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tracing: Add trace events for each syscall entry/exit

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Layer Frederic's syscall tracer on tracepoints. We create trace events
via hooking into the SYSCALL_DEFINE macros. This allows us to
individually toggle syscall entry and exit points on/off.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Jason Baron
2009-08-10 16:52:47 -04:00
committed by Frederic Weisbecker
parent 69fd4f0eb2
commit fb34a08c34
3 changed files with 166 additions and 110 deletions
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61
include/linux/syscalls.h
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@@ -64,6 +64,7 @@ struct perf_counter_attr;
#include <linux/sem.h>
#include <asm/siginfo.h>
#include <asm/signal.h>
#include <linux/unistd.h>
#include <linux/quota.h>
#include <linux/key.h>
#include <trace/syscall.h>
@@ -112,6 +113,59 @@ struct perf_counter_attr;
#define __SC_STR_TDECL5(t, a, ...) #t, __SC_STR_TDECL4(__VA_ARGS__)
#define __SC_STR_TDECL6(t, a, ...) #t, __SC_STR_TDECL5(__VA_ARGS__)
#define SYSCALL_TRACE_ENTER_EVENT(sname) \
static struct ftrace_event_call event_enter_##sname; \
static int init_enter_##sname(void) \
{ \
int num; \
num = syscall_name_to_nr("sys"#sname); \
if (num < 0) \
return -ENOSYS; \
register_ftrace_event(&event_syscall_enter); \
INIT_LIST_HEAD(&event_enter_##sname.fields); \
init_preds(&event_enter_##sname); \
return 0; \
} \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
event_enter_##sname = { \
.name = "sys_enter"#sname, \
.system = "syscalls", \
.event = &event_syscall_enter, \
.raw_init = init_enter_##sname, \
.regfunc = reg_event_syscall_enter, \
.unregfunc = unreg_event_syscall_enter, \
.data = "sys"#sname, \
}
#define SYSCALL_TRACE_EXIT_EVENT(sname) \
static struct ftrace_event_call event_exit_##sname; \
static int init_exit_##sname(void) \
{ \
int num; \
num = syscall_name_to_nr("sys"#sname); \
if (num < 0) \
return -ENOSYS; \
register_ftrace_event(&event_syscall_exit); \
INIT_LIST_HEAD(&event_exit_##sname.fields); \
init_preds(&event_exit_##sname); \
return 0; \
} \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
event_exit_##sname = { \
.name = "sys_exit"#sname, \
.system = "syscalls", \
.event = &event_syscall_exit, \
.raw_init = init_exit_##sname, \
.regfunc = reg_event_syscall_exit, \
.unregfunc = unreg_event_syscall_exit, \
.data = "sys"#sname, \
}
#define SYSCALL_METADATA(sname, nb) \
static const struct syscall_metadata __used \
__attribute__((__aligned__(4))) \
@@ -121,7 +175,9 @@ struct perf_counter_attr;
.nb_args = nb, \
.types = types_##sname, \
.args = args_##sname, \
}
}; \
SYSCALL_TRACE_ENTER_EVENT(sname); \
SYSCALL_TRACE_EXIT_EVENT(sname);
#define SYSCALL_DEFINE0(sname) \
static const struct syscall_metadata __used \
@@ -131,8 +187,9 @@ struct perf_counter_attr;
.name = "sys_"#sname, \
.nb_args = 0, \
}; \
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)
#endif