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/* Copyright (c) 2012-2016, 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 "sched.h"
/*
* Scheduler boost is a mechanism to temporarily place tasks on CPUs
* with higher capacity than those where a task would have normally
* ended up with their load characteristics. Any entity enabling
* boost is responsible for disabling it as well.
*/
unsigned int sysctl_sched_boost;
#ifdef CONFIG_DYNAMIC_STUNE_BOOST
static int boost_slot;
#endif // CONFIG_DYNAMIC_STUNE_BOOST
static bool verify_boost_params(int old_val, int new_val)
{
/*
* Boost can only be turned on or off. There is no possiblity of
* switching from one boost type to another or to set the same
* kind of boost several times.
*/
return !(!!old_val == !!new_val);
}
int sched_boost_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
int ret;
unsigned int *data = (unsigned int *)table->data;
unsigned int old_val;
// Backup current sysctl_sched_boost value
old_val = *data;
// Set new sysctl_sched_boost value
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (ret || !write)
goto done;
#ifdef CONFIG_DYNAMIC_STUNE_BOOST
if (verify_boost_params(old_val, *data)) {
if (*data > 0)
do_stune_sched_boost("top-app", &boost_slot);
else
reset_stune_boost("top-app", boost_slot);
} else {
*data = old_val;
ret = -EINVAL;
}
#endif // CONFIG_DYNAMIC_STUNE_BOOST
done:
return ret;
}
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