Commit b8de7bd1 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt
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tracing: disable update max tracer while reading trace



When reading the tracer from the trace file, updating the max latency
may corrupt the output. This patch disables the tracing of the max
latency while reading the trace file.
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 8248ac05
...@@ -263,6 +263,9 @@ unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | ...@@ -263,6 +263,9 @@ unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME |
TRACE_ITER_GRAPH_TIME; TRACE_ITER_GRAPH_TIME;
static int trace_stop_count;
static DEFINE_SPINLOCK(tracing_start_lock);
/** /**
* trace_wake_up - wake up tasks waiting for trace input * trace_wake_up - wake up tasks waiting for trace input
* *
...@@ -442,6 +445,9 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) ...@@ -442,6 +445,9 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{ {
struct ring_buffer *buf = tr->buffer; struct ring_buffer *buf = tr->buffer;
if (trace_stop_count)
return;
WARN_ON_ONCE(!irqs_disabled()); WARN_ON_ONCE(!irqs_disabled());
__raw_spin_lock(&ftrace_max_lock); __raw_spin_lock(&ftrace_max_lock);
...@@ -469,6 +475,9 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) ...@@ -469,6 +475,9 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
{ {
int ret; int ret;
if (trace_stop_count)
return;
WARN_ON_ONCE(!irqs_disabled()); WARN_ON_ONCE(!irqs_disabled());
__raw_spin_lock(&ftrace_max_lock); __raw_spin_lock(&ftrace_max_lock);
...@@ -685,9 +694,6 @@ static void trace_init_cmdlines(void) ...@@ -685,9 +694,6 @@ static void trace_init_cmdlines(void)
cmdline_idx = 0; cmdline_idx = 0;
} }
static int trace_stop_count;
static DEFINE_SPINLOCK(tracing_start_lock);
/** /**
* ftrace_off_permanent - disable all ftrace code permanently * ftrace_off_permanent - disable all ftrace code permanently
* *
......
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