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tracing/syscalls: Add filtering support

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Add filtering support for syscall events:

 # echo 'mode == 0666' > events/syscalls/sys_enter_open
 # echo 'ret == 0' > events/syscalls/sys_exit_open
 # echo 1 > events/syscalls/sys_enter_open
 # echo 1 > events/syscalls/sys_exit_open
 # cat trace
 ...
   modprobe-3084 [001] 117.463140: sys_open(filename: 917d3e8, flags: 0, mode: 1b6)
   modprobe-3084 [001] 117.463176: sys_open -> 0x0
       less-3086 [001] 117.510455: sys_open(filename: 9c6bdb8, flags: 8000, mode: 1b6)
   sendmail-2574 [001] 122.145840: sys_open(filename: b807a365, flags: 0, mode: 1b6)
 ...

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A8BAFCB.1040006@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-08-19 15:54:51 +08:00 committed by Ingo Molnar
parent e647d6b314
commit 540b7b8d65
5 changed files with 71 additions and 13 deletions
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5
include/linux/ftrace_event.h
View file

@ -140,8 +140,9 @@ extern int filter_current_check_discard(struct ftrace_event_call *call,
void *rec,
struct ring_buffer_event *event);
extern int trace_define_field(struct ftrace_event_call *call, char *type,
char *name, int offset, int size, int is_signed);
extern int trace_define_field(struct ftrace_event_call *call,
const char *type, const char *name,
int offset, int size, int is_signed);
extern int trace_define_common_fields(struct ftrace_event_call *call);
#define is_signed_type(type) (((type)(-1)) < 0)

16
include/linux/syscalls.h
View file

@ -190,6 +190,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.event = &event_syscall_enter, \
.raw_init = init_enter_##sname, \
.show_format = syscall_enter_format, \
.define_fields = syscall_enter_define_fields, \
.regfunc = reg_event_syscall_enter, \
.unregfunc = unreg_event_syscall_enter, \
.data = "sys"#sname, \
@ -226,6 +227,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.event = &event_syscall_exit, \
.raw_init = init_exit_##sname, \
.show_format = syscall_exit_format, \
.define_fields = syscall_exit_define_fields, \
.regfunc = reg_event_syscall_exit, \
.unregfunc = unreg_event_syscall_exit, \
.data = "sys"#sname, \
@ -233,6 +235,8 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
}
#define SYSCALL_METADATA(sname, nb) \
SYSCALL_TRACE_ENTER_EVENT(sname); \
SYSCALL_TRACE_EXIT_EVENT(sname); \
static const struct syscall_metadata __used \
__attribute__((__aligned__(4))) \
__attribute__((section("__syscalls_metadata"))) \
@ -241,20 +245,22 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.nb_args = nb, \
.types = types_##sname, \
.args = args_##sname, \
}; \
SYSCALL_TRACE_ENTER_EVENT(sname); \
SYSCALL_TRACE_EXIT_EVENT(sname);
.enter_event = &event_enter_##sname, \
.exit_event = &event_exit_##sname, \
};
#define SYSCALL_DEFINE0(sname) \
SYSCALL_TRACE_ENTER_EVENT(_##sname); \
SYSCALL_TRACE_EXIT_EVENT(_##sname); \
static const struct syscall_metadata __used \
__attribute__((__aligned__(4))) \
__attribute__((section("__syscalls_metadata"))) \
__syscall_meta_##sname = { \
.name = "sys_"#sname, \
.nb_args = 0, \
.enter_event = &event_enter__##sname, \
.exit_event = &event_exit__##sname, \
}; \
SYSCALL_TRACE_ENTER_EVENT(_##sname); \
SYSCALL_TRACE_EXIT_EVENT(_##sname); \
asmlinkage long sys_##sname(void)
#else
#define SYSCALL_DEFINE0(name) asmlinkage long sys_##name(void)

7
include/trace/syscall.h
View file

@ -34,6 +34,8 @@ DECLARE_TRACE_WITH_CALLBACK(syscall_exit,
* @args: list of args as strings (args[i] matches types[i])
* @enter_id: associated ftrace enter event id
* @exit_id: associated ftrace exit event id
* @enter_event: associated syscall_enter trace event
* @exit_event: associated syscall_exit trace event
*/
struct syscall_metadata {
const char *name;
@ -42,6 +44,9 @@ struct syscall_metadata {
const char **args;
int enter_id;
int exit_id;
struct ftrace_event_call *enter_event;
struct ftrace_event_call *exit_event;
};
#ifdef CONFIG_FTRACE_SYSCALLS
@ -59,6 +64,8 @@ extern int syscall_enter_format(struct ftrace_event_call *call,
struct trace_seq *s);
extern int syscall_exit_format(struct ftrace_event_call *call,
struct trace_seq *s);
extern int syscall_enter_define_fields(struct ftrace_event_call *call);
extern int syscall_exit_define_fields(struct ftrace_event_call *call);
enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
#endif

5
kernel/trace/trace_events.c
View file

@ -27,8 +27,8 @@ 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, int is_signed)
int trace_define_field(struct ftrace_event_call *call, const char *type,
const char *name, int offset, int size, int is_signed)
{
struct ftrace_event_field *field;
@ -83,6 +83,7 @@ int trace_define_common_fields(struct ftrace_event_call *call)
return ret;
}
EXPORT_SYMBOL_GPL(trace_define_common_fields);
#ifdef CONFIG_MODULES

51
kernel/trace/trace_syscalls.c
View file

@ -165,6 +165,49 @@ int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
return trace_seq_printf(s, "\nprint fmt: \"0x%%lx\", REC->ret\n");
}
int syscall_enter_define_fields(struct ftrace_event_call *call)
{
struct syscall_trace_enter trace;
struct syscall_metadata *meta;
int ret;
int nr;
int i;
int offset = offsetof(typeof(trace), args);
nr = syscall_name_to_nr(call->data);
meta = syscall_nr_to_meta(nr);
if (!meta)
return 0;
ret = trace_define_common_fields(call);
if (ret)
return ret;
for (i = 0; i < meta->nb_args; i++) {
ret = trace_define_field(call, meta->types[i],
meta->args[i], offset,
sizeof(unsigned long), 0);
offset += sizeof(unsigned long);
}
return ret;
}
int syscall_exit_define_fields(struct ftrace_event_call *call)
{
struct syscall_trace_exit trace;
int ret;
ret = trace_define_common_fields(call);
if (ret)
return ret;
ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0);
return ret;
}
void ftrace_syscall_enter(struct pt_regs *regs, long id)
{
struct syscall_trace_enter *entry;
@ -192,8 +235,8 @@ void ftrace_syscall_enter(struct pt_regs *regs, long id)
entry->nr = syscall_nr;
syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
trace_current_buffer_unlock_commit(event, 0, 0);
trace_wake_up();
if (!filter_current_check_discard(sys_data->enter_event, entry, event))
trace_current_buffer_unlock_commit(event, 0, 0);
}
void ftrace_syscall_exit(struct pt_regs *regs, long ret)
@ -220,8 +263,8 @@ void ftrace_syscall_exit(struct pt_regs *regs, long ret)
entry->nr = syscall_nr;
entry->ret = syscall_get_return_value(current, regs);
trace_current_buffer_unlock_commit(event, 0, 0);
trace_wake_up();
if (!filter_current_check_discard(sys_data->exit_event, entry, event))
trace_current_buffer_unlock_commit(event, 0, 0);
}
int reg_event_syscall_enter(void *ptr)