From ba005e1f417295d28cd1563ab82bc33af07fb16a Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Tue, 24 Nov 2009 16:56:58 -0500 Subject: 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 Reviewed-by: Jason Baron Signed-off-by: Masami Hiramatsu Acked-by: Roland McGrath Cc: systemtap Cc: DLE Cc: Oleg Nesterov LKML-Reference: <20091124215658.30449.9934.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar --- kernel/signal.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) (limited to 'kernel/signal.c') 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: -- cgit v1.2.3