ring-buffer: Make write slow path out of line

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Gcc inlines the slow path of the ring buffer write which can
hurt performance. This patch simply forces the slow path function
rb_move_tail() to always be a function.

The ring_buffer_benchmark module with reader_disabled=1 shows that
this patch changes the time to record an event from 135 ns to
132 ns. (3 ns or 2.22% improvement)

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Steven Rostedt 2010-10-08 13:51:48 -04:00 • committed by Steven Rostedt

parent 51ea8a88aa

commit 747e94ae3d

1 changed files with 5 additions and 2 deletions

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7

kernel/trace/ring_buffer.c

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