tracing: Add fields format definition for syscall events
Define the format of the syscall trace fields to parse the binary values from a raw trace using the syscall events "format" file. This is defined dynamically using the syscalls metadata. It prepares the export of syscall event raw records to perf counters. Example: $ cat /debug/tracing/events/syscalls/sys_enter_sched_getparam/format name: sys_enter_sched_getparam ID: 39 format: field:unsigned short common_type; offset:0; size:2; field:unsigned char common_flags; offset:2; size:1; field:unsigned char common_preempt_count; offset:3; size:1; field:int common_pid; offset:4; size:4; field:int common_tgid; offset:8; size:4; field:pid_t pid; offset:12; size:8; field:struct sched_param * param; offset:20; size:8; print fmt: "pid: 0x%08lx, param: 0x%08lx", ((unsigned long)(REC->pid)), ((unsigned long)(REC->param)) Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Jiaying Zhang <jiayingz@google.com> Cc: Martin Bligh <mbligh@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Jason Baron <jbaron@redhat.com>
This commit is contained in:
parent
e8f9f4d79a
commit
dc4ddb4c0b
|
@ -189,6 +189,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
|
||||||
.system = "syscalls", \
|
.system = "syscalls", \
|
||||||
.event = &event_syscall_enter, \
|
.event = &event_syscall_enter, \
|
||||||
.raw_init = init_enter_##sname, \
|
.raw_init = init_enter_##sname, \
|
||||||
|
.show_format = ftrace_format_syscall, \
|
||||||
.regfunc = reg_event_syscall_enter, \
|
.regfunc = reg_event_syscall_enter, \
|
||||||
.unregfunc = unreg_event_syscall_enter, \
|
.unregfunc = unreg_event_syscall_enter, \
|
||||||
.data = "sys"#sname, \
|
.data = "sys"#sname, \
|
||||||
|
|
|
@ -55,6 +55,8 @@ extern int reg_event_syscall_enter(void *ptr);
|
||||||
extern void unreg_event_syscall_enter(void *ptr);
|
extern void unreg_event_syscall_enter(void *ptr);
|
||||||
extern int reg_event_syscall_exit(void *ptr);
|
extern int reg_event_syscall_exit(void *ptr);
|
||||||
extern void unreg_event_syscall_exit(void *ptr);
|
extern void unreg_event_syscall_exit(void *ptr);
|
||||||
|
extern int
|
||||||
|
ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
|
||||||
enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
|
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);
|
enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
|
||||||
#endif
|
#endif
|
||||||
|
|
|
@ -105,6 +105,52 @@ print_syscall_exit(struct trace_iterator *iter, int flags)
|
||||||
return TRACE_TYPE_HANDLED;
|
return TRACE_TYPE_HANDLED;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
int ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s)
|
||||||
|
{
|
||||||
|
int i;
|
||||||
|
int nr;
|
||||||
|
int ret = 0;
|
||||||
|
struct syscall_metadata *entry;
|
||||||
|
int offset = sizeof(struct trace_entry);
|
||||||
|
|
||||||
|
nr = syscall_name_to_nr((char *)call->data);
|
||||||
|
entry = syscall_nr_to_meta(nr);
|
||||||
|
|
||||||
|
if (!entry)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
for (i = 0; i < entry->nb_args; i++) {
|
||||||
|
ret = trace_seq_printf(s, "\tfield:%s %s;", entry->types[i],
|
||||||
|
entry->args[i]);
|
||||||
|
if (!ret)
|
||||||
|
return 0;
|
||||||
|
ret = trace_seq_printf(s, "\toffset:%d;\tsize:%lu;\n", offset,
|
||||||
|
sizeof(unsigned long));
|
||||||
|
if (!ret)
|
||||||
|
return 0;
|
||||||
|
offset += sizeof(unsigned long);
|
||||||
|
}
|
||||||
|
|
||||||
|
trace_seq_printf(s, "\nprint fmt: \"");
|
||||||
|
for (i = 0; i < entry->nb_args; i++) {
|
||||||
|
ret = trace_seq_printf(s, "%s: 0x%%0%lulx%s", entry->args[i],
|
||||||
|
sizeof(unsigned long),
|
||||||
|
i == entry->nb_args - 1 ? "\", " : ", ");
|
||||||
|
if (!ret)
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
for (i = 0; i < entry->nb_args; i++) {
|
||||||
|
ret = trace_seq_printf(s, "((unsigned long)(REC->%s))%s",
|
||||||
|
entry->args[i],
|
||||||
|
i == entry->nb_args - 1 ? "\n" : ", ");
|
||||||
|
if (!ret)
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
void ftrace_syscall_enter(struct pt_regs *regs, long id)
|
void ftrace_syscall_enter(struct pt_regs *regs, long id)
|
||||||
{
|
{
|
||||||
struct syscall_trace_enter *entry;
|
struct syscall_trace_enter *entry;
|
||||||
|
|
Loading…
Reference in a new issue