perf, bpf: minimize the size of perf_trace_() tracepoint handler

move trace_call_bpf() into helper function to minimize the size
of perf_trace_*() tracepoint handlers.
    text	   data	    bss	    dec	 	   hex	filename
10541679	5526646	2945024	19013349	1221ee5	vmlinux_before
10509422	5526646	2945024	18981092	121a0e4	vmlinux_after

It may seem that perf_fetch_caller_regs() can also be moved,
but that is incorrect, since ip/sp will be wrong.

bpf+tracepoint performance is not affected, since
perf_swevent_put_recursion_context() is now inlined.
export_symbol_gpl can also be dropped.

No measurable change in normal perf tracepoints.

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index fe64412..222f6aa 100644 (file)
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -609,6 +609,11 @@ extern void ftrace_profile_free_filter(struct perf_event *event);
 void perf_trace_buf_update(void *record, u16 type);
 void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
 
+void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
+                              struct trace_event_call *call, u64 count,
+                              struct pt_regs *regs, struct hlist_head *head,
+                              struct task_struct *task);
+
 static inline void
 perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
                       u64 count, struct pt_regs *regs, void *head,

diff --git a/include/trace/perf.h b/include/trace/perf.h
index a182306..88de5c2 100644 (file)
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -64,16 +64,9 @@ perf_trace_##call(void *__data, proto)                                       \
                                                                        \
        { assign; }                                                     \
                                                                        \
-       if (prog) {                                                     \
-               *(struct pt_regs **)entry = __regs;                     \
-               if (!trace_call_bpf(prog, entry) || hlist_empty(head)) { \
-                       perf_swevent_put_recursion_context(rctx);       \
-                       return;                                         \
-               }                                                       \
-       }                                                               \
-       perf_trace_buf_submit(entry, __entry_size, rctx,                \
-                             event_call->event.type, __count, __regs,  \
-                             head, __task);                            \
+       perf_trace_run_bpf_submit(entry, __entry_size, rctx,            \
+                                 event_call, __count, __regs,          \
+                                 head, __task);                        \
 }
 
 /*

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5056abf..9eb23dc 100644 (file)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6741,7 +6741,6 @@ void perf_swevent_put_recursion_context(int rctx)
 
        put_recursion_context(swhash->recursion, rctx);
 }
-EXPORT_SYMBOL_GPL(perf_swevent_put_recursion_context);
 
 void ___perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
 {
@@ -6998,6 +6997,25 @@ static int perf_tp_event_match(struct perf_event *event,
        return 1;
 }
 
+void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
+                              struct trace_event_call *call, u64 count,
+                              struct pt_regs *regs, struct hlist_head *head,
+                              struct task_struct *task)
+{
+       struct bpf_prog *prog = call->prog;
+
+       if (prog) {
+               *(struct pt_regs **)raw_data = regs;
+               if (!trace_call_bpf(prog, raw_data) || hlist_empty(head)) {
+                       perf_swevent_put_recursion_context(rctx);
+                       return;
+               }
+       }
+       perf_tp_event(call->event.type, count, raw_data, size, regs, head,
+                     rctx, task);
+}
+EXPORT_SYMBOL_GPL(perf_trace_run_bpf_submit);
+
 void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
                   struct pt_regs *regs, struct hlist_head *head, int rctx,
                   struct task_struct *task)