tracing/perf: Avoid perf_trace_buf_*() in perf_trace_##call() when possible

perf_trace_buf_prepare() + perf_trace_buf_submit(task => NULL)
make no sense if hlist_empty(head). Change perf_trace_##call()
to check ->perf_events beforehand and do nothing if it is empty.

This removes the overhead for tasks without events associated
with them. For example, "perf record -e sched:sched_switch -p1"
attaches the counter(s) to the single task, but every task in
system will do perf_trace_buf_prepare/submit() just to realize
that it was not attached to this event.

However, we can only do this if __task == NULL, so we also add
the __builtin_constant_p(__task) check.

With this patch "perf bench sched pipe" shows approximately 4%
improvement when "perf record -p1" runs in parallel, many thanks
to Steven for the testing.

Link: http://lkml.kernel.org/r/20130806160847.GA2746@redhat.com

Tested-by: David Ahern <dsahern@gmail.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 4163d93ccf38..5c7ab17cbb02 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -667,6 +667,12 @@ perf_trace_##call(void *__data, proto)					\
         int rctx;                                                       \
                                                                         \
         __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
+                                                                        \
+        head = this_cpu_ptr(event_call->perf_events);                   \
+        if (__builtin_constant_p(!__task) && !__task &&                 \
+                                hlist_empty(head))                      \
+                return;                                                 \
+                                                                        \
         __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
                              sizeof(u64));                              \
         __entry_size -= sizeof(u32);                                    \
@@ -681,7 +687,6 @@ perf_trace_##call(void *__data, proto)					\
                                                                         \
         { assign; }                                                     \
                                                                         \
-        head = this_cpu_ptr(event_call->perf_events);                   \
         perf_trace_buf_submit(entry, __entry_size, rctx, __addr,        \
                 __count, &__regs, head, __task);                        \
 }