perf: split perf_trace_buf_prepare into alloc and update parts
split allows to move expensive update of 'struct trace_entry' to later phase.
Repurpose unused 1st argument of perf_tp_event() to indicate event type.
While splitting use temp variable 'rctx' instead of '*rctx' to avoid
unnecessary loads done by the compiler due to -fno-strict-aliasing
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/trace/perf.h b/include/trace/perf.h
index 6f7e378..77cd904 100644
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -53,8 +53,7 @@
sizeof(u64)); \
__entry_size -= sizeof(u32); \
\
- entry = perf_trace_buf_prepare(__entry_size, \
- event_call->event.type, &__regs, &rctx); \
+ entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx); \
if (!entry) \
return; \
\
@@ -64,8 +63,9 @@
\
{ assign; } \
\
- perf_trace_buf_submit(entry, __entry_size, rctx, 0, \
- __count, __regs, head, __task); \
+ perf_trace_buf_submit(entry, __entry_size, rctx, \
+ event_call->event.type, __count, __regs, \
+ head, __task); \
}
/*