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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-01-14 15:32:58 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-04-21 19:59:29 +0200 |
| commit | 02f2f7646fd5d0482e805d728601e8e4305ad56f (patch) | |
| tree | 345ca10d0e605a4b68d8146e5066dc0b18e3ec76 /kernel/trace | |
| parent | tracing: Allow wakeup tracers to be used by instances (diff) | |
| download | linux-02f2f7646fd5d0482e805d728601e8e4305ad56f.tar.xz linux-02f2f7646fd5d0482e805d728601e8e4305ad56f.zip | |
tracing: Allow irq/preempt tracers to be used by instances
The irqsoff, preemptoff and preemptirqsoff tracers can now be used by
instances. But they may only be used by one instance at a time (including
the top level directory). This allows multiple tracers to run while the
irqsoff (and friends) tracer is running simultaneously.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_irqsoff.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c index 40aa300d3491..9bb104f748d0 100644 --- a/kernel/trace/trace_irqsoff.c +++ b/kernel/trace/trace_irqsoff.c @@ -597,8 +597,13 @@ static void stop_irqsoff_tracer(struct trace_array *tr, int graph) unregister_irqsoff_function(tr, graph); } -static void __irqsoff_tracer_init(struct trace_array *tr) +static bool irqsoff_busy; + +static int __irqsoff_tracer_init(struct trace_array *tr) { + if (irqsoff_busy) + return -EBUSY; + save_flags = trace_flags; /* non overwrite screws up the latency tracers */ @@ -617,6 +622,9 @@ static void __irqsoff_tracer_init(struct trace_array *tr) if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL && is_graph()))) printk(KERN_ERR "failed to start irqsoff tracer\n"); + + irqsoff_busy = true; + return 0; } static void irqsoff_tracer_reset(struct trace_array *tr) @@ -629,6 +637,8 @@ static void irqsoff_tracer_reset(struct trace_array *tr) set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag); set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag); ftrace_reset_array_ops(tr); + + irqsoff_busy = false; } static void irqsoff_tracer_start(struct trace_array *tr) @@ -646,8 +656,7 @@ static int irqsoff_tracer_init(struct trace_array *tr) { trace_type = TRACER_IRQS_OFF; - __irqsoff_tracer_init(tr); - return 0; + return __irqsoff_tracer_init(tr); } static struct tracer irqsoff_tracer __read_mostly = { @@ -667,6 +676,7 @@ static struct tracer irqsoff_tracer __read_mostly = #endif .open = irqsoff_trace_open, .close = irqsoff_trace_close, + .allow_instances = true, .use_max_tr = true, }; # define register_irqsoff(trace) register_tracer(&trace) @@ -679,8 +689,7 @@ static int preemptoff_tracer_init(struct trace_array *tr) { trace_type = TRACER_PREEMPT_OFF; - __irqsoff_tracer_init(tr); - return 0; + return __irqsoff_tracer_init(tr); } static struct tracer preemptoff_tracer __read_mostly = @@ -701,6 +710,7 @@ static struct tracer preemptoff_tracer __read_mostly = #endif .open = irqsoff_trace_open, .close = irqsoff_trace_close, + .allow_instances = true, .use_max_tr = true, }; # define register_preemptoff(trace) register_tracer(&trace) @@ -715,8 +725,7 @@ static int preemptirqsoff_tracer_init(struct trace_array *tr) { trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF; - __irqsoff_tracer_init(tr); - return 0; + return __irqsoff_tracer_init(tr); } static struct tracer preemptirqsoff_tracer __read_mostly = @@ -737,6 +746,7 @@ static struct tracer preemptirqsoff_tracer __read_mostly = #endif .open = irqsoff_trace_open, .close = irqsoff_trace_close, + .allow_instances = true, .use_max_tr = true, }; |