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tracing: Add perf counter support for syscalls tracing

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The perf counter support is automated for usual trace events. But we
have to define specific callbacks for this to handle syscalls trace
events

Make 'perf stat -e syscalls:sys_enter_blah' work with syscall style
tracepoints.

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 16:53:02 -04:00
committed by Frederic Weisbecker
parent 64c12e0444
commit f4b5ffccc8
4 changed files with 181 additions and 1 deletions
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52
include/linux/syscalls.h
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@@ -98,6 +98,53 @@ struct perf_counter_attr;
#define __SC_TEST5(t5, a5, ...) __SC_TEST(t5); __SC_TEST4(__VA_ARGS__)
#define __SC_TEST6(t6, a6, ...) __SC_TEST(t6); __SC_TEST5(__VA_ARGS__)
#ifdef CONFIG_EVENT_PROFILE
#define TRACE_SYS_ENTER_PROFILE(sname) \
static int prof_sysenter_enable_##sname(struct ftrace_event_call *event_call) \
{ \
int ret = 0; \
if (!atomic_inc_return(&event_enter_##sname.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)) \
unreg_prof_syscall_enter("sys"#sname); \
}
#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)) \
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)) \
unreg_prof_syscall_exit("sys"#sname); \
}
#define TRACE_SYS_ENTER_PROFILE_INIT(sname) \
.profile_count = ATOMIC_INIT(-1), \
.profile_enable = prof_sysenter_enable_##sname, \
.profile_disable = prof_sysenter_disable_##sname,
#define TRACE_SYS_EXIT_PROFILE_INIT(sname) \
.profile_count = ATOMIC_INIT(-1), \
.profile_enable = prof_sysexit_enable_##sname, \
.profile_disable = prof_sysexit_disable_##sname,
#else
#define TRACE_SYS_ENTER_PROFILE(sname)
#define TRACE_SYS_ENTER_PROFILE_INIT(sname)
#define TRACE_SYS_EXIT_PROFILE(sname)
#define TRACE_SYS_EXIT_PROFILE_INIT(sname)
#endif
#ifdef CONFIG_FTRACE_SYSCALLS
#define __SC_STR_ADECL1(t, a) #a
#define __SC_STR_ADECL2(t, a, ...) #a, __SC_STR_ADECL1(__VA_ARGS__)
@@ -113,7 +160,6 @@ 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; \
struct trace_event enter_syscall_print_##sname = { \
@@ -134,6 +180,7 @@ struct perf_counter_attr;
init_preds(&event_enter_##sname); \
return 0; \
} \
TRACE_SYS_ENTER_PROFILE(sname); \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
@@ -145,6 +192,7 @@ struct perf_counter_attr;
.regfunc = reg_event_syscall_enter, \
.unregfunc = unreg_event_syscall_enter, \
.data = "sys"#sname, \
TRACE_SYS_ENTER_PROFILE_INIT(sname) \
}
#define SYSCALL_TRACE_EXIT_EVENT(sname) \
@@ -167,6 +215,7 @@ struct perf_counter_attr;
init_preds(&event_exit_##sname); \
return 0; \
} \
TRACE_SYS_EXIT_PROFILE(sname); \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
@@ -178,6 +227,7 @@ struct perf_counter_attr;
.regfunc = reg_event_syscall_exit, \
.unregfunc = unreg_event_syscall_exit, \
.data = "sys"#sname, \
TRACE_SYS_EXIT_PROFILE_INIT(sname) \
}
#define SYSCALL_METADATA(sname, nb) \