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Merge "sched/walt: Improve the scheduler"

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This commit is contained in:
qctecmdr 2020-06-20 10:46:40 -07:00 • committed by Gerrit - the friendly Code Review server
commit d5bf014032
3 changed files with 23 additions and 12 deletions
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11
kernel/sched/core.c
View file

@ -2489,7 +2489,8 @@ static void ttwu_queue(struct task_struct *p, int cpu, int wake_flags)
struct rq_flags rf;
#if defined(CONFIG_SMP)
if (sched_feat(TTWU_QUEUE) && !cpus_share_cache(smp_processor_id(), cpu)) {
if ((sched_feat(TTWU_QUEUE) && !cpus_share_cache(smp_processor_id(), cpu)) ||
walt_want_remote_wakeup()) {
sched_clock_cpu(cpu); /* Sync clocks across CPUs */
ttwu_queue_remote(p, cpu, wake_flags);
return;
@ -5650,7 +5651,7 @@ bool is_sched_lib_based_app(pid_t pid)
char *libname, *lib_list;
struct vm_area_struct *vma;
char path_buf[LIB_PATH_LENGTH];
char tmp_lib_name[LIB_PATH_LENGTH];
char *tmp_lib_name;
bool found = false;
struct task_struct *p;
struct mm_struct *mm;
@ -5658,11 +5659,16 @@ bool is_sched_lib_based_app(pid_t pid)
if (strnlen(sched_lib_name, LIB_PATH_LENGTH) == 0)
return false;
tmp_lib_name = kmalloc(LIB_PATH_LENGTH, GFP_KERNEL);
if (!tmp_lib_name)
return false;
rcu_read_lock();
p = find_process_by_pid(pid);
if (!p) {
rcu_read_unlock();
kfree(tmp_lib_name);
return false;
}
@ -5700,6 +5706,7 @@ release_sem:
mmput(mm);
put_task_struct:
put_task_struct(p);
kfree(tmp_lib_name);
return found;
}

11
kernel/sched/fair.c
View file

@ -6499,7 +6499,6 @@ enum fastpaths {
NONE = 0,
SYNC_WAKEUP,
PREV_CPU_FASTPATH,
MANY_WAKEUP,
};
static void walt_find_best_target(struct sched_domain *sd, cpumask_t *cpus,
@ -6950,6 +6949,9 @@ int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu,
bool boosted = is_uclamp_boosted || (task_boost > 0);
int start_cpu, order_index, end_index;
if (walt_is_many_wakeup(sibling_count_hint) && prev_cpu != cpu &&
cpumask_test_cpu(prev_cpu, &p->cpus_mask))
return prev_cpu;
if (unlikely(!cpu_array))
goto eas_not_ready;
@ -6979,13 +6981,6 @@ int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu,
goto done;
}
if (walt_is_many_wakeup(sibling_count_hint) && prev_cpu != cpu &&
bias_to_this_cpu(p, prev_cpu, start_cpu)) {
best_energy_cpu = prev_cpu;
fbt_env.fastpath = MANY_WAKEUP;
goto done;
}
rcu_read_lock();
pd = rcu_dereference(rd->pd);
if (!pd)

13
kernel/sched/sched.h
View file

@ -2859,6 +2859,12 @@ enum sched_boost_policy {
#ifdef CONFIG_SCHED_WALT
#define WALT_MANY_WAKEUP_DEFAULT 1000
static inline bool walt_want_remote_wakeup(void)
{
return sysctl_sched_many_wakeup_threshold < WALT_MANY_WAKEUP_DEFAULT;
}
static inline int cluster_first_cpu(struct walt_sched_cluster *cluster)
{
return cpumask_first(&cluster->cpus);
@ -2996,7 +3002,6 @@ static inline int same_freq_domain(int src_cpu, int dst_cpu)
#define CPU_RESERVED 1
extern enum sched_boost_policy __weak boost_policy;
extern unsigned int __weak sched_task_filter_util;
static inline enum sched_boost_policy sched_boost_policy(void)
{
return boost_policy;
@ -3120,7 +3125,7 @@ static inline enum sched_boost_policy task_boost_policy(struct task_struct *p)
* under conservative boost.
*/
if (sched_boost() == CONSERVATIVE_BOOST &&
task_util(p) <= sched_task_filter_util)
task_util(p) <= sysctl_sched_min_task_util_for_boost)
policy = SCHED_BOOST_NONE;
}
@ -3268,6 +3273,10 @@ static inline bool early_detection_notify(struct rq *rq, u64 wallclock)
}
static inline void note_task_waking(struct task_struct *p, u64 wallclock) { }
static inline bool walt_want_remote_wakeup(void)
{
return false;
}
#endif /* CONFIG_SCHED_WALT */
struct sched_avg_stats {