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/linux/trace_events.h b/include/linux/trace_events.h
index 0810f81b..56f795e 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -605,15 +605,15 @@
extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
char *filter_str);
extern void ftrace_profile_free_filter(struct perf_event *event);
-extern void *perf_trace_buf_prepare(int size, unsigned short type,
- struct pt_regs **regs, int *rctxp);
+void perf_trace_buf_update(void *record, u16 type);
+void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
static inline void
-perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
+perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
u64 count, struct pt_regs *regs, void *head,
struct task_struct *task)
{
- perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
+ perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
}
#endif