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

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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: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4BFA3746.8070100@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Li Zefan
2010-05-24 16:22:30 +08:00
committed by Steven Rostedt
parent f384c954c9
commit c9642c49aa
3 changed files with 4 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/syscalls.h
View File

@@ -165,7 +165,6 @@ extern struct trace_event_functions exit_syscall_print_funcs;
.enter_event = &event_enter_##sname, \ .enter_event = &event_enter_##sname, \
.exit_event = &event_exit_##sname, \ .exit_event = &event_exit_##sname, \
.enter_fields = LIST_HEAD_INIT(__syscall_meta_##sname.enter_fields), \ .enter_fields = LIST_HEAD_INIT(__syscall_meta_##sname.enter_fields), \
.exit_fields = LIST_HEAD_INIT(__syscall_meta_##sname.exit_fields), \
}; };
#define SYSCALL_DEFINE0(sname) \ #define SYSCALL_DEFINE0(sname) \
@@ -180,7 +179,6 @@ extern struct trace_event_functions exit_syscall_print_funcs;
.enter_event = &event_enter__##sname, \ .enter_event = &event_enter__##sname, \
.exit_event = &event_exit__##sname, \ .exit_event = &event_exit__##sname, \
.enter_fields = LIST_HEAD_INIT(__syscall_meta__##sname.enter_fields), \ .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) asmlinkage long sys_##sname(void)
#else #else

1
include/trace/syscall.h
View File

@@ -26,7 +26,6 @@ struct syscall_metadata {
const char **types; const char **types;
const char **args; const char **args;
struct list_head enter_fields; struct list_head enter_fields;
struct list_head exit_fields;
struct ftrace_event_call *enter_event; struct ftrace_event_call *enter_event;
struct ftrace_event_call *exit_event; struct ftrace_event_call *exit_event;

7
kernel/trace/trace_syscalls.c
View File

@@ -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_enter_define_fields(struct ftrace_event_call *call);
static int syscall_exit_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 * static struct list_head *
syscall_get_enter_fields(struct ftrace_event_call *call) 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 * static struct list_head *
syscall_get_exit_fields(struct ftrace_event_call *call) syscall_get_exit_fields(struct ftrace_event_call *call)
{ {
struct syscall_metadata *entry = call->data; return &syscall_exit_fields;
return &entry->exit_fields;
} }
struct trace_event_functions enter_syscall_print_funcs = { struct trace_event_functions enter_syscall_print_funcs = {