tracepoint: Add signal loss events (ba005e1f) · Commits · 戴 / test

include/trace/events/signal.h

+68 −0

Original line number	Diff line number	Diff line
		@@ -99,6 +99,74 @@ TRACE_EVENT(signal_deliver,
		__entry->sig, __entry->errno, __entry->code,
		__entry->sa_handler, __entry->sa_flags)
		);

		/**
		* signal_overflow_fail - called when signal queue is overflow
		* @sig: signal number
		* @group: signal to process group or not (bool)
		* @info: pointer to struct siginfo
		*
		* Kernel fails to generate 'sig' signal with 'info' siginfo, because
		* siginfo queue is overflow, and the signal is dropped.
		* 'group' is not 0 if the signal will be sent to a process group.
		* 'sig' is always one of RT signals.
		*/
		TRACE_EVENT(signal_overflow_fail,

		TP_PROTO(int sig, int group, struct siginfo *info),

		TP_ARGS(sig, group, info),

		TP_STRUCT__entry(
		__field( int, sig )
		__field( int, group )
		__field( int, errno )
		__field( int, code )
		),

		TP_fast_assign(
		__entry->sig = sig;
		__entry->group = group;
		TP_STORE_SIGINFO(__entry, info);
		),

		TP_printk("sig=%d group=%d errno=%d code=%d",
		__entry->sig, __entry->group, __entry->errno, __entry->code)
		);

		/**
		* signal_lose_info - called when siginfo is lost
		* @sig: signal number
		* @group: signal to process group or not (bool)
		* @info: pointer to struct siginfo
		*
		* Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
		* queue is overflow.
		* 'group' is not 0 if the signal will be sent to a process group.
		* 'sig' is always one of non-RT signals.
		*/
		TRACE_EVENT(signal_lose_info,

		TP_PROTO(int sig, int group, struct siginfo *info),

		TP_ARGS(sig, group, info),

		TP_STRUCT__entry(
		__field( int, sig )
		__field( int, group )
		__field( int, errno )
		__field( int, code )
		),

		TP_fast_assign(
		__entry->sig = sig;
		__entry->group = group;
		TP_STORE_SIGINFO(__entry, info);
		),

		TP_printk("sig=%d group=%d errno=%d code=%d",
		__entry->sig, __entry->group, __entry->errno, __entry->code)
		);
		#endif /* _TRACE_SIGNAL_H */

		/* This part must be outside protection */

kernel/signal.c

+14 −5

Original line number	Diff line number	Diff line
		@@ -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)
		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().
		* 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:

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