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tracing/filters: Add __field_ext() to TRACE_EVENT

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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>
This commit is contained in:
Li Zefan 2009-08-07 10:33:22 +08:00 committed by Steven Rostedt
parent aa38e9fc3e
commit 43b51ead3f
6 changed files with 49 additions and 22 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
include/linux/ftrace_event.h
View file

@ -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)

29
include/trace/ftrace.h
View file

@ -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" \
@ -265,20 +274,24 @@ 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;
@ -286,7 +299,8 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
#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);
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)

9
kernel/trace/trace_events.c
View file

@ -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;
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;

6
kernel/trace/trace_events_filter.c
View file

@ -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"))

8
kernel/trace/trace_export.c
View file

@ -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;

6
kernel/trace/trace_syscalls.c
View file

@ -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;
}