[PATCH -tip 3/3] Add get_signal tracepoint

From: Masami Hiramatsu
Date: Fri Nov 13 2009 - 17:53:24 EST


Add a tracepoint where a process gets a signal. This tracepoint
shows signal-number, sa-handler and sa-flag.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
---

include/trace/events/sched.h | 26 ++++++++++++++++++++++++++
kernel/signal.c | 3 +++
2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index ff9d5fb..de8ca7e 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -354,6 +354,32 @@ TRACE_EVENT(sched_process_coredump,
);

/*
+ * Tracepoint for getting a signal:
+ */
+TRACE_EVENT(sched_process_get_signal,
+
+ TP_PROTO(int sig, struct k_sigaction *ka),
+
+ TP_ARGS(sig, ka),
+
+ TP_STRUCT__entry(
+ __field( int, sig )
+ __field( unsigned long, sa_handler )
+ __field( unsigned long, sa_flags )
+ ),
+
+
+ TP_fast_assign(
+ __entry->sig = sig;
+ __entry->sa_handler = (unsigned long)ka->sa.sa_handler;
+ __entry->sa_flags = ka->sa.sa_flags;
+ ),
+
+ TP_printk("sig: %d sa_handler: %lx sa_flags: %lx",
+ __entry->sig, __entry->sa_handler, __entry->sa_flags)
+);
+
+/*
* Tracepoint for sending a signal:
*/
TRACE_EVENT(sched_signal_send,
diff --git a/kernel/signal.c b/kernel/signal.c
index fe08008..44614fb 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1859,6 +1859,9 @@ relock:
ka = &sighand->action[signr-1];
}

+ /* Trace the actual queued signals including SIG_IGN.*/
+ trace_sched_process_get_signal(signr, ka);
+
if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */
continue;
if (ka->sa.sa_handler != SIG_DFL) {


--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@xxxxxxxxxx
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