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Merge branch 'tracing/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/core

Browse Source 
Conflicts:
	include/linux/tracepoint.h

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2009-08-26 08:29:02 +02:00
parent 7cb2e3ee2a 1c569f0264
commit 35dce1a99d
19 changed files with 154 additions and 93 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/trace/Kconfig
View File

@@ -41,7 +41,7 @@ config HAVE_FTRACE_MCOUNT_RECORD
config HAVE_HW_BRANCH_TRACER
bool
config HAVE_FTRACE_SYSCALLS
config HAVE_SYSCALL_TRACEPOINTS
bool
config TRACER_MAX_TRACE
@@ -211,7 +211,7 @@ config ENABLE_DEFAULT_TRACERS
config FTRACE_SYSCALLS
bool "Trace syscalls"
depends on HAVE_FTRACE_SYSCALLS
depends on HAVE_SYSCALL_TRACEPOINTS
select GENERIC_TRACER
select KALLSYMS
help

17
kernel/trace/trace_syscalls.c
View File

@@ -1,4 +1,5 @@
#include <trace/syscall.h>
#include <trace/events/syscalls.h>
#include <linux/kernel.h>
#include <linux/ftrace.h>
#include <linux/perf_counter.h>
@@ -288,7 +289,7 @@ int reg_event_syscall_enter(void *ptr)
return -ENOSYS;
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_enter)
ret = register_trace_syscall_enter(ftrace_syscall_enter);
ret = register_trace_sys_enter(ftrace_syscall_enter);
if (ret) {
pr_info("event trace: Could not activate"
"syscall entry trace point");
@@ -313,7 +314,7 @@ void unreg_event_syscall_enter(void *ptr)
sys_refcount_enter--;
clear_bit(num, enabled_enter_syscalls);
if (!sys_refcount_enter)
unregister_trace_syscall_enter(ftrace_syscall_enter);
unregister_trace_sys_enter(ftrace_syscall_enter);
mutex_unlock(&syscall_trace_lock);
}
@@ -329,7 +330,7 @@ int reg_event_syscall_exit(void *ptr)
return -ENOSYS;
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_exit)
ret = register_trace_syscall_exit(ftrace_syscall_exit);
ret = register_trace_sys_exit(ftrace_syscall_exit);
if (ret) {
pr_info("event trace: Could not activate"
"syscall exit trace point");
@@ -354,7 +355,7 @@ void unreg_event_syscall_exit(void *ptr)
sys_refcount_exit--;
clear_bit(num, enabled_exit_syscalls);
if (!sys_refcount_exit)
unregister_trace_syscall_exit(ftrace_syscall_exit);
unregister_trace_sys_exit(ftrace_syscall_exit);
mutex_unlock(&syscall_trace_lock);
}
@@ -420,7 +421,7 @@ int reg_prof_syscall_enter(char *name)
mutex_lock(&syscall_trace_lock);
if (!sys_prof_refcount_enter)
ret = register_trace_syscall_enter(prof_syscall_enter);
ret = register_trace_sys_enter(prof_syscall_enter);
if (ret) {
pr_info("event trace: Could not activate"
"syscall entry trace point");
@@ -444,7 +445,7 @@ void unreg_prof_syscall_enter(char *name)
sys_prof_refcount_enter--;
clear_bit(num, enabled_prof_enter_syscalls);
if (!sys_prof_refcount_enter)
unregister_trace_syscall_enter(prof_syscall_enter);
unregister_trace_sys_enter(prof_syscall_enter);
mutex_unlock(&syscall_trace_lock);
}
@@ -481,7 +482,7 @@ int reg_prof_syscall_exit(char *name)
mutex_lock(&syscall_trace_lock);
if (!sys_prof_refcount_exit)
ret = register_trace_syscall_exit(prof_syscall_exit);
ret = register_trace_sys_exit(prof_syscall_exit);
if (ret) {
pr_info("event trace: Could not activate"
"syscall entry trace point");
@@ -505,7 +506,7 @@ void unreg_prof_syscall_exit(char *name)
sys_prof_refcount_exit--;
clear_bit(num, enabled_prof_exit_syscalls);
if (!sys_prof_refcount_exit)
unregister_trace_syscall_exit(prof_syscall_exit);
unregister_trace_sys_exit(prof_syscall_exit);
mutex_unlock(&syscall_trace_lock);
}

20
kernel/tracepoint.c
View File

@@ -243,6 +243,11 @@ static void set_tracepoint(struct tracepoint_entry **entry,
{
WARN_ON(strcmp((*entry)->name, elem->name) != 0);
if (elem->regfunc && !elem->state && active)
elem->regfunc();
else if (elem->unregfunc && elem->state && !active)
elem->unregfunc();
/*
* rcu_assign_pointer has a smp_wmb() which makes sure that the new
* probe callbacks array is consistent before setting a pointer to it.
@@ -262,6 +267,9 @@ static void set_tracepoint(struct tracepoint_entry **entry,
*/
static void disable_tracepoint(struct tracepoint *elem)
{
if (elem->unregfunc && elem->state)
elem->unregfunc();
elem->state = 0;
rcu_assign_pointer(elem->funcs, NULL);
}
@@ -576,9 +584,9 @@ __initcall(init_tracepoints);
#endif /* CONFIG_MODULES */
#ifdef CONFIG_FTRACE_SYSCALLS
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
static DEFINE_MUTEX(regfunc_mutex);
/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
static int sys_tracepoint_refcount;
void syscall_regfunc(void)
@@ -586,16 +594,14 @@ void syscall_regfunc(void)
unsigned long flags;
struct task_struct *g, *t;
mutex_lock(&regfunc_mutex);
if (!sys_tracepoint_refcount) {
read_lock_irqsave(&tasklist_lock, flags);
do_each_thread(g, t) {
set_tsk_thread_flag(t, TIF_SYSCALL_FTRACE);
set_tsk_thread_flag(t, TIF_SYSCALL_TRACEPOINT);
} while_each_thread(g, t);
read_unlock_irqrestore(&tasklist_lock, flags);
}
sys_tracepoint_refcount++;
mutex_unlock(&regfunc_mutex);
}
void syscall_unregfunc(void)
@@ -603,15 +609,13 @@ void syscall_unregfunc(void)
unsigned long flags;
struct task_struct *g, *t;
mutex_lock(&regfunc_mutex);
sys_tracepoint_refcount--;
if (!sys_tracepoint_refcount) {
read_lock_irqsave(&tasklist_lock, flags);
do_each_thread(g, t) {
clear_tsk_thread_flag(t, TIF_SYSCALL_FTRACE);
clear_tsk_thread_flag(t, TIF_SYSCALL_TRACEPOINT);
} while_each_thread(g, t);
read_unlock_irqrestore(&tasklist_lock, flags);
}
mutex_unlock(&regfunc_mutex);
}
#endif