Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip into trace/tip/tracing/core-7
Conflicts: include/linux/ftrace_event.h include/trace/ftrace.h kernel/trace/trace_event_perf.c kernel/trace/trace_kprobe.c kernel/trace/trace_syscalls.c Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt
Steven Rostedt
@@ -9,13 +9,9 @@
|
||||
#include <linux/kprobes.h>
|
||||
#include "trace.h"
|
||||
|
||||
DEFINE_PER_CPU(struct pt_regs, perf_trace_regs);
|
||||
EXPORT_PER_CPU_SYMBOL_GPL(perf_trace_regs);
|
||||
|
||||
EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
|
||||
|
||||
static char *perf_trace_buf;
|
||||
static char *perf_trace_buf_nmi;
|
||||
static char *perf_trace_buf[4];
|
||||
|
||||
/*
|
||||
* Force it to be aligned to unsigned long to avoid misaligned accesses
|
||||
@@ -27,63 +23,82 @@ typedef typeof(unsigned long [PERF_MAX_TRACE_SIZE / sizeof(unsigned long)])
|
||||
/* Count the events in use (per event id, not per instance) */
|
||||
static int total_ref_count;
|
||||
|
||||
static int perf_trace_event_enable(struct ftrace_event_call *event)
|
||||
static int perf_trace_event_init(struct ftrace_event_call *tp_event,
|
||||
struct perf_event *p_event)
|
||||
{
|
||||
char *buf;
|
||||
struct hlist_head *list;
|
||||
int ret = -ENOMEM;
|
||||
int cpu;
|
||||
|
||||
if (event->perf_refcount++ > 0)
|
||||
p_event->tp_event = tp_event;
|
||||
if (tp_event->perf_refcount++ > 0)
|
||||
return 0;
|
||||
|
||||
list = alloc_percpu(struct hlist_head);
|
||||
if (!list)
|
||||
goto fail;
|
||||
|
||||
for_each_possible_cpu(cpu)
|
||||
INIT_HLIST_HEAD(per_cpu_ptr(list, cpu));
|
||||
|
||||
tp_event->perf_events = list;
|
||||
|
||||
if (!total_ref_count) {
|
||||
buf = (char *)alloc_percpu(perf_trace_t);
|
||||
if (!buf)
|
||||
goto fail_buf;
|
||||
char *buf;
|
||||
int i;
|
||||
|
||||
rcu_assign_pointer(perf_trace_buf, buf);
|
||||
for (i = 0; i < 4; i++) {
|
||||
buf = (char *)alloc_percpu(perf_trace_t);
|
||||
if (!buf)
|
||||
goto fail;
|
||||
|
||||
buf = (char *)alloc_percpu(perf_trace_t);
|
||||
if (!buf)
|
||||
goto fail_buf_nmi;
|
||||
|
||||
rcu_assign_pointer(perf_trace_buf_nmi, buf);
|
||||
perf_trace_buf[i] = buf;
|
||||
}
|
||||
}
|
||||
|
||||
if (event->class->reg)
|
||||
ret = event->class->reg(event, TRACE_REG_PERF_REGISTER);
|
||||
if (tp_event->class->reg)
|
||||
ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
|
||||
else
|
||||
ret = tracepoint_probe_register(event->name,
|
||||
event->class->perf_probe,
|
||||
event);
|
||||
if (!ret) {
|
||||
total_ref_count++;
|
||||
return 0;
|
||||
ret = tracepoint_probe_register(tp_event->name,
|
||||
tp_event->class->perf_probe,
|
||||
tp_event);
|
||||
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
total_ref_count++;
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
if (!total_ref_count) {
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
free_percpu(perf_trace_buf[i]);
|
||||
perf_trace_buf[i] = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
fail_buf_nmi:
|
||||
if (!total_ref_count) {
|
||||
free_percpu(perf_trace_buf_nmi);
|
||||
free_percpu(perf_trace_buf);
|
||||
perf_trace_buf_nmi = NULL;
|
||||
perf_trace_buf = NULL;
|
||||
if (!--tp_event->perf_refcount) {
|
||||
free_percpu(tp_event->perf_events);
|
||||
tp_event->perf_events = NULL;
|
||||
}
|
||||
fail_buf:
|
||||
event->perf_refcount--;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int perf_trace_enable(int event_id)
|
||||
int perf_trace_init(struct perf_event *p_event)
|
||||
{
|
||||
struct ftrace_event_call *event;
|
||||
struct ftrace_event_call *tp_event;
|
||||
int event_id = p_event->attr.config;
|
||||
int ret = -EINVAL;
|
||||
|
||||
mutex_lock(&event_mutex);
|
||||
list_for_each_entry(event, &ftrace_events, list) {
|
||||
if (event->event.type == event_id &&
|
||||
event->class && event->class->perf_probe &&
|
||||
try_module_get(event->mod)) {
|
||||
ret = perf_trace_event_enable(event);
|
||||
list_for_each_entry(tp_event, &ftrace_events, list) {
|
||||
if (tp_event->event.type == event_id &&
|
||||
tp_event->class && tp_event->class->perf_probe &&
|
||||
try_module_get(tp_event->mod)) {
|
||||
ret = perf_trace_event_init(tp_event, p_event);
|
||||
break;
|
||||
}
|
||||
}
|
||||
@@ -92,93 +107,76 @@ int perf_trace_enable(int event_id)
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void perf_trace_event_disable(struct ftrace_event_call *event)
|
||||
int perf_trace_enable(struct perf_event *p_event)
|
||||
{
|
||||
char *buf, *nmi_buf;
|
||||
struct ftrace_event_call *tp_event = p_event->tp_event;
|
||||
struct hlist_head *list;
|
||||
|
||||
if (--event->perf_refcount > 0)
|
||||
return;
|
||||
list = tp_event->perf_events;
|
||||
if (WARN_ON_ONCE(!list))
|
||||
return -EINVAL;
|
||||
|
||||
if (event->class->reg)
|
||||
event->class->reg(event, TRACE_REG_PERF_UNREGISTER);
|
||||
else
|
||||
tracepoint_probe_unregister(event->name, event->class->perf_probe, event);
|
||||
list = per_cpu_ptr(list, smp_processor_id());
|
||||
hlist_add_head_rcu(&p_event->hlist_entry, list);
|
||||
|
||||
if (!--total_ref_count) {
|
||||
buf = perf_trace_buf;
|
||||
rcu_assign_pointer(perf_trace_buf, NULL);
|
||||
|
||||
nmi_buf = perf_trace_buf_nmi;
|
||||
rcu_assign_pointer(perf_trace_buf_nmi, NULL);
|
||||
|
||||
/*
|
||||
* Ensure every events in profiling have finished before
|
||||
* releasing the buffers
|
||||
*/
|
||||
synchronize_sched();
|
||||
|
||||
free_percpu(buf);
|
||||
free_percpu(nmi_buf);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void perf_trace_disable(int event_id)
|
||||
void perf_trace_disable(struct perf_event *p_event)
|
||||
{
|
||||
struct ftrace_event_call *event;
|
||||
hlist_del_rcu(&p_event->hlist_entry);
|
||||
}
|
||||
|
||||
mutex_lock(&event_mutex);
|
||||
list_for_each_entry(event, &ftrace_events, list) {
|
||||
if (event->event.type == event_id) {
|
||||
perf_trace_event_disable(event);
|
||||
module_put(event->mod);
|
||||
break;
|
||||
void perf_trace_destroy(struct perf_event *p_event)
|
||||
{
|
||||
struct ftrace_event_call *tp_event = p_event->tp_event;
|
||||
int i;
|
||||
|
||||
if (--tp_event->perf_refcount > 0)
|
||||
return;
|
||||
|
||||
if (tp_event->class->reg)
|
||||
tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
|
||||
else
|
||||
tracepoint_probe_unregister(tp_event->name,
|
||||
tp_event->class->perf_probe,
|
||||
tp_event);
|
||||
|
||||
free_percpu(tp_event->perf_events);
|
||||
tp_event->perf_events = NULL;
|
||||
|
||||
if (!--total_ref_count) {
|
||||
for (i = 0; i < 4; i++) {
|
||||
free_percpu(perf_trace_buf[i]);
|
||||
perf_trace_buf[i] = NULL;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&event_mutex);
|
||||
}
|
||||
|
||||
__kprobes void *perf_trace_buf_prepare(int size, unsigned short type,
|
||||
int *rctxp, unsigned long *irq_flags)
|
||||
struct pt_regs *regs, int *rctxp)
|
||||
{
|
||||
struct trace_entry *entry;
|
||||
char *trace_buf, *raw_data;
|
||||
int pc, cpu;
|
||||
char *raw_data;
|
||||
int pc;
|
||||
|
||||
BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
|
||||
|
||||
pc = preempt_count();
|
||||
|
||||
/* Protect the per cpu buffer, begin the rcu read side */
|
||||
local_irq_save(*irq_flags);
|
||||
|
||||
*rctxp = perf_swevent_get_recursion_context();
|
||||
if (*rctxp < 0)
|
||||
goto err_recursion;
|
||||
return NULL;
|
||||
|
||||
cpu = smp_processor_id();
|
||||
|
||||
if (in_nmi())
|
||||
trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
|
||||
else
|
||||
trace_buf = rcu_dereference_sched(perf_trace_buf);
|
||||
|
||||
if (!trace_buf)
|
||||
goto err;
|
||||
|
||||
raw_data = per_cpu_ptr(trace_buf, cpu);
|
||||
raw_data = per_cpu_ptr(perf_trace_buf[*rctxp], smp_processor_id());
|
||||
|
||||
/* zero the dead bytes from align to not leak stack to user */
|
||||
memset(&raw_data[size - sizeof(u64)], 0, sizeof(u64));
|
||||
|
||||
entry = (struct trace_entry *)raw_data;
|
||||
tracing_generic_entry_update(entry, *irq_flags, pc);
|
||||
tracing_generic_entry_update(entry, regs->flags, pc);
|
||||
entry->type = type;
|
||||
|
||||
return raw_data;
|
||||
err:
|
||||
perf_swevent_put_recursion_context(*rctxp);
|
||||
err_recursion:
|
||||
local_irq_restore(*irq_flags);
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(perf_trace_buf_prepare);
|
||||
|
||||
Reference in New Issue
Block a user