tracing: Use pause-on-trace with the latency tracers

[sfrench/cifs-2.6.git] / kernel / trace / trace_irqsoff.c

diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index d06aab4dcbb8f41fe9929197b509bfad94f6e99b..6756379b661fee56125f1ea81e8106ddbb1f6887 100644 (file)
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -562,6 +562,8 @@ static int __irqsoff_tracer_init(struct trace_array *tr)
        /* non overwrite screws up the latency tracers */
        set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1);
        set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1);
+       /* without pause, we will produce garbage if another latency occurs */
+       set_tracer_flag(tr, TRACE_ITER_PAUSE_ON_TRACE, 1);
 
        tr->max_latency = 0;
        irqsoff_trace = tr;
@@ -583,11 +585,13 @@ static void __irqsoff_tracer_reset(struct trace_array *tr)
 {
        int lat_flag = save_flags & TRACE_ITER_LATENCY_FMT;
        int overwrite_flag = save_flags & TRACE_ITER_OVERWRITE;
+       int pause_flag = save_flags & TRACE_ITER_PAUSE_ON_TRACE;
 
        stop_irqsoff_tracer(tr, is_graph(tr));
 
        set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);
        set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);
+       set_tracer_flag(tr, TRACE_ITER_PAUSE_ON_TRACE, pause_flag);
        ftrace_reset_array_ops(tr);
 
        irqsoff_busy = false;