diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-07-18 22:50:34 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2008-07-18 22:50:34 +0200 |
commit | a208f37a465e222218974ab20a31b42b7b4893b2 (patch) | |
tree | 77c6acdd4be32024330a14f2618b814126ce7a20 /kernel/trace/trace_functions.c | |
parent | x86: apic_ops for lguest (diff) | |
parent | Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
download | linux-a208f37a465e222218974ab20a31b42b7b4893b2.tar.xz linux-a208f37a465e222218974ab20a31b42b7b4893b2.zip |
Merge branch 'linus' into x86/x2apic
Diffstat (limited to 'kernel/trace/trace_functions.c')
-rw-r--r-- | kernel/trace/trace_functions.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c new file mode 100644 index 000000000000..312144897970 --- /dev/null +++ b/kernel/trace/trace_functions.c @@ -0,0 +1,81 @@ +/* + * ring buffer based function tracer + * + * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> + * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> + * + * Based on code from the latency_tracer, that is: + * + * Copyright (C) 2004-2006 Ingo Molnar + * Copyright (C) 2004 William Lee Irwin III + */ +#include <linux/debugfs.h> +#include <linux/uaccess.h> +#include <linux/ftrace.h> +#include <linux/fs.h> + +#include "trace.h" + +static void function_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 void start_function_trace(struct trace_array *tr) +{ + tr->cpu = get_cpu(); + function_reset(tr); + put_cpu(); + + tracing_start_cmdline_record(); + tracing_start_function_trace(); +} + +static void stop_function_trace(struct trace_array *tr) +{ + tracing_stop_function_trace(); + tracing_stop_cmdline_record(); +} + +static void function_trace_init(struct trace_array *tr) +{ + if (tr->ctrl) + start_function_trace(tr); +} + +static void function_trace_reset(struct trace_array *tr) +{ + if (tr->ctrl) + stop_function_trace(tr); +} + +static void function_trace_ctrl_update(struct trace_array *tr) +{ + if (tr->ctrl) + start_function_trace(tr); + else + stop_function_trace(tr); +} + +static struct tracer function_trace __read_mostly = +{ + .name = "ftrace", + .init = function_trace_init, + .reset = function_trace_reset, + .ctrl_update = function_trace_ctrl_update, +#ifdef CONFIG_FTRACE_SELFTEST + .selftest = trace_selftest_startup_function, +#endif +}; + +static __init int init_function_trace(void) +{ + return register_tracer(&function_trace); +} + +device_initcall(init_function_trace); |