[PATCH 3/6] tracing/syscalls: Add profile filter support

Li Zefan
2009-09-07T08:14:33Z

This makes syscall profile events filter-able.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
include/linux/syscalls.h | 14 ++++++++++----
kernel/trace/trace_syscalls.c | 9 +++++++--
2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index a8e3782..510d941 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -103,30 +103,36 @@ struct perf_counter_attr;
static int prof_sysenter_enable_##sname(struct ftrace_event_call *event_call) \
{ \
int ret = 0; \
- if (!atomic_inc_return(&event_enter_##sname.profile_count)) \
+ if (!atomic_inc_return(&event_call->profile_count)) \
ret = reg_prof_syscall_enter("sys"#sname); \
return ret; \
} \
\
static void prof_sysenter_disable_##sname(struct ftrace_event_call *event_call)\
{ \
- if (atomic_add_negative(-1, &event_enter_##sname.profile_count)) \
+ if (atomic_add_negative(-1, &event_call->profile_count)) { \
unreg_prof_syscall_enter("sys"#sname); \
+ tracepoint_synchronize_unregister(); \
+ destroy_profile_preds(event_call); \
+ } \
}

#define TRACE_SYS_EXIT_PROFILE(sname) \
static int prof_sysexit_enable_##sname(struct ftrace_event_call *event_call) \
{ \
int ret = 0; \
- if (!atomic_inc_return(&event_exit_##sname.profile_count)) \
+ if (!atomic_inc_return(&event_call->profile_count)) \
ret = reg_prof_syscall_exit("sys"#sname); \
return ret; \
} \
\
static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
{ \
- if (atomic_add_negative(-1, &event_exit_##sname.profile_count)) \
+ if (atomic_add_negative(-1, &event_call->profile_count)) { \
unreg_prof_syscall_exit("sys"#sname); \
+ tracepoint_synchronize_unregister(); \
+ destroy_profile_preds(event_call); \
+ } \
}

#define TRACE_SYS_ENTER_PROFILE_INIT(sname) \
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 8712ce3..c2faf98 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -414,7 +414,10 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
rec->nr = syscall_nr;
syscall_get_arguments(current, regs, 0, sys_data->nb_args,
(unsigned long *)&rec->args);
- perf_tpcounter_event(sys_data->enter_id, 0, 1, rec, size);
+
+ if (profile_filter_check(sys_data->enter_event, &rec))
+ perf_tpcounter_event(sys_data->enter_id, 0, 1,
+ rec, size);
} while(0);
}

@@ -476,7 +479,9 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
rec.nr = syscall_nr;
rec.ret = syscall_get_return_value(current, regs);

- perf_tpcounter_event(sys_data->exit_id, 0, 1, &rec, sizeof(rec));
+ if (profile_filter_check(sys_data->exit_event, &rec))
+ perf_tpcounter_event(sys_data->exit_id, 0, 1,
+ &rec, sizeof(rec));
}

int reg_prof_syscall_exit(char *name)
--
1.6.3