M7350/kernel/arch/arm/mach-msm/perf_trace_counters.c
2024-09-09 08:52:07 +00:00

43 lines
1.2 KiB
C

/* 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);