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>

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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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2

include/linux/perf_event.h

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8

include/linux/trace_events.h

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8

include/trace/perf.h

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