sched: Use trace_call__<tp>() to save a static branch

The wrapper functions __trace_set_current_state() and __trace_set_need_resched() allow the tracepoints to be called from code outside sched/core.c, those calls are already guarded by a tracepoint_enabled(<tp>) so there is no need to repeat this check once again inside the call using trace_<tp>(). Use the new trace_call__<tp>() API to directly call the tracepoint without check. Those helper functions must be called after the appropriate check.

Gabriele Monaco committed 6 months ago

Commit 4ac4d651 parent 7fd2df21 file · +11 −3Browse files

Showing the changes to kernel (1 of 1 file). Show all

Unified · Split

kernel/sched/core.c+11−3

 /* need a wrapper since we may need to trace from modules */
 EXPORT_TRACEPOINT_SYMBOL(sched_set_state_tp);
-/* Call via the helper macro trace_set_current_state. */
+/*
+ * Call via the helper macro trace_set_current_state.
+ * Calls to this function MUST be guarded by a
+ * tracepoint_enabled(sched_set_state_tp)
+ */
 void __trace_set_current_state(int state_value)
 {
-	trace_sched_set_state_tp(current, state_value);
+	trace_call__sched_set_state_tp(current, state_value);
 }
 EXPORT_SYMBOL(__trace_set_current_state);
 	}
 }
+/*
+ * Calls to this function MUST be guarded by a
+ * tracepoint_enabled(sched_set_need_resched_tp)
+ */
 void __trace_set_need_resched(struct task_struct *curr, int tif)
 {
-	trace_sched_set_need_resched_tp(curr, smp_processor_id(), tif);
+	trace_call__sched_set_need_resched_tp(curr, smp_processor_id(), tif);
 }
 EXPORT_SYMBOL_GPL(__trace_set_need_resched);