sched currently hosts three different event notification mechanisms -
tracepoints, perf_event functions and sched_notifiers. The previous
patches modified and moved them around so that they are colocated
where applicable and share most of the arguments. This patch
introduces and uses SCHED_EVENT() and SCHED_EVENT_RQ() to coalesce
calls to different mechanisms.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
---
kernel/sched.c | 51 ++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 40 insertions(+), 11 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index 0b753f0..1acec30 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1439,6 +1439,39 @@ static inline void fire_sched_notifiers_in(struct task_struct *p)
fire_sched_notifiers(in, p);
}
+/*
+ * Sched is watched by three different mechanisms - tracepoint,
+ * perf_event and sched_notifiers. SCHED_EVENT*() can be used to
+ * define all or any part of them at once so that code clutter is kept
+ * to minimum and optimizations can be applied according to different
+ * config options.
+ *
+ * In SCHED_EVENT(), the first three arguments specify the name of
+ * tracepoint, perf_event and sched_notifier. NONE can be used to
+ * omit any subset of the three. The last argument is event arguments
+ * wrapped inside SE_ARGS() macro.
+ *
+ * SCHED_EVENT_RQ() is identical except that @rq argument will be
+ * added to tracepoint and perf calls.
+ */
+#define trace_sched_NONE(args...) do { } while (0)
+#define perf_event_task_NONE(args...) do { } while (0)
+#define fire_sched_notifiers_NONE(args...) do { } while (0)
+
+#define SE_ARGS(args...) args
+
+#define SCHED_EVENT(TP, PERF, SN, args) do ...
