diff options
| -rw-r--r-- | kernel/trace/Kconfig | 8 | ||||
| -rw-r--r-- | kernel/trace/Makefile | 1 | ||||
| -rw-r--r-- | kernel/trace/trace_sysprof.c | 80 |
3 files changed, 89 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 5c2295b29f2c..e101c9a85f0f 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -75,6 +75,14 @@ config PREEMPT_TRACER enabled. This option and the irqs-off timing option can be used together or separately.) +config SYSPROF_TRACER + bool "Sysprof Tracer" + depends on DEBUG_KERNEL + select TRACING + help + This tracer provides the trace needed by the 'Sysprof' userspace + tool. + config SCHED_TRACER bool "Scheduling Latency Tracer" depends on HAVE_FTRACE diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile index d9efbbfa2bdf..7aec123ec1d8 100644 --- a/kernel/trace/Makefile +++ b/kernel/trace/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_FTRACE) += libftrace.o obj-$(CONFIG_TRACING) += trace.o obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o +obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o obj-$(CONFIG_FTRACE) += trace_functions.o obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c new file mode 100644 index 000000000000..6c139bc1be7e --- /dev/null +++ b/kernel/trace/trace_sysprof.c @@ -0,0 +1,80 @@ +/* + * trace stack traces + * + * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com> + * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> + * + */ +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/debugfs.h> +#include <linux/kallsyms.h> +#include <linux/uaccess.h> +#include <linux/marker.h> +#include <linux/ftrace.h> + +#include "trace.h" + +static struct trace_array *ctx_trace; +static int __read_mostly tracer_enabled; + +static notrace void stack_reset(struct trace_array *tr) +{ + int cpu; + + tr->time_start = ftrace_now(tr->cpu); + + for_each_online_cpu(cpu) + tracing_reset(tr->data[cpu]); +} + +static notrace void start_stack_trace(struct trace_array *tr) +{ + stack_reset(tr); + tracer_enabled = 1; +} + +static notrace void stop_stack_trace(struct trace_array *tr) +{ + tracer_enabled = 0; +} + +static notrace void stack_trace_init(struct trace_array *tr) +{ + ctx_trace = tr; + + if (tr->ctrl) + start_stack_trace(tr); +} + +static notrace void stack_trace_reset(struct trace_array *tr) +{ + if (tr->ctrl) + stop_stack_trace(tr); +} + +static void stack_trace_ctrl_update(struct trace_array *tr) +{ + /* When starting a new trace, reset the buffers */ + if (tr->ctrl) + start_stack_trace(tr); + else + stop_stack_trace(tr); +} + +static struct tracer stack_trace __read_mostly = +{ + .name = "sysprof", + .init = stack_trace_init, + .reset = stack_trace_reset, + .ctrl_update = stack_trace_ctrl_update, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_stack, +#endif +}; + +__init static int init_stack_trace(void) +{ + return register_tracer(&stack_trace); +} +device_initcall(init_stack_trace); |
