| Ashwin Chaugule | 4eaee1a | 2013-03-14 18:37:49 -0400 | [diff] [blame] | 1 | /* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | #include <asm/thread_notify.h> |
| 13 | #define CREATE_TRACE_POINTS |
| 14 | #include "perf_trace_counters.h" |
| 15 | |
| 16 | static int tracectr_notifier(struct notifier_block *self, unsigned long cmd, |
| 17 | void *v) |
| 18 | { |
| 19 | static int old_pid = -1; |
| 20 | struct thread_info *thread = v; |
| 21 | int current_pid; |
| 22 | |
| 23 | if (cmd != THREAD_NOTIFY_SWITCH) |
| 24 | return old_pid; |
| 25 | |
| 26 | current_pid = thread->task->pid; |
| 27 | if (old_pid != -1) |
| 28 | trace_sched_switch_with_ctrs(old_pid, current_pid); |
| 29 | old_pid = current_pid; |
| 30 | return old_pid; |
| 31 | } |
| 32 | |
| 33 | static struct notifier_block tracectr_notifier_block = { |
| 34 | .notifier_call = tracectr_notifier, |
| 35 | }; |
| 36 | |
| 37 | int __init init_tracecounters(void) |
| 38 | { |
| 39 | thread_register_notifier(&tracectr_notifier_block); |
| 40 | return 0; |
| 41 | } |
| 42 | late_initcall(init_tracecounters); |