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Steven Rostedt (Google) 0f5dcb9f49 tracing: Have large events show up as '[LINE TOO BIG]' instead of nothing 
[ Upstream commit b55b0a0d7c4aa2dac3579aa7e6802d1f57445096 ]

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>
2024-11-18 12:12:16 +01:00
..
blktrace.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bpf_trace.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bpf_trace.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
error_report-traces.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
fgraph.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ftrace.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ftrace_internal.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ipc_logging.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ipc_logging_debug.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ipc_logging_private.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kprobe_event_gen_test.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
power-traces.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
preemptirq_delay_test.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ring_buffer.c tracing: Fix blocked reader of snapshot buffer 2024-11-18 12:12:03 +01:00
ring_buffer_benchmark.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
rpm-traces.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2024-11-18 12:12:01 +01:00
trace.c tracing: Have large events show up as '[LINE TOO BIG]' instead of nothing 2024-11-18 12:12:16 +01:00
trace.h Revert "tracing: Have trace_event_file have ref counters" 2024-11-18 11:57:24 +01:00
trace_benchmark.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_benchmark.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_boot.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_branch.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_clock.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_dynevent.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_dynevent.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_entries.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_event_perf.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_events.c Revert "tracing: Have trace_event_file have ref counters" 2024-11-18 11:57:24 +01:00
trace_events_filter.c Revert "tracing: Have trace_event_file have ref counters" 2024-11-18 11:57:24 +01:00
trace_events_filter_test.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_events_hist.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_events_inject.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_events_synth.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_events_trigger.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_export.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_functions.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_functions_graph.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_hwlat.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_irqsoff.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_kdb.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_kprobe.c tracing/kprobes: Fix the order of argument descriptions 2024-11-18 11:43:11 +01:00
trace_kprobe_selftest.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_kprobe_selftest.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_mmiotrace.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_nop.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_output.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_output.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_preemptirq.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_printk.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_probe.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_probe.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_probe_tmpl.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_readwrite.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_sched_switch.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_sched_wakeup.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_selftest.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_selftest_dynamic.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_seq.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_stack.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_stat.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_stat.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_synth.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_syscalls.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
trace_uprobe.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tracing_map.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
tracing_map.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00