From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/kernel/sched/fair.c | 294 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 256 insertions(+), 38 deletions(-)
diff --git a/kernel/kernel/sched/fair.c b/kernel/kernel/sched/fair.c
index 8ef2f84..8c74c2f 100644
--- a/kernel/kernel/sched/fair.c
+++ b/kernel/kernel/sched/fair.c
@@ -3938,14 +3938,16 @@
}
#ifdef CONFIG_UCLAMP_TASK
-static inline unsigned long uclamp_task_util(struct task_struct *p)
+static inline unsigned long uclamp_task_util(struct task_struct *p,
+ unsigned long uclamp_min,
+ unsigned long uclamp_max)
{
- return clamp(task_util_est(p),
- uclamp_eff_value(p, UCLAMP_MIN),
- uclamp_eff_value(p, UCLAMP_MAX));
+ return clamp(task_util_est(p), uclamp_min, uclamp_max);
}
#else
-static inline unsigned long uclamp_task_util(struct task_struct *p)
+static inline unsigned long uclamp_task_util(struct task_struct *p,
+ unsigned long uclamp_min,
+ unsigned long uclamp_max)
{
return task_util_est(p);
}
@@ -4089,9 +4091,135 @@
trace_sched_util_est_se_tp(&p->se);
}
-static inline int task_fits_capacity(struct task_struct *p, long capacity)
+static inline int util_fits_cpu(unsigned long util,
+ unsigned long uclamp_min,
+ unsigned long uclamp_max,
+ int cpu)
{
- return fits_capacity(uclamp_task_util(p), capacity);
+ unsigned long capacity_orig, capacity_orig_thermal;
+ unsigned long capacity = capacity_of(cpu);
+ bool fits, uclamp_max_fits;
+
+ /*
+ * Check if the real util fits without any uclamp boost/cap applied.
+ */
+ fits = fits_capacity(util, capacity);
+
+ if (!uclamp_is_used())
+ return fits;
+
+ /*
+ * We must use capacity_orig_of() for comparing against uclamp_min and
+ * uclamp_max. We only care about capacity pressure (by using
+ * capacity_of()) for comparing against the real util.
+ *
+ * If a task is boosted to 1024 for example, we don't want a tiny
+ * pressure to skew the check whether it fits a CPU or not.
+ *
+ * Similarly if a task is capped to capacity_orig_of(little_cpu), it
+ * should fit a little cpu even if there's some pressure.
+ *
+ * Only exception is for thermal pressure since it has a direct impact
+ * on available OPP of the system.
+ *
+ * We honour it for uclamp_min only as a drop in performance level
+ * could result in not getting the requested minimum performance level.
+ *
+ * For uclamp_max, we can tolerate a drop in performance level as the
+ * goal is to cap the task. So it's okay if it's getting less.
+ *
+ * In case of capacity inversion, which is not handled yet, we should
+ * honour the inverted capacity for both uclamp_min and uclamp_max all
+ * the time.
+ */
+ capacity_orig = capacity_orig_of(cpu);
+ capacity_orig_thermal = capacity_orig - arch_scale_thermal_pressure(cpu);
+
+ /*
+ * We want to force a task to fit a cpu as implied by uclamp_max.
+ * But we do have some corner cases to cater for..
+ *
+ *
+ * C=z
+ * | ___
+ * | C=y | |
+ * |_ _ _ _ _ _ _ _ _ ___ _ _ _ | _ | _ _ _ _ _ uclamp_max
+ * | C=x | | | |
+ * | ___ | | | |
+ * | | | | | | | (util somewhere in this region)
+ * | | | | | | |
+ * | | | | | | |
+ * +----------------------------------------
+ * cpu0 cpu1 cpu2
+ *
+ * In the above example if a task is capped to a specific performance
+ * point, y, then when:
+ *
+ * * util = 80% of x then it does not fit on cpu0 and should migrate
+ * to cpu1
+ * * util = 80% of y then it is forced to fit on cpu1 to honour
+ * uclamp_max request.
+ *
+ * which is what we're enforcing here. A task always fits if
+ * uclamp_max <= capacity_orig. But when uclamp_max > capacity_orig,
+ * the normal upmigration rules should withhold still.
+ *
+ * Only exception is when we are on max capacity, then we need to be
+ * careful not to block overutilized state. This is so because:
+ *
+ * 1. There's no concept of capping at max_capacity! We can't go
+ * beyond this performance level anyway.
+ * 2. The system is being saturated when we're operating near
+ * max capacity, it doesn't make sense to block overutilized.
+ */
+ uclamp_max_fits = (capacity_orig == SCHED_CAPACITY_SCALE) && (uclamp_max == SCHED_CAPACITY_SCALE);
+ uclamp_max_fits = !uclamp_max_fits && (uclamp_max <= capacity_orig);
+ fits = fits || uclamp_max_fits;
+
+ /*
+ *
+ * C=z
+ * | ___ (region a, capped, util >= uclamp_max)
+ * | C=y | |
+ * |_ _ _ _ _ _ _ _ _ ___ _ _ _ | _ | _ _ _ _ _ uclamp_max
+ * | C=x | | | |
+ * | ___ | | | | (region b, uclamp_min <= util <= uclamp_max)
+ * |_ _ _|_ _|_ _ _ _| _ | _ _ _| _ | _ _ _ _ _ uclamp_min
+ * | | | | | | |
+ * | | | | | | | (region c, boosted, util < uclamp_min)
+ * +----------------------------------------
+ * cpu0 cpu1 cpu2
+ *
+ * a) If util > uclamp_max, then we're capped, we don't care about
+ * actual fitness value here. We only care if uclamp_max fits
+ * capacity without taking margin/pressure into account.
+ * See comment above.
+ *
+ * b) If uclamp_min <= util <= uclamp_max, then the normal
+ * fits_capacity() rules apply. Except we need to ensure that we
+ * enforce we remain within uclamp_max, see comment above.
+ *
+ * c) If util < uclamp_min, then we are boosted. Same as (b) but we
+ * need to take into account the boosted value fits the CPU without
+ * taking margin/pressure into account.
+ *
+ * Cases (a) and (b) are handled in the 'fits' variable already. We
+ * just need to consider an extra check for case (c) after ensuring we
+ * handle the case uclamp_min > uclamp_max.
+ */
+ uclamp_min = min(uclamp_min, uclamp_max);
+ if (util < uclamp_min && capacity_orig != SCHED_CAPACITY_SCALE)
+ fits = fits && (uclamp_min <= capacity_orig_thermal);
+
+ return fits;
+}
+
+static inline int task_fits_cpu(struct task_struct *p, int cpu)
+{
+ unsigned long uclamp_min = uclamp_eff_value(p, UCLAMP_MIN);
+ unsigned long uclamp_max = uclamp_eff_value(p, UCLAMP_MAX);
+ unsigned long util = task_util_est(p);
+ return util_fits_cpu(util, uclamp_min, uclamp_max, cpu);
}
static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
@@ -4107,7 +4235,7 @@
return;
}
- if (task_fits_capacity(p, capacity_of(cpu_of(rq)))) {
+ if (task_fits_cpu(p, cpu_of(rq))) {
rq->misfit_task_load = 0;
return;
}
@@ -4168,6 +4296,29 @@
#endif
}
+static inline bool entity_is_long_sleeper(struct sched_entity *se)
+{
+ struct cfs_rq *cfs_rq;
+ u64 sleep_time;
+
+ if (se->exec_start == 0)
+ return false;
+
+ cfs_rq = cfs_rq_of(se);
+
+ sleep_time = rq_clock_task(rq_of(cfs_rq));
+
+ /* Happen while migrating because of clock task divergence */
+ if (sleep_time <= se->exec_start)
+ return false;
+
+ sleep_time -= se->exec_start;
+ if (sleep_time > ((1ULL << 63) / scale_load_down(NICE_0_LOAD)))
+ return true;
+
+ return false;
+}
+
static void
place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
{
@@ -4196,8 +4347,29 @@
vruntime -= thresh;
}
- /* ensure we never gain time by being placed backwards. */
- se->vruntime = max_vruntime(se->vruntime, vruntime);
+ /*
+ * Pull vruntime of the entity being placed to the base level of
+ * cfs_rq, to prevent boosting it if placed backwards.
+ * However, min_vruntime can advance much faster than real time, with
+ * the extreme being when an entity with the minimal weight always runs
+ * on the cfs_rq. If the waking entity slept for a long time, its
+ * vruntime difference from min_vruntime may overflow s64 and their
+ * comparison may get inversed, so ignore the entity's original
+ * vruntime in that case.
+ * The maximal vruntime speedup is given by the ratio of normal to
+ * minimal weight: scale_load_down(NICE_0_LOAD) / MIN_SHARES.
+ * When placing a migrated waking entity, its exec_start has been set
+ * from a different rq. In order to take into account a possible
+ * divergence between new and prev rq's clocks task because of irq and
+ * stolen time, we take an additional margin.
+ * So, cutting off on the sleep time of
+ * 2^63 / scale_load_down(NICE_0_LOAD) ~ 104 days
+ * should be safe.
+ */
+ if (entity_is_long_sleeper(se))
+ se->vruntime = vruntime;
+ else
+ se->vruntime = max_vruntime(se->vruntime, vruntime);
trace_android_rvh_place_entity(cfs_rq, se, initial, vruntime);
}
@@ -4294,6 +4466,9 @@
if (flags & ENQUEUE_WAKEUP)
place_entity(cfs_rq, se, 0);
+ /* Entity has migrated, no longer consider this task hot */
+ if (flags & ENQUEUE_MIGRATED)
+ se->exec_start = 0;
check_schedstat_required();
update_stats_enqueue(cfs_rq, se, flags);
@@ -5514,13 +5689,15 @@
static inline bool cpu_overutilized(int cpu)
{
+ unsigned long rq_util_min = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MIN);
+ unsigned long rq_util_max = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MAX);
int overutilized = -1;
trace_android_rvh_cpu_overutilized(cpu, &overutilized);
if (overutilized != -1)
return overutilized;
- return !fits_capacity(cpu_util(cpu), capacity_of(cpu));
+ return !util_fits_cpu(cpu_util(cpu), rq_util_min, rq_util_max, cpu);
}
static inline void update_overutilized_status(struct rq *rq)
@@ -6262,21 +6439,23 @@
static int
select_idle_capacity(struct task_struct *p, struct sched_domain *sd, int target)
{
- unsigned long task_util, best_cap = 0;
+ unsigned long task_util, util_min, util_max, best_cap = 0;
int cpu, best_cpu = -1;
struct cpumask *cpus;
cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
- task_util = uclamp_task_util(p);
+ task_util = task_util_est(p);
+ util_min = uclamp_eff_value(p, UCLAMP_MIN);
+ util_max = uclamp_eff_value(p, UCLAMP_MAX);
for_each_cpu_wrap(cpu, cpus, target) {
unsigned long cpu_cap = capacity_of(cpu);
if (!available_idle_cpu(cpu) && !sched_idle_cpu(cpu))
continue;
- if (fits_capacity(task_util, cpu_cap))
+ if (util_fits_cpu(task_util, util_min, util_max, cpu))
return cpu;
if (cpu_cap > best_cap) {
@@ -6288,10 +6467,13 @@
return best_cpu;
}
-static inline bool asym_fits_capacity(int task_util, int cpu)
+static inline bool asym_fits_cpu(unsigned long util,
+ unsigned long util_min,
+ unsigned long util_max,
+ int cpu)
{
if (static_branch_unlikely(&sched_asym_cpucapacity))
- return fits_capacity(task_util, capacity_of(cpu));
+ return util_fits_cpu(util, util_min, util_max, cpu);
return true;
}
@@ -6302,7 +6484,7 @@
static int select_idle_sibling(struct task_struct *p, int prev, int target)
{
struct sched_domain *sd;
- unsigned long task_util;
+ unsigned long task_util, util_min, util_max;
int i, recent_used_cpu;
/*
@@ -6311,11 +6493,13 @@
*/
if (static_branch_unlikely(&sched_asym_cpucapacity)) {
sync_entity_load_avg(&p->se);
- task_util = uclamp_task_util(p);
+ task_util = task_util_est(p);
+ util_min = uclamp_eff_value(p, UCLAMP_MIN);
+ util_max = uclamp_eff_value(p, UCLAMP_MAX);
}
if ((available_idle_cpu(target) || sched_idle_cpu(target)) &&
- asym_fits_capacity(task_util, target))
+ asym_fits_cpu(task_util, util_min, util_max, target))
return target;
/*
@@ -6323,7 +6507,7 @@
*/
if (prev != target && cpus_share_cache(prev, target) &&
(available_idle_cpu(prev) || sched_idle_cpu(prev)) &&
- asym_fits_capacity(task_util, prev))
+ asym_fits_cpu(task_util, util_min, util_max, prev))
return prev;
/*
@@ -6338,7 +6522,7 @@
in_task() &&
prev == smp_processor_id() &&
this_rq()->nr_running <= 1 &&
- asym_fits_capacity(task_util, prev)) {
+ asym_fits_cpu(task_util, util_min, util_max, prev)) {
return prev;
}
@@ -6349,7 +6533,7 @@
cpus_share_cache(recent_used_cpu, target) &&
(available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) &&
- asym_fits_capacity(task_util, recent_used_cpu)) {
+ asym_fits_cpu(task_util, util_min, util_max, recent_used_cpu)) {
/*
* Replace recent_used_cpu with prev as it is a potential
* candidate for the next wake:
@@ -6682,6 +6866,8 @@
{
unsigned long prev_delta = ULONG_MAX, best_delta = ULONG_MAX;
unsigned long best_delta2 = ULONG_MAX;
+ unsigned long p_util_min = uclamp_is_used() ? uclamp_eff_value(p, UCLAMP_MIN) : 0;
+ unsigned long p_util_max = uclamp_is_used() ? uclamp_eff_value(p, UCLAMP_MAX) : 1024;
struct root_domain *rd = cpu_rq(smp_processor_id())->rd;
int max_spare_cap_cpu_ls = prev_cpu, best_idle_cpu = -1;
unsigned long max_spare_cap_ls = 0, target_cap;
@@ -6707,7 +6893,7 @@
cpu = smp_processor_id();
if (sync && cpu_rq(cpu)->nr_running == 1 &&
cpumask_test_cpu(cpu, p->cpus_ptr) &&
- task_fits_capacity(p, capacity_of(cpu))) {
+ task_fits_cpu(p, cpu)) {
rcu_read_unlock();
return cpu;
}
@@ -6722,7 +6908,7 @@
if (!sd)
goto fail;
- if (!task_util_est(p))
+ if (!uclamp_task_util(p, p_util_min, p_util_max))
goto unlock;
latency_sensitive = uclamp_latency_sensitive(p);
@@ -6731,6 +6917,8 @@
for (; pd; pd = pd->next) {
unsigned long cur_delta, spare_cap, max_spare_cap = 0;
+ unsigned long rq_util_min, rq_util_max;
+ unsigned long util_min, util_max;
unsigned long base_energy_pd;
int max_spare_cap_cpu = -1;
@@ -6754,8 +6942,26 @@
* much capacity we can get out of the CPU; this is
* aligned with schedutil_cpu_util().
*/
- util = uclamp_rq_util_with(cpu_rq(cpu), util, p);
- if (!fits_capacity(util, cpu_cap))
+ if (uclamp_is_used()) {
+ if (uclamp_rq_is_idle(cpu_rq(cpu))) {
+ util_min = p_util_min;
+ util_max = p_util_max;
+ } else {
+ /*
+ * Open code uclamp_rq_util_with() except for
+ * the clamp() part. Ie: apply max aggregation
+ * only. util_fits_cpu() logic requires to
+ * operate on non clamped util but must use the
+ * max-aggregated uclamp_{min, max}.
+ */
+ rq_util_min = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MIN);
+ rq_util_max = uclamp_rq_get(cpu_rq(cpu), UCLAMP_MAX);
+
+ util_min = max(rq_util_min, p_util_min);
+ util_max = max(rq_util_max, p_util_max);
+ }
+ }
+ if (!util_fits_cpu(util, util_min, util_max, cpu))
continue;
/* Always use prev_cpu as a candidate. */
@@ -7034,9 +7240,6 @@
/* Tell new CPU we are migrated */
p->se.avg.last_update_time = 0;
-
- /* We have migrated, no longer consider this task hot */
- p->se.exec_start = 0;
update_scan_period(p, new_cpu);
}
@@ -7983,7 +8186,7 @@
case migrate_misfit:
/* This is not a misfit task */
- if (task_fits_capacity(p, capacity_of(env->src_cpu)))
+ if (task_fits_cpu(p, env->src_cpu))
goto next;
env->imbalance = 0;
@@ -8926,6 +9129,10 @@
memset(sgs, 0, sizeof(*sgs));
+ /* Assume that task can't fit any CPU of the group */
+ if (sd->flags & SD_ASYM_CPUCAPACITY)
+ sgs->group_misfit_task_load = 1;
+
for_each_cpu(i, sched_group_span(group)) {
struct rq *rq = cpu_rq(i);
unsigned int local;
@@ -8945,12 +9152,12 @@
if (!nr_running && idle_cpu_without(i, p))
sgs->idle_cpus++;
- }
+ /* Check if task fits in the CPU */
+ if (sd->flags & SD_ASYM_CPUCAPACITY &&
+ sgs->group_misfit_task_load &&
+ task_fits_cpu(p, i))
+ sgs->group_misfit_task_load = 0;
- /* Check if task fits in the group */
- if (sd->flags & SD_ASYM_CPUCAPACITY &&
- !task_fits_capacity(p, group->sgc->max_capacity)) {
- sgs->group_misfit_task_load = 1;
}
sgs->group_capacity = group->sgc->capacity;
@@ -9395,8 +9602,6 @@
local->avg_load = (local->group_load * SCHED_CAPACITY_SCALE) /
local->group_capacity;
- sds->avg_load = (sds->total_load * SCHED_CAPACITY_SCALE) /
- sds->total_capacity;
/*
* If the local group is more loaded than the selected
* busiest group don't try to pull any tasks.
@@ -9405,6 +9610,19 @@
env->imbalance = 0;
return;
}
+
+ sds->avg_load = (sds->total_load * SCHED_CAPACITY_SCALE) /
+ sds->total_capacity;
+
+ /*
+ * If the local group is more loaded than the average system
+ * load, don't try to pull any tasks.
+ */
+ if (local->avg_load >= sds->avg_load) {
+ env->imbalance = 0;
+ return;
+ }
+
}
/*
@@ -9837,7 +10055,7 @@
.sd = sd,
.dst_cpu = this_cpu,
.dst_rq = this_rq,
- .dst_grpmask = sched_group_span(sd->groups),
+ .dst_grpmask = group_balance_mask(sd->groups),
.idle = idle,
.loop_break = sched_nr_migrate_break,
.cpus = cpus,
--
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