Masami Hiramatsu (Google) ca296d32ec tracing: ring_buffer: Rewind persistent ring buffer on reboot ... Rewind persistent ring buffer pages which have been read in the previous boot. Those pages are highly possible to be lost before writing it to the disk if the previous kernel crashed. In this case, the trace data is kept on the persistent ring buffer, but it can not be read because its commit size has been reset after read. This skips clearing the commit size of each sub-buffer and recover it after reboot. Note: If you read the previous boot data via trace_pipe, that is not accessible in that time. But reboot without clearing (or reusing) the read data, the read data is recovered again in the next boot. Thus, when you read the previous boot data, clear it by `echo > trace`. Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://lore.kernel.org/174899582116.955054.773265393511190051.stgit@mhiramat.tok.corp.google.com Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>		2025-07-09 20:38:42 -04:00
..
rv	rv: Fix out-of-bound memory access in rv_is_container_monitor()	2025-04-12 12:13:30 -04:00
blktrace.c	traceevent/block: Add REQ_ATOMIC flag to block trace events	2025-05-23 09:18:48 -06:00
bpf_trace.c	bpf: Fix error return value in bpf_copy_from_user_dynptr	2025-05-23 13:25:02 -07:00
bpf_trace.h
error_report-traces.c
fgraph.c	ftrace: Show subops in enabled_functions	2025-05-08 09:36:08 -04:00
fprobe.c	tracing: fprobe: Fix RCU warning message in list traversal	2025-05-10 08:28:02 +09:00
ftrace_internal.h
ftrace.c	RISC-V Patches for the 6.16 Merge Window, Part 1	2025-06-06 18:05:18 -07:00
Kconfig	ftrace: Have tracing function args depend on PROBE_EVENTS_BTF_ARGS	2025-04-02 09:50:56 -04:00
kprobe_event_gen_test.c
Makefile
pid_list.c	tracing: Cleanup upper_empty() in pid_list	2025-05-14 11:19:32 -04:00
pid_list.h
power-traces.c
preemptirq_delay_test.c
rethook.c
ring_buffer_benchmark.c	ring-buffer: Use str_low_high() helper in ring_buffer_producer()	2024-10-19 11:12:25 -04:00
ring_buffer.c	tracing: ring_buffer: Rewind persistent ring buffer on reboot	2025-07-09 20:38:42 -04:00
rpm-traces.c
synth_event_gen_test.c
trace_benchmark.c
trace_benchmark.h
trace_boot.c
trace_branch.c	tracing: branch: Use trace_tracing_is_on_cpu() instead of "disabled" field	2025-05-09 15:19:10 -04:00
trace_btf.c
trace_btf.h
trace_clock.c	tracing: Use atomic64_inc_return() in trace_clock_counter()	2024-10-09 19:59:49 -04:00
trace_dynevent.c	tracing: probes: Fix a possible race in trace_probe_log APIs	2025-05-13 22:23:34 +09:00
trace_dynevent.h	tracing: probes: Fix a possible race in trace_probe_log APIs	2025-05-13 22:23:34 +09:00
trace_entries.h	ftrace: Expose call graph depth as unsigned int	2025-05-08 09:36:08 -04:00
trace_eprobe.c	tracing: add missing trace_probe_log_clear for eprobes	2025-05-10 08:44:50 +09:00
trace_event_perf.c	perf: Remove unnecessary parameter of security check	2025-02-26 14:13:58 -05:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Fix filter logic error	2025-06-27 15:51:36 -04:00
trace_events_hist.c	tracing: Rename event_trigger_alloc() to trigger_data_alloc()	2025-05-09 15:19:11 -04:00
trace_events_inject.c
trace_events_synth.c	tracing: Do not add length to print format in synthetic events	2025-04-09 11:34:21 -04:00
trace_events_trigger.c	tracing updates for v6.16:	2025-05-29 21:04:36 -07:00
trace_events_user.c	tracing/user_events: Slightly simplify user_seq_show()	2025-03-06 13:35:27 -05:00
trace_events.c	tracing: Add a helper function to handle the dereference arg in verifier	2025-05-09 15:19:11 -04:00
trace_export.c
trace_fprobe.c	Probes fixes for v6.14:	2025-04-08 12:51:34 -07:00
trace_functions_graph.c	fgraph: Do not enable function_graph tracer when setting funcgraph-args	2025-06-18 07:43:22 -04:00
trace_functions.c	tracing updates for v6.16:	2025-05-29 21:04:36 -07:00
trace_hwlat.c	tracing: Remove TRACE_EVENT_FL_FILTERED logic	2024-10-08 15:24:49 -04:00
trace_irqsoff.c	tracing: Use atomic_inc_return() for updating "disabled" counter in irqsoff tracer	2025-05-09 15:19:10 -04:00
trace_kdb.c	tracing: kdb: Use tracer_tracing_on/off() instead of setting per CPU disabled	2025-05-09 15:18:47 -04:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing: probes: Fix a possible race in trace_probe_log APIs	2025-05-13 22:23:34 +09:00
trace_mmiotrace.c	tracing/mmiotrace: Remove reference to unused per CPU data pointer	2025-05-08 09:36:09 -04:00
trace_nop.c
trace_osnoise.c	tracing/osnoise: Allow arbitrarily long CPU string	2025-05-08 09:36:09 -04:00
trace_output.c	tracing: Show preempt and irq events callsites from the offsets in field print	2025-05-06 11:34:52 -04:00
trace_output.h	ftrace: Add print_function_args()	2025-03-04 11:27:23 -05:00
trace_preemptirq.c	tracing: Fix archs that still call tracepoints without RCU watching	2024-12-05 09:28:58 -05:00
trace_printk.c
trace_probe_kernel.h
trace_probe_tmpl.h	tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS	2024-12-26 10:50:04 -05:00
trace_probe.c	tracing: probes: Fix a possible race in trace_probe_log APIs	2025-05-13 22:23:34 +09:00
trace_probe.h	tracing: probe-events: Log error for exceeding the number of arguments	2025-03-27 21:19:54 +09:00
trace_recursion_record.c
trace_sched_switch.c	pid: allow pid_max to be set per pid namespace	2024-12-02 11:25:25 +01:00
trace_sched_wakeup.c	tracing: Convert the per CPU "disabled" counter to local from atomic	2025-05-09 15:19:10 -04:00
trace_selftest_dynamic.c
trace_selftest.c	fgraph: Pass ftrace_regs to retfunc	2024-12-26 10:50:03 -05:00
trace_seq.c
trace_stack.c	tracing updates for v6.16:	2025-05-29 21:04:36 -07:00
trace_stat.c	tracing: Switch trace_stat.c code over to use guard()	2024-12-26 10:38:37 -05:00
trace_stat.h
trace_synth.h
trace_syscalls.c	tracing/perf: Add might_fault check to syscall probes	2024-10-09 17:09:46 -04:00
trace_uprobe.c	bpf-next-6.16	2025-05-28 15:52:42 -07:00
trace.c	ring-buffer changes for v6.16:	2025-05-30 21:20:11 -07:00
trace.h	tracing: Allow the top level trace_marker to write into another instances	2025-05-09 15:19:11 -04:00
tracing_map.c	tracing: Fix cmp_entries_dup() to respect sort() comparison rules	2024-12-04 10:38:24 -05:00
tracing_map.h