perf: Convert perf_event to local_t
Since now all modification to event->count (and ->prev_count
and ->period_left) are local to a cpu, change then to local64_t so we
avoid the LOCK'ed ops.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index f34dab9..7342979 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -487,6 +487,7 @@
#include <linux/cpu.h>
#include <asm/atomic.h>
#include <asm/local.h>
+#include <asm/local64.h>
#define PERF_MAX_STACK_DEPTH 255
@@ -536,10 +537,10 @@
struct arch_hw_breakpoint info;
#endif
};
- atomic64_t prev_count;
+ local64_t prev_count;
u64 sample_period;
u64 last_period;
- atomic64_t period_left;
+ local64_t period_left;
u64 interrupts;
u64 freq_time_stamp;
@@ -670,7 +671,7 @@
enum perf_event_active_state state;
unsigned int attach_state;
- atomic64_t count;
+ local64_t count;
atomic64_t child_count;
/*