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authorMasami Hiramatsu <mhiramat@redhat.com>2009-11-24 16:56:58 -0500
committerIngo Molnar <mingo@elte.hu>2009-11-26 10:55:38 +0100
commitba005e1f417295d28cd1563ab82bc33af07fb16a (patch)
treed771659edc46c1bd5467578a6616657c8cf26db5 /kernel/signal.c
parentf9d4257e01d266e67420cc99d456b6d4c8464f54 (diff)
downloadlinux-ba005e1f417295d28cd1563ab82bc33af07fb16a.tar.bz2
tracepoint: Add signal loss events
Add signal_overflow_fail and signal_lose_info tracepoints for signal-lost events. Changes in v3: - Add docbook style comments Changes in v2: - Use siginfo string macro Suggested-by: Roland McGrath <roland@redhat.com> Reviewed-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Masami Hiramatsu <mhiramat@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: <20091124215658.30449.9934.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 349d44937406..93e72e5feae6 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -897,12 +897,21 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
break;
}
} else if (!is_si_special(info)) {
- if (sig >= SIGRTMIN && info->si_code != SI_USER)
- /*
- * Queue overflow, abort. We may abort if the signal was rt
- * and sent by user using something other than kill().
- */
+ if (sig >= SIGRTMIN && info->si_code != SI_USER) {
+ /*
+ * Queue overflow, abort. We may abort if the
+ * signal was rt and sent by user using something
+ * other than kill().
+ */
+ trace_signal_overflow_fail(sig, group, info);
return -EAGAIN;
+ } else {
+ /*
+ * This is a silent loss of information. We still
+ * send the signal, but the *info bits are lost.
+ */
+ trace_signal_lose_info(sig, group, info);
+ }
}
out_set: