From: Steven Rostedt (Red Hat) Date: Wed, 23 Nov 2016 16:36:30 +0000 (-0500) Subject: ring-buffer: Make rb_reserve_next_event() always inlined X-Git-Tag: v4.10-rc1~89^2~19 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fa7ffb39efccd574163ebc5dbfe4ff066186f261;p=karo-tx-linux.git ring-buffer: Make rb_reserve_next_event() always inlined The function rb_reserved_next_event() is called by two functions: ring_buffer_lock_reserve() and ring_buffer_write(). This is in a very hot path of the tracing code, and it is best that they are not functions. The two callers are basically wrapers for rb_reserver_next_event(). Removing the function calls can save execution time in the hotpath of tracing. Link: http://lkml.kernel.org/r/20161121183700.GW26852@two.firstfloor.org Reported-by: Andi Kleen Signed-off-by: Steven Rostedt --- diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 9c143739b8d7..1f3580cee6cc 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2733,7 +2733,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer, return event; } -static struct ring_buffer_event * +static __always_inline struct ring_buffer_event * rb_reserve_next_event(struct ring_buffer *buffer, struct ring_buffer_per_cpu *cpu_buffer, unsigned long length)