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tracing/syscalls: Add fields format for exit events 

Add "format" file for syscall exit events:

 # cat events/syscalls/sys_exit_open/format
 name: sys_exit_open
 ID: 344
 format:
         field:unsigned short common_type;       offset:0;       size:2;
         field:unsigned char common_flags;       offset:2;       size:1;
         field:unsigned char common_preempt_count;       offset:3;       size:1;
         field:int common_pid;   offset:4;       size:4;
         field:int common_tgid;  offset:8;       size:4;

         field:int nr;   offset:12;      size:4;
         field:unsigned long ret;        offset:16;      size:4;

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A8BAF61.3060307@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan 2009-08-19 15:53:05 +08:00 committed by Ingo Molnar
parent e6971969c3
commit 10a5b66f62
3 changed files with 23 additions and 4 deletions
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3
include/linux/syscalls.h
View File

@ -189,7 +189,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.system = "syscalls", \
.event = &event_syscall_enter, \
.raw_init = init_enter_##sname, \
.show_format = ftrace_format_syscall, \
.show_format = syscall_enter_format, \
.regfunc = reg_event_syscall_enter, \
.unregfunc = unreg_event_syscall_enter, \
.data = "sys"#sname, \
@ -225,6 +225,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.system = "syscalls", \
.event = &event_syscall_exit, \
.raw_init = init_exit_##sname, \
.show_format = syscall_exit_format, \
.regfunc = reg_event_syscall_exit, \
.unregfunc = unreg_event_syscall_exit, \
.data = "sys"#sname, \

6
include/trace/syscall.h
View File

@ -55,8 +55,10 @@ extern int reg_event_syscall_enter(void *ptr);
extern void unreg_event_syscall_enter(void *ptr);
extern int reg_event_syscall_exit(void *ptr);
extern void unreg_event_syscall_exit(void *ptr);
extern int
ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
extern int syscall_enter_format(struct ftrace_event_call *call,
struct trace_seq *s);
extern int syscall_exit_format(struct ftrace_event_call *call,
struct trace_seq *s);
enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
#endif

18
kernel/trace/trace_syscalls.c
View File

@ -97,7 +97,7 @@ extern char *__bad_type_size(void);
__bad_type_size() : \
#type, #name, offsetof(typeof(trace), name), sizeof(trace.name)
int ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s)
int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s)
{
int i;
int nr;
@ -149,6 +149,22 @@ int ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s)
return ret;
}
int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
{
int ret;
struct syscall_trace_exit trace;
ret = trace_seq_printf(s,
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
"\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n",
SYSCALL_FIELD(int, nr),
SYSCALL_FIELD(unsigned long, ret));
if (!ret)
return 0;
return trace_seq_printf(s, "\nprint fmt: \"0x%%lx\", REC->ret\n");
}
void ftrace_syscall_enter(struct pt_regs *regs, long id)
{
struct syscall_trace_enter *entry;