unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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tracing: Add ftrace event call parameter to its field descriptor handler

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Add the struct ftrace_event_call as a parameter of its show_format()
callback. This way we can use it from the syscall trace events to
retrieve the syscall name from the ftrace event call parameter and
describe its fields using the syscalls metadata.

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:
Frederic Weisbecker 2009-08-11 17:42:52 +02:00
parent 0ac676fb50
commit e8f9f4d79a
4 changed files with 9 additions and 5 deletions
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3
include/linux/ftrace_event.h
View file

@ -116,7 +116,8 @@ struct ftrace_event_call {
void (*unregfunc)(void *);
int id;
int (*raw_init)(void);
int (*show_format)(struct trace_seq *s);
int (*show_format)(struct ftrace_event_call *call,
struct trace_seq *s);
int (*define_fields)(void);
struct list_head fields;
int filter_active;

3
include/trace/ftrace.h
View file

@ -151,7 +151,8 @@
#undef TRACE_EVENT
#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
static int \
ftrace_format_##call(struct trace_seq *s) \
ftrace_format_##call(struct ftrace_event_call *unused, \
struct trace_seq *s) \
{ \
struct ftrace_raw_##call field __attribute__((unused)); \
int ret = 0; \

2
kernel/trace/trace_events.c
View file

@ -576,7 +576,7 @@ event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
trace_seq_printf(s, "format:\n");
trace_write_header(s);
r = call->show_format(s);
r = call->show_format(call, s);
if (!r) {
/*
* ug! The format output is bigger than a PAGE!!

6
kernel/trace/trace_export.c
View file

@ -60,7 +60,8 @@ extern void __bad_type_size(void);
#undef TRACE_EVENT_FORMAT
#define TRACE_EVENT_FORMAT(call, proto, args, fmt, tstruct, tpfmt) \
static int \
ftrace_format_##call(struct trace_seq *s) \
ftrace_format_##call(struct ftrace_event_call *unused, \
struct trace_seq *s) \
{ \
struct args field; \
int ret; \
@ -76,7 +77,8 @@ ftrace_format_##call(struct trace_seq *s) \
#define TRACE_EVENT_FORMAT_NOFILTER(call, proto, args, fmt, tstruct, \
tpfmt) \
static int \
ftrace_format_##call(struct trace_seq *s) \
ftrace_format_##call(struct ftrace_event_call *unused, \
struct trace_seq *s) \
{ \
struct args field; \
int ret; \