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ring-buffer: Micro-optimize with some strategic inlining

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By using inline and noinline, we are able to make the fast path of
recording an event 4% faster.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2010-10-19 13:17:08 -04:00 committed by Steven Rostedt
parent 140ff89127
commit d9abde2138
1 changed files with 15 additions and 8 deletions
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23
kernel/trace/ring_buffer.c
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@ -2078,7 +2078,7 @@ static void rb_start_commit(struct ring_buffer_per_cpu *cpu_buffer)
local_inc(&cpu_buffer->commits); local_inc(&cpu_buffer->commits);
} }
static void rb_end_commit(struct ring_buffer_per_cpu *cpu_buffer) static inline void rb_end_commit(struct ring_buffer_per_cpu *cpu_buffer)
{ {
unsigned long commits; unsigned long commits;
@ -2193,13 +2193,9 @@ rb_reserve_next_event(struct ring_buffer *buffer,
#define TRACE_RECURSIVE_DEPTH 16 #define TRACE_RECURSIVE_DEPTH 16
static int trace_recursive_lock(void) /* Keep this code out of the fast path cache */
static noinline void trace_recursive_fail(void)
{ {
current->trace_recursion++;
if (likely(current->trace_recursion < TRACE_RECURSIVE_DEPTH))
return 0;
/* Disable all tracing before we do anything else */ /* Disable all tracing before we do anything else */
tracing_off_permanent(); tracing_off_permanent();
@ -2211,10 +2207,21 @@ static int trace_recursive_lock(void)
in_nmi()); in_nmi());
WARN_ON_ONCE(1); WARN_ON_ONCE(1);
}
static inline int trace_recursive_lock(void)
{
current->trace_recursion++;
if (likely(current->trace_recursion < TRACE_RECURSIVE_DEPTH))
return 0;
trace_recursive_fail();
return -1; return -1;
} }
static void trace_recursive_unlock(void) static inline void trace_recursive_unlock(void)
{ {
WARN_ON_ONCE(!current->trace_recursion); WARN_ON_ONCE(!current->trace_recursion);