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tracing: Only clear trace buffer on module unload if event was traced 

Currently, when a module with events is unloaded, the trace buffer is
cleared. This is just a safety net in case the module might have some
strange callback when its event is outputted. But there's no reason
to reset the buffer if the module didn't have any of its events traced.

Add a flag to the event "call" structure called WAS_ENABLED and gets set
when the event is ever enabled, and this flag never gets cleared. When a
module gets unloaded, if any of its events have this flag set, then the
trace buffer will get cleared.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2013-03-04 23:05:12 -05:00 committed by Steven Rostedt
parent 2a30c11f6a
commit 575380da8b
2 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/ftrace_event.h
View File

@ -197,6 +197,7 @@ enum {
TRACE_EVENT_FL_CAP_ANY_BIT,
TRACE_EVENT_FL_NO_SET_FILTER_BIT,
TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
TRACE_EVENT_FL_WAS_ENABLED_BIT,
};
/*
@ -205,12 +206,16 @@ enum {
* CAP_ANY - Any user can enable for perf
* NO_SET_FILTER - Set when filter has error and is to be ignored
* IGNORE_ENABLE - For ftrace internal events, do not enable with debugfs file
* WAS_ENABLED - Set and stays set when an event was ever enabled
* (used for module unloading, if a module event is enabled,
* it is best to clear the buffers that used it).
*/
enum {
TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
};
struct ftrace_event_call {

12
kernel/trace/trace_events.c
View File

@ -245,6 +245,9 @@ static int ftrace_event_enable_disable(struct ftrace_event_file *file,
break;
}
file->flags |= FTRACE_EVENT_FL_ENABLED;
/* WAS_ENABLED gets set but never cleared. */
call->flags |= TRACE_EVENT_FL_WAS_ENABLED;
}
break;
}
@ -1626,12 +1629,13 @@ static void trace_module_remove_events(struct module *mod)
{
struct ftrace_module_file_ops *file_ops;
struct ftrace_event_call *call, *p;
bool found = false;
bool clear_trace = false;
down_write(&trace_event_mutex);
list_for_each_entry_safe(call, p, &ftrace_events, list) {
if (call->mod == mod) {
found = true;
if (call->flags & TRACE_EVENT_FL_WAS_ENABLED)
clear_trace = true;
__trace_remove_event_call(call);
}
}
@ -1648,9 +1652,9 @@ static void trace_module_remove_events(struct module *mod)
/*
* It is safest to reset the ring buffer if the module being unloaded
* registered any events.
* registered any events that were used.
*/
if (found)
if (clear_trace)
tracing_reset_current_online_cpus();
up_write(&trace_event_mutex);
}