projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| fb1b6d8b SN |
1 | /* |
| 2 | * nop tracer | |
| 3 | * | |
| 4 | * Copyright (C) 2008 Steven Noonan <steven@uplinklabs.net> | |
| 5 | * | |
| 6 | */ | |
| 7 | ||
| 8 | #include <linux/module.h> | |
| 9 | #include <linux/fs.h> | |
| 10 | #include <linux/debugfs.h> | |
| 11 | #include <linux/ftrace.h> | |
| 12 | ||
| 13 | #include "trace.h" | |
| 14 | ||
| 15 | static struct trace_array *ctx_trace; | |
| 16 | ||
| 17 | static void start_nop_trace(struct trace_array *tr) | |
| 18 | { | |
| 19 | /* Nothing to do! */ | |
| 20 | } | |
| 21 | ||
| 22 | static void stop_nop_trace(struct trace_array *tr) | |
| 23 | { | |
| 24 | /* Nothing to do! */ | |
| 25 | } | |
| 26 | ||
| 27 | static void nop_trace_init(struct trace_array *tr) | |
| 28 | { | |
| 35cb5ed0 | 29 | int cpu; |
| fb1b6d8b SN |
30 | ctx_trace = tr; |
| 31 | ||
| 35cb5ed0 | 32 | for_each_online_cpu(cpu) |
| 3928a8a2 | 33 | tracing_reset(tr, cpu); |
| 35cb5ed0 | 34 | |
| fb1b6d8b SN |
35 | if (tr->ctrl) |
| 36 | start_nop_trace(tr); | |
| 37 | } | |
| 38 | ||
| 39 | static void nop_trace_reset(struct trace_array *tr) | |
| 40 | { | |
| 41 | if (tr->ctrl) | |
| 42 | stop_nop_trace(tr); | |
| 43 | } | |
| 44 | ||
| 45 | static void nop_trace_ctrl_update(struct trace_array *tr) | |
| 46 | { | |
| 47 | /* When starting a new trace, reset the buffers */ | |
| 48 | if (tr->ctrl) | |
| 49 | start_nop_trace(tr); | |
| 50 | else | |
| 51 | stop_nop_trace(tr); | |
| 52 | } | |
| 53 | ||
| 43a15386 | 54 | struct tracer nop_trace __read_mostly = |
| fb1b6d8b SN |
55 | { |
| 56 | .name = "nop", | |
| 57 | .init = nop_trace_init, | |
| 58 | .reset = nop_trace_reset, | |
| 59 | .ctrl_update = nop_trace_ctrl_update, | |
| 60 | #ifdef CONFIG_FTRACE_SELFTEST | |
| 61 | .selftest = trace_selftest_startup_nop, | |
| 62 | #endif | |
| 63 | }; | |
| 64 |