perf_counter: software counter event infrastructure

Provide generic software counter infrastructure that supports
software events.

This will be used to allow sample based profiling based on software
events such as pagefaults. The current infrastructure can only
provide a count of such events, no place information.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index dde564517b66..3fefc3b8150d 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -126,6 +126,7 @@ struct hw_perf_counter {
         unsigned long                   counter_base;
         int                             nmi;
         unsigned int                    idx;
+        atomic64_t                      count; /* software */
         atomic64_t                      prev_count;
         u64                             irq_period;
         atomic64_t                      period_left;
@@ -283,6 +284,8 @@ static inline int is_software_counter(struct perf_counter *counter)
         return !counter->hw_event.raw && counter->hw_event.type < 0;
 }
 
+extern void perf_swcounter_event(enum hw_event_types, u64, int, struct pt_regs *);
+
 #else
 static inline void
 perf_counter_task_sched_in(struct task_struct *task, int cpu)           { }
@@ -295,10 +298,13 @@ static inline void perf_counter_exit_task(struct task_struct *child)	{ }
 static inline void perf_counter_notify(struct pt_regs *regs)            { }
 static inline void perf_counter_print_debug(void)                       { }
 static inline void perf_counter_unthrottle(void)                        { }
-static inline void hw_perf_restore(u64 ctrl)                    { }
+static inline void hw_perf_restore(u64 ctrl)                            { }
 static inline u64 hw_perf_save_disable(void)                  { return 0; }
 static inline int perf_counter_task_disable(void)       { return -EINVAL; }
 static inline int perf_counter_task_enable(void)        { return -EINVAL; }
+
+static inline void perf_swcounter_event(enum hw_event_types event, u64 nr,
+                                        int nmi, struct pt_regs *regs)  { }
 #endif
 
 #endif /* __KERNEL__ */