tracing: tracepoints for softirq entry/exit - tracepoints

Introduce softirq entry/exit tracepoints. These are useful for
augmenting existing tracers, and to figure out softirq frequencies and
timings.

[
  s/irq_softirq_/softirq_/ for trace point names and
  Fixed printf format in TRACE_FORMAT macro
   - Steven Rostedt
]

LKML-Reference: <20090312183603.GC3352@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/trace/irq_event_types.h b/include/trace/irq_event_types.h
index 214bb928fe9e..85964ebd47ec 100644
--- a/include/trace/irq_event_types.h
+++ b/include/trace/irq_event_types.h
@@ -40,4 +40,16 @@ TRACE_EVENT(irq_handler_exit,
                   __entry->irq, __entry->ret ? "handled" : "unhandled")
 );
 
+TRACE_FORMAT(softirq_entry,
+        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+        TP_ARGS(h, vec),
+        TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec])
+        );
+
+TRACE_FORMAT(softirq_exit,
+        TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
+        TP_ARGS(h, vec),
+        TP_FMT("softirq=%d action=%s", (int)(h - vec), softirq_to_name[h-vec])
+        );
+
 #undef TRACE_SYSTEM