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author | Ingo Molnar <mingo@elte.hu> | 2008-05-12 19:20:47 (GMT) |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-23 21:39:00 (GMT) |
commit | f06c38103ea9dbca27c3f4d77f444ddefb5477cd (patch) | |
tree | 9452cf51a1acb2a2019d1680668d051370b08981 /kernel/trace/trace_sysprof.c | |
parent | 677aa9f77e8de3791b481a0cec6c8b84d1eec626 (diff) | |
download | linux-fsl-qoriq-f06c38103ea9dbca27c3f4d77f444ddefb5477cd.tar.xz |
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/trace_sysprof.c')
-rw-r--r-- | kernel/trace/trace_sysprof.c | 80 |
1 files changed, 80 insertions, 0 deletions
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); |