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sched/walt: Improve the scheduler

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This change is for general scheduler improvement.

Change-Id: I8459bcf7b412a5f301566054c28c910567548485
Signed-off-by: Sai Harshini Nimmala <snimmala@codeaurora.org>
This commit is contained in:
Sai Harshini Nimmala 2019-10-25 12:06:33 -07:00
parent dd8171dd87
commit e2c44d5b41
4 changed files with 80 additions and 0 deletions
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6
include/linux/sched/sysctl.h
View file

@ -53,6 +53,7 @@ extern unsigned int sysctl_sched_coloc_busy_hyst_enable_cpus;
extern unsigned int sysctl_sched_coloc_busy_hyst;
extern unsigned int sysctl_sched_coloc_busy_hyst_max_ms;
extern unsigned int sysctl_sched_window_stats_policy;
extern unsigned int sysctl_sched_ravg_window_nr_ticks;
extern int
walt_proc_group_thresholds_handler(struct ctl_table *table, int write,
@ -63,6 +64,11 @@ walt_proc_user_hint_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
extern int
sched_ravg_window_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
#endif
#if defined(CONFIG_PREEMPT_TRACER) || defined(CONFIG_DEBUG_PREEMPT)

4
include/linux/sysctl.h
View file

@ -67,6 +67,10 @@ extern int proc_douintvec_capacity(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
extern int proc_douintvec_ravg_window(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos);
/*
* Register a set of sysctl names by calling register_sysctl_table
* with an initialised array of struct ctl_table's. An entry with

34
kernel/sched/walt.c
View file

@ -108,6 +108,8 @@ static void release_rq_locks_irqrestore(const cpumask_t *cpus,
/* Max window size (in ns) = 1s */
#define MAX_SCHED_RAVG_WINDOW 1000000000
#define NR_WINDOWS_PER_SEC (NSEC_PER_SEC / MIN_SCHED_RAVG_WINDOW)
__read_mostly unsigned int sysctl_sched_cpu_high_irqload = (10 * NSEC_PER_MSEC);
unsigned int sysctl_sched_walt_rotate_big_tasks;
@ -121,6 +123,9 @@ static __read_mostly unsigned int sched_io_is_busy = 1;
__read_mostly unsigned int sysctl_sched_window_stats_policy =
WINDOW_STATS_MAX_RECENT_AVG;
__read_mostly unsigned int sysctl_sched_ravg_window_nr_ticks =
(HZ / NR_WINDOWS_PER_SEC);
/* Window size (in ns) */
__read_mostly unsigned int sched_ravg_window = MIN_SCHED_RAVG_WINDOW;
__read_mostly unsigned int new_sched_ravg_window = MIN_SCHED_RAVG_WINDOW;
@ -3552,3 +3557,32 @@ int walt_proc_user_hint_handler(struct ctl_table *table,
mutex_unlock(&mutex);
return ret;
}
static inline void sched_window_nr_ticks_change(int new_nr_ticks)
{
new_sched_ravg_window = new_nr_ticks * (NSEC_PER_SEC / HZ);
}
int sched_ravg_window_handler(struct ctl_table *table,
int write, void __user *buffer, size_t *lenp,
loff_t *ppos)
{
int ret;
static DEFINE_MUTEX(mutex);
unsigned int prev_value;
mutex_lock(&mutex);
prev_value = sysctl_sched_ravg_window_nr_ticks;
ret = proc_douintvec_ravg_window(table, write, buffer, lenp, ppos);
if (ret || !write ||
(prev_value == sysctl_sched_ravg_window_nr_ticks) ||
(sysctl_sched_ravg_window_nr_ticks == 0))
goto unlock;
sched_window_nr_ticks_change(sysctl_sched_ravg_window_nr_ticks);
unlock:
mutex_unlock(&mutex);
return ret;
}

36
kernel/sysctl.c
View file

@ -511,6 +511,13 @@ static struct ctl_table kern_table[] = {
.extra1 = &zero,
.extra2 = &one_hundred_thousand,
},
{
.procname = "sched_ravg_window_nr_ticks",
.data = &sysctl_sched_ravg_window_nr_ticks,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = sched_ravg_window_handler,
},
#endif
#ifdef CONFIG_SMP
{
@ -3544,6 +3551,29 @@ int proc_douintvec_capacity(struct ctl_table *table, int write,
do_proc_douintvec_capacity_conv, NULL);
}
static int do_proc_douintvec_rwin(bool *negp, unsigned long *lvalp,
int *valp, int write, void *data)
{
if (write) {
if (*lvalp == 0 || *lvalp == 2 || *lvalp == 5)
*valp = *lvalp;
else
return -EINVAL;
} else {
*negp = false;
*lvalp = *valp;
}
return 0;
}
int proc_douintvec_ravg_window(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
return do_proc_dointvec(table, write, buffer, lenp, ppos,
do_proc_douintvec_rwin, NULL);
}
#else /* CONFIG_PROC_SYSCTL */
int proc_dostring(struct ctl_table *table, int write,
@ -3613,6 +3643,12 @@ int proc_douintvec_capacity(struct ctl_table *table, int write,
return -ENOSYS;
}
int proc_douintvec_ravg_window(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
return -ENOSYS;
}
#endif /* CONFIG_PROC_SYSCTL */
/*