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| author |   Steven Rostedt <rostedt@goodmis.org> | 2025-03-05 11:45:47 -0500 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2025-03-28 08:39:27 -0400 |
| commit | 5f3719f697c3fdfae5cd6805f10ac7a04b0f4e43 (patch) | |
| tree | 44004eceb1738f5ba8359c8e9095d4228a57baaf /kernel/trace/trace.c | |
| parent | tracing: Show module names and addresses of last boot (diff) | |
| download | wireguard-linux-5f3719f697c3fdfae5cd6805f10ac7a04b0f4e43.tar.xz wireguard-linux-5f3719f697c3fdfae5cd6805f10ac7a04b0f4e43.zip | |
tracing: Update modules to persistent instances when loaded
When a module is loaded and a persistent buffer is actively tracing, add
it to the list of modules in the persistent memory.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/20250305164609.469844721@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index d22f8d34b18d..66c1683fa1dd 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -10087,6 +10087,32 @@ static void trace_module_remove_evals(struct module *mod) static inline void trace_module_remove_evals(struct module *mod) { } #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ +static bool trace_array_active(struct trace_array *tr) +{ + if (tr->current_trace != &nop_trace) + return true; + + /* 0 is no events, 1 is all disabled */ + return trace_events_enabled(tr, NULL) > 1; +} + +static void trace_module_record(struct module *mod) +{ + struct trace_array *tr; + + list_for_each_entry(tr, &ftrace_trace_arrays, list) { + /* Update any persistent trace array that has already been started */ + if ((tr->flags & (TRACE_ARRAY_FL_BOOT | TRACE_ARRAY_FL_LAST_BOOT)) == + TRACE_ARRAY_FL_BOOT) { + /* Only update if the trace array is active */ + if (trace_array_active(tr)) { + guard(mutex)(&scratch_mutex); + save_mod(mod, tr); + } + } + } +} + static int trace_module_notify(struct notifier_block *self, unsigned long val, void *data) { @@ -10095,6 +10121,7 @@ static int trace_module_notify(struct notifier_block *self, switch (val) { case MODULE_STATE_COMING: trace_module_add_evals(mod); + trace_module_record(mod); break; case MODULE_STATE_GOING: trace_module_remove_evals(mod); |