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Subject[tip:tracing/core] tracing/filters: Add __field_ext() to TRACE_EVENT
Commit-ID:  43b51ead3f752a3935116e5b1a94254b8573734f
Gitweb: http://git.kernel.org/tip/43b51ead3f752a3935116e5b1a94254b8573734f
Author: Li Zefan <lizf@cn.fujitsu.com>
AuthorDate: Fri, 7 Aug 2009 10:33:22 +0800
Committer: Steven Rostedt <rostedt@goodmis.org>
CommitDate: Wed, 26 Aug 2009 00:32:06 -0400

tracing/filters: Add __field_ext() to TRACE_EVENT

Add __field_ext(), so a field can be assigned to a specific
filter_type, which matches a corresponding filter function.

For example, a later patch will allow this:
__field_ext(const char *, str, FILTER_PTR_STR);

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A7B9272.6050709@cn.fujitsu.com>

[
Fixed a -1 to FILTER_OTHER
Forward ported to latest kernel.
]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>


---
include/linux/ftrace_event.h | 9 ++++++++-
include/trace/ftrace.h | 31 ++++++++++++++++++++++++-------
kernel/trace/trace_events.c | 11 ++++++++---
kernel/trace/trace_events_filter.c | 6 ------
kernel/trace/trace_export.c | 8 +++++---
kernel/trace/trace_syscalls.c | 6 ++++--
6 files changed, 49 insertions(+), 22 deletions(-)
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index df5b085..0440bea 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -140,9 +140,16 @@ extern int filter_current_check_discard(struct ftrace_event_call *call,
void *rec,
struct ring_buffer_event *event);

+enum {
+ FILTER_OTHER = 0,
+ FILTER_STATIC_STRING,
+ FILTER_DYN_STRING,
+};
+
extern int trace_define_field(struct ftrace_event_call *call,
const char *type, const char *name,
- int offset, int size, int is_signed);
+ int offset, int size, int is_signed,
+ int filter_type);
extern int trace_define_common_fields(struct ftrace_event_call *call);

#define is_signed_type(type) (((type)(-1)) < 0)
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 1274002..1b1f742 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -21,6 +21,9 @@
#undef __field
#define __field(type, item) type item;

+#undef __field_ext
+#define __field_ext(type, item, filter_type) type item;
+
#undef __array
#define __array(type, item, len) type item[len];

@@ -62,7 +65,10 @@
*/

#undef __field
-#define __field(type, item);
+#define __field(type, item)
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)

#undef __array
#define __array(type, item, len)
@@ -110,6 +116,9 @@
if (!ret) \
return 0;

+#undef __field_ext
+#define __field_ext(type, item, filter_type) __field(type, item)
+
#undef __array
#define __array(type, item, len) \
ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
@@ -265,28 +274,33 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \

#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)

-#undef __field
-#define __field(type, item) \
+#undef __field_ext
+#define __field_ext(type, item, filter_type) \
ret = trace_define_field(event_call, #type, #item, \
offsetof(typeof(field), item), \
- sizeof(field.item), is_signed_type(type)); \
+ sizeof(field.item), \
+ is_signed_type(type), filter_type); \
if (ret) \
return ret;

+#undef __field
+#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
+
#undef __array
#define __array(type, item, len) \
BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
ret = trace_define_field(event_call, #type "[" #len "]", #item, \
offsetof(typeof(field), item), \
- sizeof(field.item), 0); \
+ sizeof(field.item), 0, FILTER_OTHER); \
if (ret) \
return ret;

#undef __dynamic_array
#define __dynamic_array(type, item, len) \
ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
- offsetof(typeof(field), __data_loc_##item), \
- sizeof(field.__data_loc_##item), 0);
+ offsetof(typeof(field), __data_loc_##item), \
+ sizeof(field.__data_loc_##item), 0, \
+ FILTER_OTHER);

#undef __string
#define __string(item, src) __dynamic_array(char, item, -1)
@@ -320,6 +334,9 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
#undef __field
#define __field(type, item)

+#undef __field_ext
+#define __field_ext(type, item, filter_type)
+
#undef __array
#define __array(type, item, len)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 5740e90..d33bcde 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -28,7 +28,8 @@ DEFINE_MUTEX(event_mutex);
LIST_HEAD(ftrace_events);

int trace_define_field(struct ftrace_event_call *call, const char *type,
- const char *name, int offset, int size, int is_signed)
+ const char *name, int offset, int size, int is_signed,
+ int filter_type)
{
struct ftrace_event_field *field;

@@ -44,7 +45,11 @@ int trace_define_field(struct ftrace_event_call *call, const char *type,
if (!field->type)
goto err;

- field->filter_type = filter_assign_type(type);
+ if (filter_type == FILTER_OTHER)
+ field->filter_type = filter_assign_type(type);
+ else
+ field->filter_type = filter_type;
+
field->offset = offset;
field->size = size;
field->is_signed = is_signed;
@@ -68,7 +73,7 @@ EXPORT_SYMBOL_GPL(trace_define_field);
ret = trace_define_field(call, #type, "common_" #item, \
offsetof(typeof(ent), item), \
sizeof(ent.item), \
- is_signed_type(type)); \
+ is_signed_type(type), FILTER_OTHER); \
if (ret) \
return ret;

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 22e6d82..8a8e576 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -475,12 +475,6 @@ static int filter_add_pred_fn(struct filter_parse_state *ps,
return 0;
}

-enum {
- FILTER_OTHER = 0,
- FILTER_STATIC_STRING,
- FILTER_DYN_STRING,
-};
-
int filter_assign_type(const char *type)
{
if (strstr(type, "__data_loc") && strstr(type, "char"))
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 7087530..029a91f 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -158,7 +158,8 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#define TRACE_FIELD(type, item, assign) \
ret = trace_define_field(event_call, #type, #item, \
offsetof(typeof(field), item), \
- sizeof(field.item), is_signed_type(type)); \
+ sizeof(field.item), \
+ is_signed_type(type), FILTER_OTHER); \
if (ret) \
return ret;

@@ -166,7 +167,7 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#define TRACE_FIELD_SPECIAL(type, item, len, cmd) \
ret = trace_define_field(event_call, #type "[" #len "]", #item, \
offsetof(typeof(field), item), \
- sizeof(field.item), 0); \
+ sizeof(field.item), 0, FILTER_OTHER); \
if (ret) \
return ret;

@@ -174,7 +175,8 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
ret = trace_define_field(event_call, #type, #item, \
offsetof(typeof(field), item), \
- sizeof(field.item), is_signed); \
+ sizeof(field.item), is_signed, \
+ FILTER_OTHER); \
if (ret) \
return ret;

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 46c1b97..97a2454 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -194,7 +194,8 @@ int syscall_enter_define_fields(struct ftrace_event_call *call)
for (i = 0; i < meta->nb_args; i++) {
ret = trace_define_field(call, meta->types[i],
meta->args[i], offset,
- sizeof(unsigned long), 0);
+ sizeof(unsigned long), 0,
+ FILTER_OTHER);
offset += sizeof(unsigned long);
}

@@ -210,7 +211,8 @@ int syscall_exit_define_fields(struct ftrace_event_call *call)
if (ret)
return ret;

- ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0);
+ ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0,
+ FILTER_OTHER);

return ret;
}

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