lkml.org 
[lkml]   [2009]   [Dec]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 06/10] tracing: add print_fmt field

Adds print_fmt field to struct ftrace_event_call
and some initialization code. But this field is not used now,
the next patches will use it and replace the ->show_format().

It is preparing patch for new way of printing format files which
uses defined fields and a defined print_fmt to print formats.

How will the new way works(and how print_fmt will be used)?
print name
print ID
print string "format:"
use struct ftrace_event_call->fields to print fields
use struct ftrace_event_call->print_fmt to print "print fmt: XXXXXXXXXXX"

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index f883406..58db567 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -120,6 +120,7 @@ struct ftrace_event_call {
int (*regfunc)(struct ftrace_event_call *);
void (*unregfunc)(struct ftrace_event_call *);
int id;
+ const char *print_fmt;
int (*raw_init)(struct ftrace_event_call *);
int (*show_format)(struct ftrace_event_call *,
struct trace_seq *);
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 54258a0..eb63c97 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -723,8 +723,20 @@ static struct trace_event ftrace_event_type_##call = { \

#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

+#undef __entry
+#define __entry REC
+
+#undef __print_flags
+#undef __print_symbolic
+#undef __get_dynamic_array
+#undef __get_str
+
+#undef TP_printk
+#define TP_printk(fmt, args...) #fmt ", " __stringify(args)
+
#undef DECLARE_EVENT_CLASS
-#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+static const char print_fmt_##call[] = print;

#undef DEFINE_EVENT
#define DEFINE_EVENT(template, call, proto, args) \
@@ -738,6 +750,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
.raw_init = trace_event_raw_init, \
.regfunc = ftrace_raw_reg_event_##call, \
.unregfunc = ftrace_raw_unreg_event_##call, \
+ .print_fmt = print_fmt_##template, \
.show_format = ftrace_format_##template, \
.define_fields = ftrace_define_fields_##template, \
_TRACE_PROFILE_INIT(call) \
@@ -746,6 +759,8 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
\
+static const char print_fmt_##call[] = print; \
+ \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
@@ -755,6 +770,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
.raw_init = trace_event_raw_init, \
.regfunc = ftrace_raw_reg_event_##call, \
.unregfunc = ftrace_raw_unreg_event_##call, \
+ .print_fmt = print_fmt_##call, \
.show_format = ftrace_format_##call, \
.define_fields = ftrace_define_fields_##template, \
_TRACE_PROFILE_INIT(call) \
@@ -838,6 +854,16 @@ __attribute__((section("_ftrace_events"))) event_##call = { \

#ifdef CONFIG_EVENT_PROFILE

+#undef __entry
+#define __entry entry
+
+#undef __get_dynamic_array
+#define __get_dynamic_array(field) \
+ ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
+
+#undef __get_str
+#define __get_str(field) (char *)__get_dynamic_array(field)
+
#undef __perf_addr
#define __perf_addr(a) __addr = (a)

diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 9978a4f..95d14b6 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -203,6 +203,9 @@ static int ftrace_raw_init_event(struct ftrace_event_call *call)
return 0;
}

+#undef __entry
+#define __entry REC
+
#undef __field
#define __field(type, item)

@@ -218,6 +221,9 @@ static int ftrace_raw_init_event(struct ftrace_event_call *call)
#undef __dynamic_array
#define __dynamic_array(type, item)

+#undef F_printk
+#define F_printk(fmt, args...) #fmt ", " __stringify(args)
+
#undef FTRACE_ENTRY
#define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \
\
@@ -228,6 +234,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
.id = type, \
.system = __stringify(TRACE_SYSTEM), \
.raw_init = ftrace_raw_init_event, \
+ .print_fmt = print, \
.show_format = ftrace_format_##call, \
.define_fields = ftrace_define_fields_##call, \
}; \






\
 
 \ /
  Last update: 2009-12-15 08:45    [W:0.274 / U:0.944 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site