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yaml
---
r: 364908
b: refs/heads/master
c: 12ab74e
h: refs/heads/master
v: v3
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Steven Rostedt authored and Steven Rostedt committed Mar 15, 2013
1 parent 4af4100 commit 9a1bac5
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Showing 3 changed files with 58 additions and 35 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: a7603ff4b5f7e26e67af82a4c3d05eeeb8d7b160
refs/heads/master: 12ab74ee00d154bc05ea2fc659b7ce6519e5d5a6
11 changes: 11 additions & 0 deletions trunk/kernel/trace/trace.h
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,11 @@
#include <linux/trace_seq.h>
#include <linux/ftrace_event.h>

#ifdef CONFIG_FTRACE_SYSCALLS
#include <asm/unistd.h> /* For NR_SYSCALLS */
#include <asm/syscall.h> /* some archs define it here */
#endif

enum trace_type {
__TRACE_FIRST_TYPE = 0,

Expand Down Expand Up @@ -173,6 +178,12 @@ struct trace_array {
int cpu;
int buffer_disabled;
struct trace_cpu trace_cpu; /* place holder */
#ifdef CONFIG_FTRACE_SYSCALLS
int sys_refcount_enter;
int sys_refcount_exit;
DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);
#endif
int stop_count;
int clock_id;
struct tracer *current_trace;
Expand Down
80 changes: 46 additions & 34 deletions trunk/kernel/trace/trace_syscalls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,10 +12,6 @@
#include "trace.h"

static DEFINE_MUTEX(syscall_trace_lock);
static int sys_refcount_enter;
static int sys_refcount_exit;
static DECLARE_BITMAP(enabled_enter_syscalls, NR_syscalls);
static DECLARE_BITMAP(enabled_exit_syscalls, NR_syscalls);

static int syscall_enter_register(struct ftrace_event_call *event,
enum trace_reg type, void *data);
Expand Down Expand Up @@ -303,8 +299,9 @@ static int syscall_exit_define_fields(struct ftrace_event_call *call)
return ret;
}

static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
{
struct trace_array *tr = data;
struct syscall_trace_enter *entry;
struct syscall_metadata *sys_data;
struct ring_buffer_event *event;
Expand All @@ -315,7 +312,7 @@ static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
syscall_nr = trace_get_syscall_nr(current, regs);
if (syscall_nr < 0)
return;
if (!test_bit(syscall_nr, enabled_enter_syscalls))
if (!test_bit(syscall_nr, tr->enabled_enter_syscalls))
return;

sys_data = syscall_nr_to_meta(syscall_nr);
Expand All @@ -324,7 +321,8 @@ static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)

size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;

event = trace_current_buffer_lock_reserve(&buffer,
buffer = tr->buffer;
event = trace_buffer_lock_reserve(buffer,
sys_data->enter_event->event.type, size, 0, 0);
if (!event)
return;
Expand All @@ -338,8 +336,9 @@ static void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
trace_current_buffer_unlock_commit(buffer, event, 0, 0);
}

static void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
{
struct trace_array *tr = data;
struct syscall_trace_exit *entry;
struct syscall_metadata *sys_data;
struct ring_buffer_event *event;
Expand All @@ -349,14 +348,15 @@ static void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
syscall_nr = trace_get_syscall_nr(current, regs);
if (syscall_nr < 0)
return;
if (!test_bit(syscall_nr, enabled_exit_syscalls))
if (!test_bit(syscall_nr, tr->enabled_exit_syscalls))
return;

sys_data = syscall_nr_to_meta(syscall_nr);
if (!sys_data)
return;

event = trace_current_buffer_lock_reserve(&buffer,
buffer = tr->buffer;
event = trace_buffer_lock_reserve(buffer,
sys_data->exit_event->event.type, sizeof(*entry), 0, 0);
if (!event)
return;
Expand All @@ -370,71 +370,79 @@ static void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
trace_current_buffer_unlock_commit(buffer, event, 0, 0);
}

static int reg_event_syscall_enter(struct ftrace_event_call *call)
static int reg_event_syscall_enter(struct ftrace_event_file *file,
struct ftrace_event_call *call)
{
struct trace_array *tr = file->tr;
int ret = 0;
int num;

num = ((struct syscall_metadata *)call->data)->syscall_nr;
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return -ENOSYS;
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_enter)
ret = register_trace_sys_enter(ftrace_syscall_enter, NULL);
if (!tr->sys_refcount_enter)
ret = register_trace_sys_enter(ftrace_syscall_enter, tr);
if (!ret) {
set_bit(num, enabled_enter_syscalls);
sys_refcount_enter++;
set_bit(num, tr->enabled_enter_syscalls);
tr->sys_refcount_enter++;
}
mutex_unlock(&syscall_trace_lock);
return ret;
}

static void unreg_event_syscall_enter(struct ftrace_event_call *call)
static void unreg_event_syscall_enter(struct ftrace_event_file *file,
struct ftrace_event_call *call)
{
struct trace_array *tr = file->tr;
int num;

num = ((struct syscall_metadata *)call->data)->syscall_nr;
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return;
mutex_lock(&syscall_trace_lock);
sys_refcount_enter--;
clear_bit(num, enabled_enter_syscalls);
if (!sys_refcount_enter)
unregister_trace_sys_enter(ftrace_syscall_enter, NULL);
tr->sys_refcount_enter--;
clear_bit(num, tr->enabled_enter_syscalls);
if (!tr->sys_refcount_enter)
unregister_trace_sys_enter(ftrace_syscall_enter, tr);
mutex_unlock(&syscall_trace_lock);
}

static int reg_event_syscall_exit(struct ftrace_event_call *call)
static int reg_event_syscall_exit(struct ftrace_event_file *file,
struct ftrace_event_call *call)
{
struct trace_array *tr = file->tr;
int ret = 0;
int num;

num = ((struct syscall_metadata *)call->data)->syscall_nr;
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return -ENOSYS;
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_exit)
ret = register_trace_sys_exit(ftrace_syscall_exit, NULL);
if (!tr->sys_refcount_exit)
ret = register_trace_sys_exit(ftrace_syscall_exit, tr);
if (!ret) {
set_bit(num, enabled_exit_syscalls);
sys_refcount_exit++;
set_bit(num, tr->enabled_exit_syscalls);
tr->sys_refcount_exit++;
}
mutex_unlock(&syscall_trace_lock);
return ret;
}

static void unreg_event_syscall_exit(struct ftrace_event_call *call)
static void unreg_event_syscall_exit(struct ftrace_event_file *file,
struct ftrace_event_call *call)
{
struct trace_array *tr = file->tr;
int num;

num = ((struct syscall_metadata *)call->data)->syscall_nr;
if (WARN_ON_ONCE(num < 0 || num >= NR_syscalls))
return;
mutex_lock(&syscall_trace_lock);
sys_refcount_exit--;
clear_bit(num, enabled_exit_syscalls);
if (!sys_refcount_exit)
unregister_trace_sys_exit(ftrace_syscall_exit, NULL);
tr->sys_refcount_exit--;
clear_bit(num, tr->enabled_exit_syscalls);
if (!tr->sys_refcount_exit)
unregister_trace_sys_exit(ftrace_syscall_exit, tr);
mutex_unlock(&syscall_trace_lock);
}

Expand Down Expand Up @@ -685,11 +693,13 @@ static void perf_sysexit_disable(struct ftrace_event_call *call)
static int syscall_enter_register(struct ftrace_event_call *event,
enum trace_reg type, void *data)
{
struct ftrace_event_file *file = data;

switch (type) {
case TRACE_REG_REGISTER:
return reg_event_syscall_enter(event);
return reg_event_syscall_enter(file, event);
case TRACE_REG_UNREGISTER:
unreg_event_syscall_enter(event);
unreg_event_syscall_enter(file, event);
return 0;

#ifdef CONFIG_PERF_EVENTS
Expand All @@ -711,11 +721,13 @@ static int syscall_enter_register(struct ftrace_event_call *event,
static int syscall_exit_register(struct ftrace_event_call *event,
enum trace_reg type, void *data)
{
struct ftrace_event_file *file = data;

switch (type) {
case TRACE_REG_REGISTER:
return reg_event_syscall_exit(event);
return reg_event_syscall_exit(file, event);
case TRACE_REG_UNREGISTER:
unreg_event_syscall_exit(event);
unreg_event_syscall_exit(file, event);
return 0;

#ifdef CONFIG_PERF_EVENTS
Expand Down

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