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Steven Rostedt (Google) f3dc260cd5 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>
2024-01-20 11:51:43 +01:00
..
rv
Merge tag 'trace-tools-v6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2023-04-28 16:11:26 -07:00
blktrace.c
block: remove more NULL checks after bdev_get_queue()
2023-02-21 09:23:22 -07:00
bpf_trace.c
bpf: Fix uprobe_multi get_pid_task error path
2023-09-15 10:32:40 -07:00
bpf_trace.h
…
error_report-traces.c
…
fgraph.c
tracing: arm64: Avoid missing-prototype warnings
2023-07-12 12:06:04 -04:00
fprobe.c
fprobe: Fix to ensure the number of active retprobes is not zero
2023-10-17 10:22:42 +09:00
ftrace_internal.h
tracing: arm64: Avoid missing-prototype warnings
2023-07-12 12:06:04 -04:00
ftrace.c
ftrace: Fix modification of direct_function hash while in use
2024-01-05 15:19:44 +01:00
Kconfig
Merge tag 'probes-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2023-06-30 10:44:53 -07:00
kprobe_event_gen_test.c
tracing: Fix wrong return in kprobe_event_gen_test.c
2023-03-19 12:20:48 -04:00
Makefile
tracing/probes: Move finding func-proto API and getting func-param API to trace_btf
2023-08-23 09:39:45 +09:00
pid_list.c
tracing: Cleanup double word in comment
2022-04-26 17:58:50 -04:00
pid_list.h
tracing: Create a sparse bitmask for pid filtering
2021-10-05 17:38:45 -04:00
power-traces.c
…
preemptirq_delay_test.c
…
rethook.c
rethook: Use __rcu pointer for rethook::handler
2023-12-13 18:45:19 +01:00
ring_buffer_benchmark.c
ring_buffer: Remove unused "event" parameter
2022-11-23 19:08:30 -05:00
ring_buffer.c
tracing: Fix blocked reader of snapshot buffer
2024-01-05 15:19:44 +01:00
rpm-traces.c
…
synth_event_gen_test.c
tracing / synthetic: Disable events after testing in synth_event_gen_test_init()
2024-01-01 12:42:45 +00:00
trace_benchmark.c
tracing: Add numeric delta time to the trace event benchmark
2022-09-26 13:01:09 -04:00
trace_benchmark.h
tracing: Add numeric delta time to the trace event benchmark
2022-09-26 13:01:09 -04:00
trace_boot.c
tracing/boot: Test strscpy() against less than zero for error
2023-07-05 10:30:49 -04:00
trace_branch.c
…
trace_btf.c
tracing/probes: Add a function to search a member of a struct/union
2023-08-23 09:40:16 +09:00
trace_btf.h
tracing/probes: Add a function to search a member of a struct/union
2023-08-23 09:40:16 +09:00
trace_clock.c
…
trace_dynevent.c
tracing: Free buffers when a used dynamic event is removed
2022-11-23 19:07:12 -05:00
trace_dynevent.h
…
trace_entries.h
tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure
2023-07-30 18:11:44 -04:00
trace_eprobe.c
tracing/probes: Support BTF argument on module functions
2023-08-23 09:39:15 +09:00
trace_event_perf.c
tracing/perf: Use strndup_user instead of kzalloc/strncpy_from_user
2022-11-23 19:08:31 -05:00
trace_events_filter_test.h
…
trace_events_filter.c
tracing: Have trace_event_file have ref counters
2023-11-08 11:56:21 +01:00
trace_events_hist.c
tracing/histograms: Return an error if we fail to add histogram to hist_vars list
2023-07-23 11:18:52 -04:00
trace_events_inject.c
tracing: Have event inject files inc the trace array ref count
2023-09-07 16:38:54 -04:00
trace_events_synth.c
tracing: Have the user copy of synthetic event address use correct context
2023-11-28 17:20:05 +00:00
trace_events_trigger.c
tracing: Fix kernel-doc warnings in trace_events_trigger.c
2023-07-28 19:59:03 -04:00
trace_events_user.c
tracing/user_events: Align set_bit() address for all archs
2023-09-30 16:25:41 -04:00
trace_events.c
tracing: Have trace_event_file have ref counters
2023-11-08 11:56:21 +01:00
trace_export.c
tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure
2023-07-30 18:11:44 -04:00
trace_fprobe.c
tracing: fprobe-event: Fix to check tracepoint event and return
2023-11-28 17:20:13 +00:00
trace_functions_graph.c
function_graph: Support recording and printing the return value of function
2023-06-20 18:38:37 -04:00
trace_functions.c
ftrace: disable preemption when recursion locked
2021-10-27 11:21:49 -04:00
trace_hwlat.c
tracing: Remove extra space at the end of hwlat_detector/mode
2023-09-01 21:00:00 -04:00
trace_irqsoff.c
tracing: Fix memleak due to race between current_tracer and trace
2023-08-17 13:49:37 -04:00
trace_kdb.c
…
trace_kprobe_selftest.c
tracing: arm64: Avoid missing-prototype warnings
2023-07-12 12:06:04 -04:00
trace_kprobe_selftest.h
…
trace_kprobe.c
tracing/kprobes: Fix the order of argument descriptions
2023-11-20 11:59:38 +01:00
trace_mmiotrace.c
…
trace_nop.c
…
trace_osnoise.c
tracing/timerlat: Add user-space interface
2023-06-22 10:39:56 -04:00
trace_output.c
Merge tag 'trace-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2023-06-30 10:33:17 -07:00
trace_output.h
tracing: Add "fields" option to show raw trace event fields
2023-03-29 06:52:08 -04:00
trace_preemptirq.c
cpuidle: tracing, preempt: Squash _rcuidle tracing
2023-01-31 15:01:46 +01:00
trace_printk.c
tracing: Disable "other" permission bits in the tracefs files
2021-10-08 18:08:43 -04:00
trace_probe_kernel.h
tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails
2023-07-14 17:04:58 +09:00
trace_probe_tmpl.h
tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails
2023-07-14 17:04:58 +09:00
trace_probe.c
tracing/probes: Add string type check with BTF
2023-08-23 09:41:13 +09:00
trace_probe.h
tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols
2023-10-20 22:10:41 +09:00
trace_recursion_record.c
tracing: Use trace_create_file() to simplify creation of tracefs entries
2022-05-26 21:12:52 -04:00
trace_sched_switch.c
sched/tracing: Append prev_state to tp args instead
2022-05-12 00:37:11 +02:00
trace_sched_wakeup.c
tracing: Fix memleak due to race between current_tracer and trace
2023-08-17 13:49:37 -04:00
trace_selftest_dynamic.c
…
trace_selftest.c
tracing: Have function_graph selftest call cond_resched()
2023-05-28 21:15:46 -04:00
trace_seq.c
tracing: Fix kernel-doc warnings in trace_seq.c
2023-07-28 19:59:04 -04:00
trace_stack.c
tracing: Disable "other" permission bits in the tracefs files
2021-10-08 18:08:43 -04:00
trace_stat.c
tracing: Disable "other" permission bits in the tracefs files
2021-10-08 18:08:43 -04:00
trace_stat.h
…
trace_synth.h
tracing: Allow synthetic events to pass around stacktraces
2023-01-25 10:31:24 -05:00
trace_syscalls.c
tracing: bpf: use struct trace_entry in struct syscall_tp_t
2023-08-01 10:53:28 -07:00
trace_uprobe.c
Merge tag 'probes-v6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
2023-09-02 11:10:50 -07:00
trace.c
tracing: Have large events show up as '[LINE TOO BIG]' instead of nothing
2024-01-20 11:51:43 +01:00
trace.h
tracing: Have trace_event_file have ref counters
2023-11-08 11:56:21 +01:00
tracing_map.c
tracing: Remove unused variable 'dups'
2022-10-03 12:20:31 -04:00
tracing_map.h
tracing: Remove unused extern declaration tracing_map_set_field_descr()
2023-07-23 11:08:14 -04:00