tracing/syscalls: Add filtering support

Add filtering support for syscall events:

 # echo 'mode == 0666' > events/syscalls/sys_enter_open
 # echo 'ret == 0' > events/syscalls/sys_exit_open
 # echo 1 > events/syscalls/sys_enter_open
 # echo 1 > events/syscalls/sys_exit_open
 # cat trace
 ...
   modprobe-3084 [001] 117.463140: sys_open(filename: 917d3e8, flags: 0, mode: 1b6)
   modprobe-3084 [001] 117.463176: sys_open -> 0x0
       less-3086 [001] 117.510455: sys_open(filename: 9c6bdb8, flags: 8000, mode: 1b6)
   sendmail-2574 [001] 122.145840: sys_open(filename: b807a365, flags: 0, mode: 1b6)
 ...

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: <4A8BAFCB.1040006@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 11 insertions, 5 deletions

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 8d57f77794ee..f124c8995555 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -190,6 +190,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
                 .event                  = &event_syscall_enter,         \
                 .raw_init               = init_enter_##sname,           \
                 .show_format            = syscall_enter_format,         \
+                .define_fields          = syscall_enter_define_fields,  \
                 .regfunc                = reg_event_syscall_enter,      \
                 .unregfunc              = unreg_event_syscall_enter,    \
                 .data                   = "sys"#sname,                  \
@@ -226,6 +227,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
                 .event                  = &event_syscall_exit,          \
                 .raw_init               = init_exit_##sname,            \
                 .show_format            = syscall_exit_format,          \
+                .define_fields          = syscall_exit_define_fields,   \
                 .regfunc                = reg_event_syscall_exit,       \
                 .unregfunc              = unreg_event_syscall_exit,     \
                 .data                   = "sys"#sname,                  \
@@ -233,6 +235,8 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
         }
 
 #define SYSCALL_METADATA(sname, nb)                             \
+        SYSCALL_TRACE_ENTER_EVENT(sname);                       \
+        SYSCALL_TRACE_EXIT_EVENT(sname);                        \
         static const struct syscall_metadata __used             \
           __attribute__((__aligned__(4)))                       \
           __attribute__((section("__syscalls_metadata")))       \
@@ -241,20 +245,22 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
                 .nb_args        = nb,                           \
                 .types          = types_##sname,                \
                 .args           = args_##sname,                 \
-        };                                                      \
-        SYSCALL_TRACE_ENTER_EVENT(sname);                       \
-        SYSCALL_TRACE_EXIT_EVENT(sname);
+                .enter_event    = &event_enter_##sname,         \
+                .exit_event     = &event_exit_##sname,          \
+        };
 
 #define SYSCALL_DEFINE0(sname)                                  \
+        SYSCALL_TRACE_ENTER_EVENT(_##sname);                    \
+        SYSCALL_TRACE_EXIT_EVENT(_##sname);                     \
         static const struct syscall_metadata __used             \
           __attribute__((__aligned__(4)))                       \
           __attribute__((section("__syscalls_metadata")))       \
           __syscall_meta_##sname = {                            \
                 .name           = "sys_"#sname,                 \
                 .nb_args        = 0,                            \
+                .enter_event    = &event_enter__##sname,        \
+                .exit_event     = &event_exit__##sname,         \
         };                                                      \
-        SYSCALL_TRACE_ENTER_EVENT(_##sname);                    \
-        SYSCALL_TRACE_EXIT_EVENT(_##sname);                     \
         asmlinkage long sys_##sname(void)
 #else
 #define SYSCALL_DEFINE0(name)      asmlinkage long sys_##name(void)