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[PATCH -tip 3/3] Add get_signal tracepoint
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: Ingo Molnar <mingo at elte dot hu>, lkml<linux-kernel at vger dot kernel dot org>
- Cc: systemtap<systemtap at sources dot redhat dot com>, DLE<dle-develop at lists dot sourceforge dot net>, Masami Hiramatsu <mhiramat at redhat dot com>, Roland McGrath <roland at redhat dot com>
- Date: Fri, 13 Nov 2009 17:52:40 -0500
- Subject: [PATCH -tip 3/3] Add get_signal tracepoint
- References: <20091113225226.15079.90813.stgit@harusame>
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@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
---
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@redhat.com