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