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Commit c9642c49 authored by Li Zefan's avatar Li Zefan Committed by Steven Rostedt
Browse files

tracing: Use a global field list for all syscall exit events 



All syscall exit events have the same fields.

The kernel size drops 2.5K:

   text    data     bss     dec     hex filename
7018612 2034376 7251132 16304120         f8c7f8 vmlinux.o.orig
7018612 2031888 7251132 16301632         f8be40 vmlinux.o

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4BFA3746.8070100@cn.fujitsu.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent f384c954

include/linux/syscalls.h

+0 −2
Original line number Diff line number Diff line
@@ -165,7 +165,6 @@ extern struct trace_event_functions exit_syscall_print_funcs; 
		.enter_event	= &event_enter_##sname,		\

		.exit_event	= &event_exit_##sname,		\

		.enter_fields	= LIST_HEAD_INIT(__syscall_meta_##sname.enter_fields), \

		.exit_fields	= LIST_HEAD_INIT(__syscall_meta_##sname.exit_fields), \

	};



#define SYSCALL_DEFINE0(sname)					\
@@ -180,7 +179,6 @@ extern struct trace_event_functions exit_syscall_print_funcs; 
		.enter_event	= &event_enter__##sname,	\

		.exit_event	= &event_exit__##sname,		\

		.enter_fields	= LIST_HEAD_INIT(__syscall_meta__##sname.enter_fields), \

		.exit_fields	= LIST_HEAD_INIT(__syscall_meta__##sname.exit_fields), \

	};							\

	asmlinkage long sys_##sname(void)

#else

include/trace/syscall.h

+0 −1
Original line number Diff line number Diff line
@@ -26,7 +26,6 @@ struct syscall_metadata { 
	const char	**types;

	const char	**args;

	struct list_head enter_fields;

	struct list_head exit_fields;



	struct ftrace_event_call *enter_event;

	struct ftrace_event_call *exit_event;

kernel/trace/trace_syscalls.c

+4 −3
Original line number Diff line number Diff line
@@ -23,6 +23,9 @@ static int syscall_exit_register(struct ftrace_event_call *event, 
static int syscall_enter_define_fields(struct ftrace_event_call *call);

static int syscall_exit_define_fields(struct ftrace_event_call *call);



/* All syscall exit events have the same fields */

static LIST_HEAD(syscall_exit_fields);



static struct list_head *

syscall_get_enter_fields(struct ftrace_event_call *call)

{
@@ -34,9 +37,7 @@ syscall_get_enter_fields(struct ftrace_event_call *call) 
static struct list_head *

syscall_get_exit_fields(struct ftrace_event_call *call)

{

	struct syscall_metadata *entry = call->data;



	return &entry->exit_fields;

	return &syscall_exit_fields;

}



struct trace_event_functions enter_syscall_print_funcs = {