-09-20 12:39:43 +02:00
trace_printk.c
trace_probe.c Revert "tracing: Add "(fault)" name injection to kernel probes" 2023-08-03 10:22:31 +02:00
trace_probe.h tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols 2023-12-23 10:42:00 +01:00
trace_probe_kernel.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-08-03 10:22:31 +02:00
trace_probe_tmpl.h tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails 2023-08-03 10:22:31 +02:00
trace_recursion_record.c
trace_sched_switch.c
trace_sched_wakeup.c tracing: Fix memleak due to race between current_tracer and trace 2023-08-30 16:18:13 +02:00
trace_selftest.c
trace_selftest_dynamic.c
trace_seq.c
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h tracing: Allow synthetic events to pass around stacktraces 2023-08-03 10:22:30 +02:00
trace_syscalls.c
trace_uprobe.c bpf: Clear the probe_addr for uprobe 2023-09-19 12:22:32 +02:00
tracing_map.c
tracing_map.h