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tracing/syscalls: Add filtering support

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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>
This commit is contained in:
Li Zefan
2009-08-19 15:54:51 +08:00
committed by Ingo Molnar
parent e647d6b314
commit 540b7b8d65
5 changed files with 71 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
kernel/trace/trace_syscalls.c
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@@ -165,6 +165,49 @@ int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
return trace_seq_printf(s, "\nprint fmt: \"0x%%lx\", REC->ret\n");
}
int syscall_enter_define_fields(struct ftrace_event_call *call)
{
struct syscall_trace_enter trace;
struct syscall_metadata *meta;
int ret;
int nr;
int i;
int offset = offsetof(typeof(trace), args);
nr = syscall_name_to_nr(call->data);
meta = syscall_nr_to_meta(nr);
if (!meta)
return 0;
ret = trace_define_common_fields(call);
if (ret)
return ret;
for (i = 0; i < meta->nb_args; i++) {
ret = trace_define_field(call, meta->types[i],
meta->args[i], offset,
sizeof(unsigned long), 0);
offset += sizeof(unsigned long);
}
return ret;
}
int syscall_exit_define_fields(struct ftrace_event_call *call)
{
struct syscall_trace_exit trace;
int ret;
ret = trace_define_common_fields(call);
if (ret)
return ret;
ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0);
return ret;
}
void ftrace_syscall_enter(struct pt_regs *regs, long id)
{
struct syscall_trace_enter *entry;
@@ -192,8 +235,8 @@ void ftrace_syscall_enter(struct pt_regs *regs, long id)
entry->nr = syscall_nr;
syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);
trace_current_buffer_unlock_commit(event, 0, 0);
trace_wake_up();
if (!filter_current_check_discard(sys_data->enter_event, entry, event))
trace_current_buffer_unlock_commit(event, 0, 0);
}
void ftrace_syscall_exit(struct pt_regs *regs, long ret)
@@ -220,8 +263,8 @@ void ftrace_syscall_exit(struct pt_regs *regs, long ret)
entry->nr = syscall_nr;
entry->ret = syscall_get_return_value(current, regs);
trace_current_buffer_unlock_commit(event, 0, 0);
trace_wake_up();
if (!filter_current_check_discard(sys_data->exit_event, entry, event))
trace_current_buffer_unlock_commit(event, 0, 0);
}
int reg_event_syscall_enter(void *ptr)