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ftrace: Allow to specify filter field type for ftrace events
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Adding FILTER_TRACE_FN event field type for function tracepoint
event, so it can be properly recognized within filtering code.

Currently all fields of ftrace subsystem events share the common
field type FILTER_OTHER. Since the function trace fields need
special care within the filtering code we need to recognize it
properly, hence adding the FILTER_TRACE_FN event type.

Adding filter parameter to the FTRACE_ENTRY macro, to specify the
filter field type for the event.

Link: http://lkml.kernel.org/r/1329317514-8131-7-git-send-email-jolsa@redhat.com

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Jiri Olsa authored and Steven Rostedt committed Feb 21, 2012
1 parent ced3900 commit 02aa316
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Showing 5 changed files with 83 additions and 47 deletions.
1 change: 1 addition & 0 deletions include/linux/ftrace_event.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -245,6 +245,7 @@ enum {
FILTER_STATIC_STRING,
FILTER_DYN_STRING,
FILTER_PTR_STRING,
FILTER_TRACE_FN,
};

#define EVENT_STORAGE_SIZE 128
Expand Down
23 changes: 13 additions & 10 deletions kernel/trace/trace.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -56,21 +56,23 @@ enum trace_type {
#define F_STRUCT(args...) args

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
struct struct_name { \
struct trace_entry ent; \
tstruct \
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
struct struct_name { \
struct trace_entry ent; \
tstruct \
}

#undef TP_ARGS
#define TP_ARGS(args...) args

#undef FTRACE_ENTRY_DUP
#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)

#undef FTRACE_ENTRY_REG
#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
filter, regfn) \
FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
filter)

#include "trace_entries.h"

Expand Down Expand Up @@ -826,12 +828,13 @@ extern const char *__start___trace_bprintk_fmt[];
extern const char *__stop___trace_bprintk_fmt[];

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
#define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
extern struct ftrace_event_call \
__attribute__((__aligned__(4))) event_##call;
#undef FTRACE_ENTRY_DUP
#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
filter)
#include "trace_entries.h"

#ifdef CONFIG_PERF_EVENTS
Expand Down
48 changes: 35 additions & 13 deletions kernel/trace/trace_entries.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,8 @@ FTRACE_ENTRY_REG(function, ftrace_entry,

F_printk(" %lx <-- %lx", __entry->ip, __entry->parent_ip),

FILTER_TRACE_FN,

perf_ftrace_event_register
);

Expand All @@ -80,7 +82,9 @@ FTRACE_ENTRY(funcgraph_entry, ftrace_graph_ent_entry,
__field_desc( int, graph_ent, depth )
),

F_printk("--> %lx (%d)", __entry->func, __entry->depth)
F_printk("--> %lx (%d)", __entry->func, __entry->depth),

FILTER_OTHER
);

/* Function return entry */
Expand All @@ -100,7 +104,9 @@ FTRACE_ENTRY(funcgraph_exit, ftrace_graph_ret_entry,
F_printk("<-- %lx (%d) (start: %llx end: %llx) over: %d",
__entry->func, __entry->depth,
__entry->calltime, __entry->rettime,
__entry->depth)
__entry->depth),

FILTER_OTHER
);

/*
Expand Down Expand Up @@ -129,8 +135,9 @@ FTRACE_ENTRY(context_switch, ctx_switch_entry,
F_printk("%u:%u:%u ==> %u:%u:%u [%03u]",
__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
__entry->next_pid, __entry->next_prio, __entry->next_state,
__entry->next_cpu
)
__entry->next_cpu),

FILTER_OTHER
);

/*
Expand All @@ -148,8 +155,9 @@ FTRACE_ENTRY_DUP(wakeup, ctx_switch_entry,
F_printk("%u:%u:%u ==+ %u:%u:%u [%03u]",
__entry->prev_pid, __entry->prev_prio, __entry->prev_state,
__entry->next_pid, __entry->next_prio, __entry->next_state,
__entry->next_cpu
)
__entry->next_cpu),

FILTER_OTHER
);

/*
Expand All @@ -171,7 +179,9 @@ FTRACE_ENTRY(kernel_stack, stack_entry,
"\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n",
__entry->caller[0], __entry->caller[1], __entry->caller[2],
__entry->caller[3], __entry->caller[4], __entry->caller[5],
__entry->caller[6], __entry->caller[7])
__entry->caller[6], __entry->caller[7]),

FILTER_OTHER
);

FTRACE_ENTRY(user_stack, userstack_entry,
Expand All @@ -187,7 +197,9 @@ FTRACE_ENTRY(user_stack, userstack_entry,
"\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n\t=> (%08lx)\n",
__entry->caller[0], __entry->caller[1], __entry->caller[2],
__entry->caller[3], __entry->caller[4], __entry->caller[5],
__entry->caller[6], __entry->caller[7])
__entry->caller[6], __entry->caller[7]),

FILTER_OTHER
);

/*
Expand All @@ -204,7 +216,9 @@ FTRACE_ENTRY(bprint, bprint_entry,
),

F_printk("%08lx fmt:%p",
__entry->ip, __entry->fmt)
__entry->ip, __entry->fmt),

FILTER_OTHER
);

FTRACE_ENTRY(print, print_entry,
Expand All @@ -217,7 +231,9 @@ FTRACE_ENTRY(print, print_entry,
),

F_printk("%08lx %s",
__entry->ip, __entry->buf)
__entry->ip, __entry->buf),

FILTER_OTHER
);

FTRACE_ENTRY(mmiotrace_rw, trace_mmiotrace_rw,
Expand All @@ -236,7 +252,9 @@ FTRACE_ENTRY(mmiotrace_rw, trace_mmiotrace_rw,

F_printk("%lx %lx %lx %d %x %x",
(unsigned long)__entry->phys, __entry->value, __entry->pc,
__entry->map_id, __entry->opcode, __entry->width)
__entry->map_id, __entry->opcode, __entry->width),

FILTER_OTHER
);

FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
Expand All @@ -254,7 +272,9 @@ FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,

F_printk("%lx %lx %lx %d %x",
(unsigned long)__entry->phys, __entry->virt, __entry->len,
__entry->map_id, __entry->opcode)
__entry->map_id, __entry->opcode),

FILTER_OTHER
);


Expand All @@ -274,6 +294,8 @@ FTRACE_ENTRY(branch, trace_branch,

F_printk("%u:%s:%s (%u)",
__entry->line,
__entry->func, __entry->file, __entry->correct)
__entry->func, __entry->file, __entry->correct),

FILTER_OTHER
);

7 changes: 6 additions & 1 deletion kernel/trace/trace_events_filter.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -899,6 +899,11 @@ int filter_assign_type(const char *type)
return FILTER_OTHER;
}

static bool is_function_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_TRACE_FN;
}

static bool is_string_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_DYN_STRING ||
Expand Down Expand Up @@ -986,7 +991,7 @@ static int init_pred(struct filter_parse_state *ps,
fn = filter_pred_strloc;
else
fn = filter_pred_pchar;
} else {
} else if (!is_function_field(field)) {
if (field->is_signed)
ret = strict_strtoll(pred->regex.pattern, 0, &val);
else
Expand Down
51 changes: 28 additions & 23 deletions kernel/trace/trace_export.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,10 @@
* function and thus become accesible via perf.
*/
#undef FTRACE_ENTRY_REG
#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, regfn) \
FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
#define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
filter, regfn) \
FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
filter)

/* not needed for this file */
#undef __field_struct
Expand Down Expand Up @@ -52,21 +54,22 @@
#define F_printk(fmt, args...) fmt, args

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
struct ____ftrace_##name { \
tstruct \
}; \
static void __always_unused ____ftrace_check_##name(void) \
{ \
struct ____ftrace_##name *__entry = NULL; \
\
/* force compile-time check on F_printk() */ \
printk(print); \
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
struct ____ftrace_##name { \
tstruct \
}; \
static void __always_unused ____ftrace_check_##name(void) \
{ \
struct ____ftrace_##name *__entry = NULL; \
\
/* force compile-time check on F_printk() */ \
printk(print); \
}

#undef FTRACE_ENTRY_DUP
#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print) \
FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print))
#define FTRACE_ENTRY_DUP(name, struct_name, id, tstruct, print, filter) \
FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
filter)

#include "trace_entries.h"

Expand All @@ -75,7 +78,7 @@ static void __always_unused ____ftrace_check_##name(void) \
ret = trace_define_field(event_call, #type, #item, \
offsetof(typeof(field), item), \
sizeof(field.item), \
is_signed_type(type), FILTER_OTHER); \
is_signed_type(type), filter_type); \
if (ret) \
return ret;

Expand All @@ -85,7 +88,7 @@ static void __always_unused ____ftrace_check_##name(void) \
offsetof(typeof(field), \
container.item), \
sizeof(field.container.item), \
is_signed_type(type), FILTER_OTHER); \
is_signed_type(type), filter_type); \
if (ret) \
return ret;

Expand All @@ -99,7 +102,7 @@ static void __always_unused ____ftrace_check_##name(void) \
ret = trace_define_field(event_call, event_storage, #item, \
offsetof(typeof(field), item), \
sizeof(field.item), \
is_signed_type(type), FILTER_OTHER); \
is_signed_type(type), filter_type); \
mutex_unlock(&event_storage_mutex); \
if (ret) \
return ret; \
Expand All @@ -112,25 +115,26 @@ static void __always_unused ____ftrace_check_##name(void) \
offsetof(typeof(field), \
container.item), \
sizeof(field.container.item), \
is_signed_type(type), FILTER_OTHER); \
is_signed_type(type), filter_type); \
if (ret) \
return ret;

#undef __dynamic_array
#define __dynamic_array(type, item) \
ret = trace_define_field(event_call, #type, #item, \
offsetof(typeof(field), item), \
0, is_signed_type(type), FILTER_OTHER);\
0, is_signed_type(type), filter_type);\
if (ret) \
return ret;

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
#define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
int \
ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
{ \
struct struct_name field; \
int ret; \
int filter_type = filter; \
\
tstruct; \
\
Expand Down Expand Up @@ -161,7 +165,8 @@ ftrace_define_fields_##name(struct ftrace_event_call *event_call) \
#define F_printk(fmt, args...) #fmt ", " __stringify(args)

#undef FTRACE_ENTRY_REG
#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, regfn)\
#define FTRACE_ENTRY_REG(call, struct_name, etype, tstruct, print, filter,\
regfn) \
\
struct ftrace_event_class event_class_ftrace_##call = { \
.system = __stringify(TRACE_SYSTEM), \
Expand All @@ -180,9 +185,9 @@ struct ftrace_event_call __used \
__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call;

#undef FTRACE_ENTRY
#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print, filter) \
FTRACE_ENTRY_REG(call, struct_name, etype, \
PARAMS(tstruct), PARAMS(print), NULL)
PARAMS(tstruct), PARAMS(print), filter, NULL)

int ftrace_event_is_function(struct ftrace_event_call *call)
{
Expand Down

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