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

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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>
This commit is contained in:
Alexei Starovoitov 2016-04-18 20:11:50 -07:00 • committed by David S. Miller
parent c60c984042
commit 85b67bcb7e
3 changed files with 27 additions and 11 deletions
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13
include/trace/perf.h
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@ -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); \
}
/*