tracing: convert irq events to use __print_symbolic

The recording of the names at trace time is inefficient. This patch
implements the softirq event recording to only record the vector
and then use the __print_symbolic interface to print out the names.

[ Impact: faster recording of softirq events ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

1 files changed, 17 insertions, 6 deletions

diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
index 32a9f7ef432b..683fb36a9943 100644
--- a/include/trace/events/irq.h
+++ b/include/trace/events/irq.h
@@ -7,6 +7,19 @@
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM irq
 
+#define softirq_name(sirq) { sirq, #sirq }
+#define show_softirq_name(val)                                          \
+        __print_symbolic(val,                                           \
+                         softirq_name(HI_SOFTIRQ),                      \
+                         softirq_name(TIMER_SOFTIRQ),                   \
+                         softirq_name(NET_TX_SOFTIRQ),                  \
+                         softirq_name(NET_RX_SOFTIRQ),                  \
+                         softirq_name(BLOCK_SOFTIRQ),                   \
+                         softirq_name(TASKLET_SOFTIRQ),                 \
+                         softirq_name(SCHED_SOFTIRQ),                   \
+                         softirq_name(HRTIMER_SOFTIRQ),                 \
+                         softirq_name(RCU_SOFTIRQ))
+
 /**
  * irq_handler_entry - called immediately before the irq action handler
  * @irq: irq number
@@ -87,15 +100,14 @@ TRACE_EVENT(softirq_entry,
 
         TP_STRUCT__entry(
                 __field(        int,    vec                     )
-                __string(       name,   softirq_to_name[h-vec]  )
         ),
 
         TP_fast_assign(
                 __entry->vec = (int)(h - vec);
-                __assign_str(name, softirq_to_name[h-vec]);
         ),
 
-        TP_printk("softirq=%d action=%s", __entry->vec, __get_str(name))
+        TP_printk("softirq=%d action=%s", __entry->vec,
+                  show_softirq_name(__entry->vec))
 );
 
 /**
@@ -117,15 +129,14 @@ TRACE_EVENT(softirq_exit,
 
         TP_STRUCT__entry(
                 __field(        int,    vec                     )
-                __string(       name,   softirq_to_name[h-vec]  )
         ),
 
         TP_fast_assign(
                 __entry->vec = (int)(h - vec);
-                __assign_str(name, softirq_to_name[h-vec]);
         ),
 
-        TP_printk("softirq=%d action=%s", __entry->vec, __get_str(name))
+        TP_printk("softirq=%d action=%s", __entry->vec,
+                  show_softirq_name(__entry->vec))
 );
 
 #endif /*  _TRACE_IRQ_H */