ftrace: add sysprof plugin

very first baby version.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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);