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SubjectRe: [PATCH net-next] perf, bpf: minimize the size of perf_trace_() tracepoint handler
On Mon, Apr 18, 2016 at 08:11:50PM -0700, Alexei Starovoitov wrote:
> move trace_call_bpf() into helper function to minimize the size
> of perf_trace_*() tracepoint handlers.
> text data bss dec hex filename
> 10541679 5526646 2945024 19013349 1221ee5 vmlinux_before
> 10509422 5526646 2945024 18981092 121a0e4 vmlinux_after
>
> It may seem that perf_fetch_caller_regs() can also be moved,
> but that is incorrect, since ip/sp will be wrong.
>
> bpf+tracepoint performance is not affected, since
> perf_swevent_put_recursion_context() is now inlined.
> export_symbol_gpl can also be dropped.
>
> No measurable change in normal perf tracepoints.
>
> Suggested-by: Steven Rostedt <rostedt@goodmis.org>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
> ---
> include/linux/trace_events.h | 5 +++++
> include/trace/perf.h | 13 +++----------
> kernel/events/core.c | 20 +++++++++++++++++++-
> 3 files changed, 27 insertions(+), 11 deletions(-)
>

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

David, please take through the net tree as this depends on prior patches
by Alexei that are already in your tree.

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