tracepoint: Move signal sending tracepoint to events/signal.h

Move signal sending event to events/signal.h. This patch also
renames sched_signal_send event to signal_generate.

Changes in v4:
 - Fix a typo of task_struct pointer.

Changes in v3:
 - Add docbook style comments

Changes in v2:
 - Add siginfo argument
 - Add siginfo storing macro

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <20091124215645.30449.60208.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 74 insertions, 27 deletions

diff --git a/Documentation/DocBook/tracepoint.tmpl b/Documentation/DocBook/tracepoint.tmpl
index b0756d0fd579..8bca1d5cec09 100644
--- a/Documentation/DocBook/tracepoint.tmpl
+++ b/Documentation/DocBook/tracepoint.tmpl
@@ -86,4 +86,9 @@
 !Iinclude/trace/events/irq.h
   </chapter>
 
+  <chapter id="signal">
+   <title>SIGNAL</title>
+!Iinclude/trace/events/signal.h
+  </chapter>
+
 </book>
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 9d316b22388c..cfceb0b73e20 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -288,31 +288,6 @@ TRACE_EVENT(sched_process_fork,
 );
 
 /*
- * Tracepoint for sending a signal:
- */
-TRACE_EVENT(sched_signal_send,
-
-        TP_PROTO(int sig, struct task_struct *p),
-
-        TP_ARGS(sig, p),
-
-        TP_STRUCT__entry(
-                __field(        int,    sig                     )
-                __array(        char,   comm,   TASK_COMM_LEN   )
-                __field(        pid_t,  pid                     )
-        ),
-
-        TP_fast_assign(
-                memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
-                __entry->pid    = p->pid;
-                __entry->sig    = sig;
-        ),
-
-        TP_printk("sig=%d comm=%s pid=%d",
-                  __entry->sig, __entry->comm, __entry->pid)
-);
-
-/*
  * XXX the below sched_stat tracepoints only apply to SCHED_OTHER/BATCH/IDLE
  *     adding sched_stat support to SCHED_FIFO/RR would be welcome.
  */
diff --git a/include/trace/events/signal.h b/include/trace/events/signal.h
new file mode 100644
index 000000000000..ef51756a801d
--- /dev/null
+++ b/include/trace/events/signal.h
@@ -0,0 +1,66 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM signal
+
+#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SIGNAL_H
+
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/tracepoint.h>
+
+#define TP_STORE_SIGINFO(__entry, info)                         \
+        do {                                                    \
+                if (info == SEND_SIG_NOINFO) {                  \
+                        __entry->errno  = 0;                    \
+                        __entry->code   = SI_USER;              \
+                } else if (info == SEND_SIG_PRIV) {             \
+                        __entry->errno  = 0;                    \
+                        __entry->code   = SI_KERNEL;            \
+                } else {                                        \
+                        __entry->errno  = info->si_errno;       \
+                        __entry->code   = info->si_code;        \
+                }                                               \
+        } while (0)
+
+/**
+ * signal_generate - called when a signal is generated
+ * @sig: signal number
+ * @info: pointer to struct siginfo
+ * @task: pointer to struct task_struct
+ *
+ * Current process sends a 'sig' signal to 'task' process with
+ * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
+ * 'info' is not a pointer and you can't access its field. Instead,
+ * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
+ * means that si_code is SI_KERNEL.
+ */
+TRACE_EVENT(signal_generate,
+
+        TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
+
+        TP_ARGS(sig, info, task),
+
+        TP_STRUCT__entry(
+                __field(        int,    sig                     )
+                __field(        int,    errno                   )
+                __field(        int,    code                    )
+                __array(        char,   comm,   TASK_COMM_LEN   )
+                __field(        pid_t,  pid                     )
+        ),
+
+        TP_fast_assign(
+                __entry->sig    = sig;
+                TP_STORE_SIGINFO(__entry, info);
+                memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
+                __entry->pid    = task->pid;
+        ),
+
+        TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
+                  __entry->sig, __entry->errno, __entry->code,
+                  __entry->comm, __entry->pid)
+);
+
+#endif /* _TRACE_SIGNAL_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/kernel/signal.c b/kernel/signal.c
index 6705320784fd..a1e0cc6b32c3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -27,7 +27,8 @@
 #include <linux/freezer.h>
 #include <linux/pid_namespace.h>
 #include <linux/nsproxy.h>
-#include <trace/events/sched.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/signal.h>
 
 #include <asm/param.h>
 #include <asm/uaccess.h>
@@ -834,7 +835,7 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
         struct sigqueue *q;
         int override_rlimit;
 
-        trace_sched_signal_send(sig, t);
+        trace_signal_generate(sig, info, t);
 
         assert_spin_locked(&t->sighand->siglock);