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Subject[RFC][PATCH 08/17 v2] tracing/samples: Update the trace-event-sample.h with TRACE_DEFINE_ENUM()
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>

Document the use of TRACE_DEFINE_ENUM() by adding enums to the
trace-event-sample.h and using this macro to convert them in the format
files.

Also update the comments and sho the use of __print_symbolic() and
__print_flags() as well as adding comments abount __print_array().

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
samples/trace_events/trace-events-sample.h | 64 +++++++++++++++++++++++++++++-
1 file changed, 63 insertions(+), 1 deletion(-)

diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index 19405f18cc8a..8965d1bb8811 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -198,8 +198,30 @@ static inline int __length_of(const int *list)
;
return i;
}
+
+enum {
+ TRACE_SAMPLE_FOO = 2,
+ TRACE_SAMPLE_BAR = 4,
+ TRACE_SAMPLE_ZOO = 8,
+};
#endif

+/*
+ * If enums are used in the TP_printk(), their names will be shown in
+ * format files and not their values. This can cause problems with user
+ * space programs that parse the format files to know how to translate
+ * the raw binary trace output into human readable text.
+ *
+ * To help out user space programs, any enum that is used in the TP_printk()
+ * should be defined by TRACE_DEFINE_ENUM() macro. All that is needed to
+ * be done is to add this macro with the enum within it in the trace
+ * header file, and it will be converted in the output.
+ */
+
+TRACE_DEFINE_ENUM(TRACE_SAMPLE_FOO);
+TRACE_DEFINE_ENUM(TRACE_SAMPLE_BAR);
+TRACE_DEFINE_ENUM(TRACE_SAMPLE_ZOO);
+
TRACE_EVENT(foo_bar,

TP_PROTO(const char *foo, int bar, const int *lst,
@@ -224,7 +246,47 @@ TRACE_EVENT(foo_bar,
__assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus());
),

- TP_printk("foo %s %d %s %s (%s)", __entry->foo, __entry->bar,
+ TP_printk("foo %s %d %s %s %s %s (%s)", __entry->foo, __entry->bar,
+
+/*
+ * Notice here the use of some helper functions. This includes:
+ *
+ * __print_symbolic( variable, { value, "string" }, ... ),
+ *
+ * The variable is tested against each value of the { } pair. If
+ * the variable matches one of the values, then it will print the
+ * string in that pair. If non are matched, it returns a string
+ * version of the number (if __entry->bar == 7 then "7" is returned).
+ */
+ __print_symbolic(__entry->bar,
+ { 0, "zero" },
+ { TRACE_SAMPLE_FOO, "TWO" },
+ { TRACE_SAMPLE_BAR, "FOUR" },
+ { TRACE_SAMPLE_ZOO, "EIGHT" },
+ { 10, "TEN" }
+ ),
+
+/*
+ * __print_flags( variable, "delim", { value, "flag" }, ... ),
+ *
+ * This is similar to __print_symbolic, except that it tests the bits
+ * of the value. If ((FLAG & variable) == FLAG) then the string is
+ * printed. If more than one flag matches, then each one that does is
+ * also printed with delim in between them.
+ * If not all bits are accounted for, then the not found bits will be
+ * added in hex format: 0x506 will show BIT2|BIT4|0x500
+ */
+ __print_flags(__entry->bar, "|",
+ { 1, "BIT1" },
+ { 2, "BIT2" },
+ { 4, "BIT3" },
+ { 8, "BIT4" }
+ ),
+/*
+ * __print_array( array, len, element_size )
+ *
+ * This prints out the array that is defined by __array in a nice format.
+ */
__print_array(__get_dynamic_array(list),
__get_dynamic_array_len(list),
sizeof(int)),
--
2.1.4



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