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Commit 53cf810b authored by Frederic Weisbecker's avatar Frederic Weisbecker
Browse files

tracing: Allow syscall trace events for non privileged users 



As for the raw syscalls events, individual syscall events won't
leak system wide information on task bound tracing. Allow non
privileged users to use them in such workflow.

Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jason Baron <jbaron@redhat.com>
parent fe554203

include/linux/ftrace_event.h

+8 −0
Original line number Diff line number Diff line
@@ -198,6 +198,14 @@ struct ftrace_event_call { 
#endif

};



#define __TRACE_EVENT_FLAGS(name, value)				\

	static int __init trace_init_flags_##name(void)			\

	{								\

		event_##name.flags = value;				\

		return 0;						\

	}								\

	early_initcall(trace_init_flags_##name);



#define PERF_MAX_TRACE_SIZE	2048



#define MAX_FILTER_PRED		32

include/linux/syscalls.h

+4 −2
Original line number Diff line number Diff line
@@ -137,7 +137,8 @@ extern struct trace_event_functions exit_syscall_print_funcs; 
		.class			= &event_class_syscall_enter,	\

		.event.funcs            = &enter_syscall_print_funcs,	\

		.data			= (void *)&__syscall_meta_##sname,\

	}

	};								\

	__TRACE_EVENT_FLAGS(enter_##sname, TRACE_EVENT_FL_CAP_ANY)



#define SYSCALL_TRACE_EXIT_EVENT(sname)					\

	static struct syscall_metadata					\
@@ -152,7 +153,8 @@ extern struct trace_event_functions exit_syscall_print_funcs; 
		.class			= &event_class_syscall_exit,	\

		.event.funcs		= &exit_syscall_print_funcs,	\

		.data			= (void *)&__syscall_meta_##sname,\

	}

	};								\

	__TRACE_EVENT_FLAGS(exit_##sname, TRACE_EVENT_FL_CAP_ANY)



#define SYSCALL_METADATA(sname, nb)				\

	SYSCALL_TRACE_ENTER_EVENT(sname);			\

include/trace/ftrace.h

+1 −6
Original line number Diff line number Diff line
@@ -84,12 +84,7 @@ 


#undef TRACE_EVENT_FLAGS

#define TRACE_EVENT_FLAGS(name, value)					\

	static int __init trace_init_flags_##name(void)			\

	{								\

		event_##name.flags = value;				\

		return 0;						\

	}								\

	early_initcall(trace_init_flags_##name);

	__TRACE_EVENT_FLAGS(name, value)



#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)