tracing: Add individual syscalls tracepoint id support
The current state of syscalls tracepoints generates only one event id
for every syscall events.
This patch associates an id with each syscall trace event, so that we
can identify each syscall trace event using the 'perf' tool.
Signed-off-by: Jason Baron <jbaron@redhat.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>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index c7ae25e..e58a9c1 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -36,14 +36,18 @@
struct syscall_metadata *entry;
int i, ret, syscall;
- trace_assign_type(trace, ent);
-
+ trace = (typeof(trace))ent;
syscall = trace->nr;
-
entry = syscall_nr_to_meta(syscall);
+
if (!entry)
goto end;
+ if (entry->enter_id != ent->type) {
+ WARN_ON_ONCE(1);
+ goto end;
+ }
+
ret = trace_seq_printf(s, "%s(", entry->name);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
@@ -78,16 +82,20 @@
struct syscall_metadata *entry;
int ret;
- trace_assign_type(trace, ent);
-
+ trace = (typeof(trace))ent;
syscall = trace->nr;
-
entry = syscall_nr_to_meta(syscall);
+
if (!entry) {
trace_seq_printf(s, "\n");
return TRACE_TYPE_HANDLED;
}
+ if (entry->exit_id != ent->type) {
+ WARN_ON_ONCE(1);
+ return TRACE_TYPE_UNHANDLED;
+ }
+
ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
trace->ret);
if (!ret)
@@ -114,7 +122,7 @@
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
- event = trace_current_buffer_lock_reserve(TRACE_SYSCALL_ENTER, size,
+ event = trace_current_buffer_lock_reserve(sys_data->enter_id, size,
0, 0);
if (!event)
return;
@@ -142,7 +150,7 @@
if (!sys_data)
return;
- event = trace_current_buffer_lock_reserve(TRACE_SYSCALL_EXIT,
+ event = trace_current_buffer_lock_reserve(sys_data->exit_id,
sizeof(*entry), 0, 0);
if (!event)
return;
@@ -239,10 +247,8 @@
struct trace_event event_syscall_enter = {
.trace = print_syscall_enter,
- .type = TRACE_SYSCALL_ENTER
};
struct trace_event event_syscall_exit = {
.trace = print_syscall_exit,
- .type = TRACE_SYSCALL_EXIT
};