perfcounters: restructure x86 counter math

Impact: restructure code

Change counter math from absolute values to clear delta logic.

We try to extract elapsed deltas from the raw hw counter - and put
that into the generic counter.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 8 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 8cb095fa442c..72460289c654 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -91,14 +91,16 @@ struct perf_counter_hw_event {
  * struct hw_perf_counter - performance counter hardware details:
  */
 struct hw_perf_counter {
+#ifdef CONFIG_PERF_COUNTERS
 	u64				config;
 	unsigned long			config_base;
 	unsigned long			counter_base;
 	int				nmi;
 	unsigned int			idx;
-	u64				prev_count;
+	atomic64_t			prev_count;
 	u64				irq_period;
-	s32				next_count;
+	atomic64_t			period_left;
+#endif
 };
 
 /*
@@ -140,17 +142,15 @@ enum perf_counter_active_state {
  * struct perf_counter - performance counter kernel representation:
  */
 struct perf_counter {
+#ifdef CONFIG_PERF_COUNTERS
 	struct list_head		list_entry;
 	struct list_head		sibling_list;
 	struct perf_counter		*group_leader;
 	const struct hw_perf_counter_ops *hw_ops;
 
 	enum perf_counter_active_state	state;
-#if BITS_PER_LONG == 64
 	atomic64_t			count;
-#else
-	atomic_t			count32[2];
-#endif
+
 	struct perf_counter_hw_event	hw_event;
 	struct hw_perf_counter		hw;
 
@@ -172,6 +172,7 @@ struct perf_counter {
 	struct perf_data		*irqdata;
 	struct perf_data		*usrdata;
 	struct perf_data		data[2];
+#endif
 };
 
 /**
@@ -220,8 +221,6 @@ extern void perf_counter_notify(struct pt_regs *regs);
 extern void perf_counter_print_debug(void);
 extern u64 hw_perf_save_disable(void);
 extern void hw_perf_restore(u64 ctrl);
-extern void atomic64_counter_set(struct perf_counter *counter, u64 val64);
-extern u64 atomic64_counter_read(struct perf_counter *counter);
 extern int perf_counter_task_disable(void);
 extern int perf_counter_task_enable(void);