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perf: split perf_trace_buf_prepare into alloc and update parts

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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>
This commit is contained in:
Alexei Starovoitov
2016-04-06 18:43:24 -07:00
committed by David S. Miller
parent e93735be6a
commit 1e1dcd93b4
8 changed files with 49 additions and 42 deletions
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include/linux/perf_event.h
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@@ -1016,7 +1016,7 @@ static inline bool perf_paranoid_kernel(void)
}
extern void perf_event_init(void);
extern void perf_tp_event(u64 addr, u64 count, void *record,
extern 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);