| /* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| #include <asm/thread_notify.h> |
| #define CREATE_TRACE_POINTS |
| #include "perf_trace_counters.h" |
| |
| static int tracectr_notifier(struct notifier_block *self, unsigned long cmd, |
| void *v) |
| { |
| static int old_pid = -1; |
| struct thread_info *thread = v; |
| int current_pid; |
| |
| if (cmd != THREAD_NOTIFY_SWITCH) |
| return old_pid; |
| |
| current_pid = thread->task->pid; |
| if (old_pid != -1) |
| trace_sched_switch_with_ctrs(old_pid, current_pid); |
| old_pid = current_pid; |
| return old_pid; |
| } |
| |
| static struct notifier_block tracectr_notifier_block = { |
| .notifier_call = tracectr_notifier, |
| }; |
| |
| int __init init_tracecounters(void) |
| { |
| thread_register_notifier(&tracectr_notifier_block); |
| return 0; |
| } |
| late_initcall(init_tracecounters); |