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tracing/ftrace: Allow for the traceonoff probe be unique to instances

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Have the traceon/off function probe triggers affect only the instance they
are set in. This required making the trace_on/off accessible for other files
in the tracing directory.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-04-20 11:46:03 -04:00
parent cab5037950
commit 2290f2c589
3 changed files with 15 additions and 12 deletions
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4
kernel/trace/trace.c
View File

@ -757,7 +757,7 @@ __trace_buffer_lock_reserve(struct ring_buffer *buffer,
return event;
}
static void tracer_tracing_on(struct trace_array *tr)
void tracer_tracing_on(struct trace_array *tr)
{
if (tr->trace_buffer.buffer)
ring_buffer_record_on(tr->trace_buffer.buffer);
@ -1045,7 +1045,7 @@ void tracing_snapshot_alloc(void)
EXPORT_SYMBOL_GPL(tracing_snapshot_alloc);
#endif /* CONFIG_TRACER_SNAPSHOT */
static void tracer_tracing_off(struct trace_array *tr)
void tracer_tracing_off(struct trace_array *tr)
{
if (tr->trace_buffer.buffer)
ring_buffer_record_off(tr->trace_buffer.buffer);

2
kernel/trace/trace.h
View File

@ -582,6 +582,8 @@ void tracing_reset_all_online_cpus(void);
int tracing_open_generic(struct inode *inode, struct file *filp);
bool tracing_is_disabled(void);
int tracer_tracing_is_on(struct trace_array *tr);
void tracer_tracing_on(struct trace_array *tr);
void tracer_tracing_off(struct trace_array *tr);
struct dentry *trace_create_file(const char *name,
umode_t mode,
struct dentry *parent,

21
kernel/trace/trace_functions.c
View File

@ -268,7 +268,8 @@ static struct tracer function_trace __tracer_data =
#ifdef CONFIG_DYNAMIC_FTRACE
static void update_traceon_count(struct ftrace_probe_ops *ops,
unsigned long ip, bool on,
unsigned long ip,
struct trace_array *tr, bool on,
void *data)
{
struct ftrace_func_mapper *mapper = data;
@ -313,13 +314,13 @@ static void update_traceon_count(struct ftrace_probe_ops *ops,
/* Make sure we see count before checking tracing state */
smp_rmb();
if (on == !!tracing_is_on())
if (on == !!tracer_tracing_is_on(tr))
return;
if (on)
tracing_on();
tracer_tracing_on(tr);
else
tracing_off();
tracer_tracing_off(tr);
/* Make sure tracing state is visible before updating count */
smp_wmb();
@ -332,7 +333,7 @@ ftrace_traceon_count(unsigned long ip, unsigned long parent_ip,
struct trace_array *tr, struct ftrace_probe_ops *ops,
void *data)
{
update_traceon_count(ops, ip, 1, data);
update_traceon_count(ops, ip, tr, 1, data);
}
static void
@ -340,7 +341,7 @@ ftrace_traceoff_count(unsigned long ip, unsigned long parent_ip,
struct trace_array *tr, struct ftrace_probe_ops *ops,
void *data)
{
update_traceon_count(ops, ip, 0, data);
update_traceon_count(ops, ip, tr, 0, data);
}
static void
@ -348,10 +349,10 @@ ftrace_traceon(unsigned long ip, unsigned long parent_ip,
struct trace_array *tr, struct ftrace_probe_ops *ops,
void *data)
{
if (tracing_is_on())
if (tracer_tracing_is_on(tr))
return;
tracing_on();
tracer_tracing_on(tr);
}
static void
@ -359,10 +360,10 @@ ftrace_traceoff(unsigned long ip, unsigned long parent_ip,
struct trace_array *tr, struct ftrace_probe_ops *ops,
void *data)
{
if (!tracing_is_on())
if (!tracer_tracing_is_on(tr))
return;
tracing_off();
tracer_tracing_off(tr);
}
/*