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Subject[PATCH 10/12] add perf counter support
Make 'perf stat -e syscalls:sys_enter_blah' work with syscall style tracepoints.

Signed-off-by: Jason Baron <jbaron@redhat.com>

---
include/linux/perf_counter.h | 2 +
include/linux/syscalls.h | 52 +++++++++++++++++-
include/trace/syscall.h | 7 +++
kernel/trace/trace_syscalls.c | 121 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 181 insertions(+), 1 deletions(-)

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index c484834..aaf0c74 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -734,6 +734,8 @@ extern int sysctl_perf_counter_mlock;
extern int sysctl_perf_counter_sample_rate;

extern void perf_counter_init(void);
+extern void perf_tpcounter_event(int event_id, u64 addr, u64 count,
+ void *record, int entry_size);

#ifndef perf_misc_flags
#define perf_misc_flags(regs) (user_mode(regs) ? PERF_EVENT_MISC_USER : \
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index ce4b01c..5541e75 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -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) \
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index df62840..3ab6dd1 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -58,5 +58,12 @@ extern void unreg_event_syscall_exit(void *ptr);
enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
#endif
+#ifdef CONFIG_EVENT_PROFILE
+int reg_prof_syscall_enter(char *name);
+void unreg_prof_syscall_enter(char *name);
+int reg_prof_syscall_exit(char *name);
+void unreg_prof_syscall_exit(char *name);
+
+#endif

#endif /* _TRACE_SYSCALL_H */
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index e58a9c1..f4eaec3 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -1,6 +1,7 @@
#include <trace/syscall.h>
#include <linux/kernel.h>
#include <linux/ftrace.h>
+#include <linux/perf_counter.h>
#include <asm/syscall.h>

#include "trace_output.h"
@@ -252,3 +253,123 @@ struct trace_event event_syscall_enter = {
struct trace_event event_syscall_exit = {
.trace = print_syscall_exit,
};
+
+#ifdef CONFIG_EVENT_PROFILE
+static DECLARE_BITMAP(enabled_prof_enter_syscalls, FTRACE_SYSCALL_MAX);
+static DECLARE_BITMAP(enabled_prof_exit_syscalls, FTRACE_SYSCALL_MAX);
+static int sys_prof_refcount_enter;
+static int sys_prof_refcount_exit;
+
+static void prof_syscall_enter(struct pt_regs *regs, long id)
+{
+ struct syscall_metadata *sys_data;
+ int syscall_nr;
+
+ syscall_nr = syscall_get_nr(current, regs);
+ if (!test_bit(syscall_nr, enabled_prof_enter_syscalls))
+ return;
+
+ sys_data = syscall_nr_to_meta(syscall_nr);
+ if (!sys_data)
+ return;
+
+ perf_tpcounter_event(sys_data->enter_id, 0, 1, NULL, 0);
+}
+
+int reg_prof_syscall_enter(char *name)
+{
+ int ret = 0;
+ int num;
+
+ num = syscall_name_to_nr(name);
+ if (num < 0 || num >= FTRACE_SYSCALL_MAX)
+ return -ENOSYS;
+
+ mutex_lock(&syscall_trace_lock);
+ if (!sys_prof_refcount_enter)
+ ret = register_trace_syscall_enter(prof_syscall_enter);
+ if (ret) {
+ pr_info("event trace: Could not activate"
+ "syscall entry trace point");
+ } else {
+ set_bit(num, enabled_prof_enter_syscalls);
+ sys_prof_refcount_enter++;
+ }
+ mutex_unlock(&syscall_trace_lock);
+ return ret;
+}
+
+void unreg_prof_syscall_enter(char *name)
+{
+ int num;
+
+ num = syscall_name_to_nr(name);
+ if (num < 0 || num >= FTRACE_SYSCALL_MAX)
+ return;
+
+ mutex_lock(&syscall_trace_lock);
+ sys_prof_refcount_enter--;
+ clear_bit(num, enabled_prof_enter_syscalls);
+ if (!sys_prof_refcount_enter)
+ unregister_trace_syscall_enter(prof_syscall_enter);
+ mutex_unlock(&syscall_trace_lock);
+}
+
+static void prof_syscall_exit(struct pt_regs *regs, long ret)
+{
+ struct syscall_metadata *sys_data;
+ int syscall_nr;
+
+ syscall_nr = syscall_get_nr(current, regs);
+ if (!test_bit(syscall_nr, enabled_prof_exit_syscalls))
+ return;
+
+ sys_data = syscall_nr_to_meta(syscall_nr);
+ if (!sys_data)
+ return;
+
+ perf_tpcounter_event(sys_data->exit_id, 0, 1, NULL, 0);
+}
+
+int reg_prof_syscall_exit(char *name)
+{
+ int ret = 0;
+ int num;
+
+ num = syscall_name_to_nr(name);
+ if (num < 0 || num >= FTRACE_SYSCALL_MAX)
+ return -ENOSYS;
+
+ mutex_lock(&syscall_trace_lock);
+ if (!sys_prof_refcount_exit)
+ ret = register_trace_syscall_exit(prof_syscall_exit);
+ if (ret) {
+ pr_info("event trace: Could not activate"
+ "syscall entry trace point");
+ } else {
+ set_bit(num, enabled_prof_exit_syscalls);
+ sys_prof_refcount_exit++;
+ }
+ mutex_unlock(&syscall_trace_lock);
+ return ret;
+}
+
+void unreg_prof_syscall_exit(char *name)
+{
+ int num;
+
+ num = syscall_name_to_nr(name);
+ if (num < 0 || num >= FTRACE_SYSCALL_MAX)
+ return;
+
+ mutex_lock(&syscall_trace_lock);
+ sys_prof_refcount_exit--;
+ clear_bit(num, enabled_prof_exit_syscalls);
+ if (!sys_prof_refcount_exit)
+ unregister_trace_syscall_exit(prof_syscall_exit);
+ mutex_unlock(&syscall_trace_lock);
+}
+
+#endif
+
+
--
1.6.2.5


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