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tracing: Separate out trace events from global variables

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The trace events for ftrace are all defined via global variables.
The arrays of events and event systems are linked to a global list.
This prevents multiple users of the event system (what to enable and
what not to).

By adding descriptors to represent the event/file relation, as well
as to which trace_array descriptor they are associated with, allows
for more than one set of events to be defined. Once the trace events
files have a link between the trace event and the trace_array they
are associated with, we can create multiple trace_arrays that can
record separate events in separate buffers.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt
2012-05-03 23:09:03 -04:00
committed by Steven Rostedt
parent 613f04a0f5
commit ae63b31e4d
6 changed files with 622 additions and 260 deletions
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39
kernel/trace/trace.h
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@@ -158,13 +158,39 @@ struct trace_array_cpu {
*/
struct trace_array {
struct ring_buffer *buffer;
struct list_head list;
int cpu;
int buffer_disabled;
unsigned int flags;
cycle_t time_start;
struct dentry *dir;
struct dentry *event_dir;
struct list_head systems;
struct list_head events;
struct task_struct *waiter;
struct trace_array_cpu *data[NR_CPUS];
};
enum {
TRACE_ARRAY_FL_GLOBAL = (1 << 0)
};
extern struct list_head ftrace_trace_arrays;
/*
* The global tracer (top) should be the first trace array added,
* but we check the flag anyway.
*/
static inline struct trace_array *top_trace_array(void)
{
struct trace_array *tr;
tr = list_entry(ftrace_trace_arrays.prev,
typeof(*tr), list);
WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
return tr;
}
#define FTRACE_CMP_TYPE(var, type) \
__builtin_types_compatible_p(typeof(var), type *)
@@ -851,12 +877,19 @@ struct event_filter {
struct event_subsystem {
struct list_head list;
const char *name;
struct dentry *entry;
struct event_filter *filter;
int nr_events;
int ref_count;
};
struct ftrace_subsystem_dir {
struct list_head list;
struct event_subsystem *subsystem;
struct trace_array *tr;
struct dentry *entry;
int ref_count;
int nr_events;
};
#define FILTER_PRED_INVALID ((unsigned short)-1)
#define FILTER_PRED_IS_RIGHT (1 << 15)
#define FILTER_PRED_FOLD (1 << 15)
@@ -914,7 +947,7 @@ extern void print_event_filter(struct ftrace_event_call *call,
struct trace_seq *s);
extern int apply_event_filter(struct ftrace_event_call *call,
char *filter_string);
extern int apply_subsystem_event_filter(struct event_subsystem *system,
extern int apply_subsystem_event_filter(struct ftrace_subsystem_dir *dir,
char *filter_string);
extern void print_subsystem_event_filter(struct event_subsystem *system,
struct trace_seq *s);