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authorIngo Molnar <mingo@elte.hu>2008-05-12 21:20:47 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-05-23 23:39:00 +0200
commitf06c38103ea9dbca27c3f4d77f444ddefb5477cd (patch)
tree9452cf51a1acb2a2019d1680668d051370b08981 /kernel/trace
parent677aa9f77e8de3791b481a0cec6c8b84d1eec626 (diff)
downloadop-kernel-dev-f06c38103ea9dbca27c3f4d77f444ddefb5477cd.zip
op-kernel-dev-f06c38103ea9dbca27c3f4d77f444ddefb5477cd.tar.gz
ftrace: add sysprof plugin
very first baby version. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/Kconfig8
-rw-r--r--kernel/trace/Makefile1
-rw-r--r--kernel/trace/trace_sysprof.c80
3 files changed, 89 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 5c2295b..e101c9a 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 d9efbbf..7aec123 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 0000000..6c139bc
--- /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);
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