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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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8
include/trace/perf.h
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@ -53,8 +53,7 @@ perf_trace_##call(void *__data, proto) \
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 @@ perf_trace_##call(void *__data, proto) \
\
{ 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); \
}
/*