diff options
Diffstat (limited to 'kernel/trace/trace_irqsoff.c')
| -rw-r--r-- | kernel/trace/trace_irqsoff.c | 85 |
1 files changed, 64 insertions, 21 deletions
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c index 443b25b43b4f..b19d065a28cb 100644 --- a/kernel/trace/trace_irqsoff.c +++ b/kernel/trace/trace_irqsoff.c @@ -33,6 +33,7 @@ enum { static int trace_type __read_mostly; static int save_flags; +static bool function_enabled; static void stop_irqsoff_tracer(struct trace_array *tr, int graph); static int start_irqsoff_tracer(struct trace_array *tr, int graph); @@ -121,7 +122,7 @@ static int func_prolog_dec(struct trace_array *tr, if (!irqs_disabled_flags(*flags)) return 0; - *data = tr->data[cpu]; + *data = per_cpu_ptr(tr->trace_buffer.data, cpu); disabled = atomic_inc_return(&(*data)->disabled); if (likely(disabled == 1)) @@ -175,7 +176,7 @@ static int irqsoff_set_flag(u32 old_flags, u32 bit, int set) per_cpu(tracing_cpu, cpu) = 0; tracing_max_latency = 0; - tracing_reset_online_cpus(irqsoff_trace); + tracing_reset_online_cpus(&irqsoff_trace->trace_buffer); return start_irqsoff_tracer(irqsoff_trace, set); } @@ -380,7 +381,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip) if (per_cpu(tracing_cpu, cpu)) return; - data = tr->data[cpu]; + data = per_cpu_ptr(tr->trace_buffer.data, cpu); if (unlikely(!data) || atomic_read(&data->disabled)) return; @@ -418,7 +419,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip) if (!tracer_enabled) return; - data = tr->data[cpu]; + data = per_cpu_ptr(tr->trace_buffer.data, cpu); if (unlikely(!data) || !data->critical_start || atomic_read(&data->disabled)) @@ -528,15 +529,60 @@ void trace_preempt_off(unsigned long a0, unsigned long a1) } #endif /* CONFIG_PREEMPT_TRACER */ -static int start_irqsoff_tracer(struct trace_array *tr, int graph) +static int register_irqsoff_function(int graph, int set) { - int ret = 0; + int ret; - if (!graph) - ret = register_ftrace_function(&trace_ops); - else + /* 'set' is set if TRACE_ITER_FUNCTION is about to be set */ + if (function_enabled || (!set && !(trace_flags & TRACE_ITER_FUNCTION))) + return 0; + + if (graph) ret = register_ftrace_graph(&irqsoff_graph_return, &irqsoff_graph_entry); + else + ret = register_ftrace_function(&trace_ops); + + if (!ret) + function_enabled = true; + + return ret; +} + +static void unregister_irqsoff_function(int graph) +{ + if (!function_enabled) + return; + + if (graph) + unregister_ftrace_graph(); + else + unregister_ftrace_function(&trace_ops); + + function_enabled = false; +} + +static void irqsoff_function_set(int set) +{ + if (set) + register_irqsoff_function(is_graph(), 1); + else + unregister_irqsoff_function(is_graph()); +} + +static int irqsoff_flag_changed(struct tracer *tracer, u32 mask, int set) +{ + if (mask & TRACE_ITER_FUNCTION) + irqsoff_function_set(set); + + return trace_keep_overwrite(tracer, mask, set); +} + +static int start_irqsoff_tracer(struct trace_array *tr, int graph) +{ + int ret; + + ret = register_irqsoff_function(graph, 0); if (!ret && tracing_is_enabled()) tracer_enabled = 1; @@ -550,10 +596,7 @@ static void stop_irqsoff_tracer(struct trace_array *tr, int graph) { tracer_enabled = 0; - if (!graph) - unregister_ftrace_function(&trace_ops); - else - unregister_ftrace_graph(); + unregister_irqsoff_function(graph); } static void __irqsoff_tracer_init(struct trace_array *tr) @@ -561,14 +604,14 @@ static void __irqsoff_tracer_init(struct trace_array *tr) save_flags = trace_flags; /* non overwrite screws up the latency tracers */ - set_tracer_flag(TRACE_ITER_OVERWRITE, 1); - set_tracer_flag(TRACE_ITER_LATENCY_FMT, 1); + set_tracer_flag(tr, TRACE_ITER_OVERWRITE, 1); + set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, 1); tracing_max_latency = 0; irqsoff_trace = tr; /* make sure that the tracer is visible */ smp_wmb(); - tracing_reset_online_cpus(tr); + tracing_reset_online_cpus(&tr->trace_buffer); if (start_irqsoff_tracer(tr, is_graph())) printk(KERN_ERR "failed to start irqsoff tracer\n"); @@ -581,8 +624,8 @@ static void irqsoff_tracer_reset(struct trace_array *tr) stop_irqsoff_tracer(tr, is_graph()); - set_tracer_flag(TRACE_ITER_LATENCY_FMT, lat_flag); - set_tracer_flag(TRACE_ITER_OVERWRITE, overwrite_flag); + set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag); + set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag); } static void irqsoff_tracer_start(struct trace_array *tr) @@ -615,7 +658,7 @@ static struct tracer irqsoff_tracer __read_mostly = .print_line = irqsoff_print_line, .flags = &tracer_flags, .set_flag = irqsoff_set_flag, - .flag_changed = trace_keep_overwrite, + .flag_changed = irqsoff_flag_changed, #ifdef CONFIG_FTRACE_SELFTEST .selftest = trace_selftest_startup_irqsoff, #endif @@ -649,7 +692,7 @@ static struct tracer preemptoff_tracer __read_mostly = .print_line = irqsoff_print_line, .flags = &tracer_flags, .set_flag = irqsoff_set_flag, - .flag_changed = trace_keep_overwrite, + .flag_changed = irqsoff_flag_changed, #ifdef CONFIG_FTRACE_SELFTEST .selftest = trace_selftest_startup_preemptoff, #endif @@ -685,7 +728,7 @@ static struct tracer preemptirqsoff_tracer __read_mostly = .print_line = irqsoff_print_line, .flags = &tracer_flags, .set_flag = irqsoff_set_flag, - .flag_changed = trace_keep_overwrite, + .flag_changed = irqsoff_flag_changed, #ifdef CONFIG_FTRACE_SELFTEST .selftest = trace_selftest_startup_preemptirqsoff, #endif |