perf/ftrace: Optimize perf/tracepoint interaction for single events

When we've got but a single event per tracepoint
there is no reason to try and multiplex it so don't.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 8 insertions, 5 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index c0f4b364c71..c8091001b94 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -132,6 +132,7 @@ struct ftrace_event_call {
         void                    *data;
 
         int                     perf_refcount;
+        void                    *perf_data;
         int                     (*perf_event_enable)(struct ftrace_event_call *);
         void                    (*perf_event_disable)(struct ftrace_event_call *);
 };
@@ -190,7 +191,7 @@ struct perf_event;
 
 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
 
-extern int perf_trace_enable(int event_id);
+extern int perf_trace_enable(int event_id, void *data);
 extern void perf_trace_disable(int event_id);
 extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
                                      char *filter_str);
@@ -201,11 +202,12 @@ perf_trace_buf_prepare(int size, unsigned short type, int *rctxp,
 
 static inline void
 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
-                       u64 count, unsigned long irq_flags, struct pt_regs *regs)
+                       u64 count, unsigned long irq_flags, struct pt_regs *regs,
+                       void *event)
 {
         struct trace_entry *entry = raw_data;
 
-        perf_tp_event(entry->type, addr, count, raw_data, size, regs);
+        perf_tp_event(entry->type, addr, count, raw_data, size, regs, event);
         perf_swevent_put_recursion_context(rctx);
         local_irq_restore(irq_flags);
 }
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 3fd5c82e0e1..0b521fc8f5b 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -994,7 +994,7 @@ static inline bool perf_paranoid_kernel(void)
 
 extern void perf_event_init(void);
 extern void perf_tp_event(int event_id, u64 addr, u64 count, void *record,
-                          int entry_size, struct pt_regs *regs);
+                          int entry_size, struct pt_regs *regs, void *event);
 extern void perf_bp_event(struct perf_event *event, void *data);
 
 #ifndef perf_misc_flags
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 882c64832ff..0a29df09292 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -785,7 +785,8 @@ perf_trace_templ_##call(struct ftrace_event_call *event_call,		\
         { assign; }                                                     \
                                                                         \
         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
-                               __count, irq_flags, __regs);             \
+                               __count, irq_flags, __regs,              \
+                              event_call->perf_data);                   \
 }
 
 #undef DEFINE_EVENT