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tracing/filters: distinguish between signed and unsigned fields

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The new filter comparison ops need to be able to distinguish between
signed and unsigned field types, so add an is_signed flag/param to the
event field struct/trace_define_fields().  Also define a simple macro,
is_signed_type() to determine the signedness at compile time, used in the
trace macros.  If the is_signed_type() macro won't work with a specific
type, a new slightly modified version of TRACE_FIELD() called
TRACE_FIELD_SIGN(), allows the signedness to be set explicitly.

[ Impact: extend trace-filter code for new feature ]

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: fweisbec@gmail.com
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1240905893.6416.120.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2009-04-28 03:04:53 -05:00 committed by Ingo Molnar
parent 30e673b230
commit a118e4d140
6 changed files with 39 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/ftrace_event.h
View File

@ -122,8 +122,9 @@ extern int filter_current_check_discard(struct ftrace_event_call *call,
struct ring_buffer_event *event);
extern int trace_define_field(struct ftrace_event_call *call, char *type,
char *name, int offset, int size);
char *name, int offset, int size, int is_signed);
#define is_signed_type(type) (((type)(-1)) < 0)
/*
* The double __builtin_constant_p is because gcc will give us an error
@ -144,10 +145,10 @@ do { \
__trace_printk(ip, fmt, ##args); \
} while (0)
#define __common_field(type, item) \
#define __common_field(type, item, is_signed) \
ret = trace_define_field(event_call, #type, "common_" #item, \
offsetof(typeof(field.ent), item), \
sizeof(field.ent.item)); \
sizeof(field.ent.item), is_signed); \
if (ret) \
return ret;

16
include/trace/ftrace.h
View File

@ -225,7 +225,7 @@ ftrace_format_##call(struct trace_seq *s) \
#define __field(type, item) \
ret = trace_define_field(event_call, #type, #item, \
offsetof(typeof(field), item), \
sizeof(field.item)); \
sizeof(field.item), is_signed_type(type)); \
if (ret) \
return ret;
@ -234,7 +234,7 @@ ftrace_format_##call(struct trace_seq *s) \
BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
ret = trace_define_field(event_call, #type "[" #len "]", #item, \
offsetof(typeof(field), item), \
sizeof(field.item)); \
sizeof(field.item), 0); \
if (ret) \
return ret;
@ -242,7 +242,7 @@ ftrace_format_##call(struct trace_seq *s) \
#define __string(item, src) \
ret = trace_define_field(event_call, "__str_loc", #item, \
offsetof(typeof(field), __str_loc_##item), \
sizeof(field.__str_loc_##item));
sizeof(field.__str_loc_##item), 0);
#undef TRACE_EVENT
#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
@ -253,11 +253,11 @@ ftrace_define_fields_##call(void) \
struct ftrace_event_call *event_call = &event_##call; \
int ret; \
\
__common_field(int, type); \
__common_field(unsigned char, flags); \
__common_field(unsigned char, preempt_count); \
__common_field(int, pid); \
__common_field(int, tgid); \
__common_field(int, type, 1); \
__common_field(unsigned char, flags, 0); \
__common_field(unsigned char, preempt_count, 0); \
__common_field(int, pid, 1); \
__common_field(int, tgid, 1); \
\
tstruct; \
\

1
kernel/trace/trace.h
View File

@ -729,6 +729,7 @@ struct ftrace_event_field {
char *type;
int offset;
int size;
int is_signed;
};
struct event_filter {

4
kernel/trace/trace_event_types.h
View File

@ -141,8 +141,8 @@ TRACE_EVENT_FORMAT(hw_branch, TRACE_HW_BRANCHES, hw_branch_entry, ignore,
TRACE_EVENT_FORMAT(power, TRACE_POWER, trace_power, ignore,
TRACE_STRUCT(
TRACE_FIELD(ktime_t, state_data.stamp, stamp)
TRACE_FIELD(ktime_t, state_data.end, end)
TRACE_FIELD_SIGN(ktime_t, state_data.stamp, stamp, 1)
TRACE_FIELD_SIGN(ktime_t, state_data.end, end, 1)
TRACE_FIELD(int, state_data.type, type)
TRACE_FIELD(int, state_data.state, state)
),

3
kernel/trace/trace_events.c
View File

@ -26,7 +26,7 @@ static DEFINE_MUTEX(event_mutex);
LIST_HEAD(ftrace_events);
int trace_define_field(struct ftrace_event_call *call, char *type,
char *name, int offset, int size)
char *name, int offset, int size, int is_signed)
{
struct ftrace_event_field *field;
@ -44,6 +44,7 @@ int trace_define_field(struct ftrace_event_call *call, char *type,
field->offset = offset;
field->size = size;
field->is_signed = is_signed;
list_add(&field->link, &call->fields);
return 0;

29
kernel/trace/trace_export.c
View File

@ -50,6 +50,9 @@ extern void __bad_type_size(void);
if (!ret) \
return 0;
#undef TRACE_FIELD_SIGN
#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
TRACE_FIELD(type, item, assign)
#undef TP_RAW_FMT
#define TP_RAW_FMT(args...) args
@ -98,6 +101,10 @@ ftrace_format_##call(struct trace_seq *s) \
#define TRACE_FIELD(type, item, assign)\
entry->item = assign;
#undef TRACE_FIELD_SIGN
#define TRACE_FIELD_SIGN(type, item, assign, is_signed) \
TRACE_FIELD(type, item, assign)
#undef TP_CMD
#define TP_CMD(cmd...) cmd
@ -149,7 +156,7 @@ __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)); \
sizeof(field.item), is_signed_type(type)); \
if (ret) \
return ret;
@ -157,7 +164,15 @@ __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)); \
sizeof(field.item), 0); \
if (ret) \
return ret;
#undef TRACE_FIELD_SIGN
#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); \
if (ret) \
return ret;
@ -173,11 +188,11 @@ ftrace_define_fields_##call(void) \
struct args field; \
int ret; \
\
__common_field(unsigned char, type); \
__common_field(unsigned char, flags); \
__common_field(unsigned char, preempt_count); \
__common_field(int, pid); \
__common_field(int, tgid); \
__common_field(unsigned char, type, 0); \
__common_field(unsigned char, flags, 0); \
__common_field(unsigned char, preempt_count, 0); \
__common_field(int, pid, 1); \
__common_field(int, tgid, 1); \
\
tstruct; \
\