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Merge branch 'tip/perf/core-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/core 

Pull ftrace fixlets from Steve Rostedt.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2012-08-21 11:36:39 +02:00
parent bcada3d4b8 87abb3b15c
commit a0e0fac633
4 changed files with 19 additions and 20 deletions
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4
kernel/trace/ring_buffer.c
View File

@ -2816,7 +2816,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_enable);
* to the buffer after this will fail and return NULL.
*
* This is different than ring_buffer_record_disable() as
* it works like an on/off switch, where as the disable() verison
* it works like an on/off switch, where as the disable() version
* must be paired with a enable().
*/
void ring_buffer_record_off(struct ring_buffer *buffer)
@ -2839,7 +2839,7 @@ EXPORT_SYMBOL_GPL(ring_buffer_record_off);
* ring_buffer_record_off().
*
* This is different than ring_buffer_record_enable() as
* it works like an on/off switch, where as the enable() verison
* it works like an on/off switch, where as the enable() version
* must be paired with a disable().
*/
void ring_buffer_record_on(struct ring_buffer *buffer)

6
kernel/trace/trace.c
View File

@ -426,15 +426,15 @@ __setup("trace_buf_size=", set_buf_size);
static int __init set_tracing_thresh(char *str)
{
unsigned long threshhold;
unsigned long threshold;
int ret;
if (!str)
return 0;
ret = strict_strtoul(str, 0, &threshhold);
ret = strict_strtoul(str, 0, &threshold);
if (ret < 0)
return 0;
tracing_thresh = threshhold * 1000;
tracing_thresh = threshold * 1000;
return 1;
}
__setup("tracing_thresh=", set_tracing_thresh);

2
kernel/trace/trace_events_filter.c
View File

@ -2002,7 +2002,7 @@ static int ftrace_function_set_regexp(struct ftrace_ops *ops, int filter,
static int __ftrace_function_set_filter(int filter, char *buf, int len,
struct function_filter_data *data)
{
int i, re_cnt, ret;
int i, re_cnt, ret = -EINVAL;
int *reset;
char **re;

27
kernel/trace/trace_selftest.c
View File

@ -1041,6 +1041,8 @@ static int trace_wakeup_test_thread(void *data)
set_current_state(TASK_INTERRUPTIBLE);
schedule();
complete(x);
/* we are awake, now wait to disappear */
while (!kthread_should_stop()) {
/*
@ -1084,24 +1086,21 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
/* reset the max latency */
tracing_max_latency = 0;
/* sleep to let the RT thread sleep too */
msleep(100);
while (p->on_rq) {
/*
* Sleep to make sure the RT thread is asleep too.
* On virtual machines we can't rely on timings,
* but we want to make sure this test still works.
*/
msleep(100);
}
/*
* Yes this is slightly racy. It is possible that for some
* strange reason that the RT thread we created, did not
* call schedule for 100ms after doing the completion,
* and we do a wakeup on a task that already is awake.
* But that is extremely unlikely, and the worst thing that
* happens in such a case, is that we disable tracing.
* Honestly, if this race does happen something is horrible
* wrong with the system.
*/
init_completion(&isrt);
wake_up_process(p);
/* give a little time to let the thread wake up */
msleep(100);
/* Wait for the task to wake up */
wait_for_completion(&isrt);
/* stop the tracing. */
tracing_stop();