This is a note to let you know that I've just added the patch titled
sched/uclamp: Make task_fits_capacity() use util_fits_cpu()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sched-uclamp-make-task_fits_capacity-use-util_fits_cpu.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From qyousef@xxxxxxxxxxx Tue Apr 18 16:09:59 2023
From: Qais Yousef <qyousef@xxxxxxxxxxx>
Date: Tue, 18 Apr 2023 15:09:34 +0100
Subject: sched/uclamp: Make task_fits_capacity() use util_fits_cpu()
To: stable@xxxxxxxxxxxxxxx, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Vincent Guittot <vincent.guittot@xxxxxxxxxx>, Dietmar Eggemann <dietmar.eggemann@xxxxxxx>, Qais Yousef <qais.yousef@xxxxxxx>
Message-ID: <20230418140943.90621-2-qyousef@xxxxxxxxxxx>
From: Qais Yousef <qais.yousef@xxxxxxx>
commit b48e16a69792b5dc4a09d6807369d11b2970cc36 upstream.
So that the new uclamp rules in regard to migration margin and capacity
pressure are taken into account correctly.
Fixes: a7008c07a568 ("sched/fair: Make task_fits_capacity() consider uclamp restrictions")
Co-developed-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Signed-off-by: Qais Yousef <qais.yousef@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220804143609.515789-3-qais.yousef@xxxxxxx
(cherry picked from commit b48e16a69792b5dc4a09d6807369d11b2970cc36)
Signed-off-by: Qais Yousef (Google) <qyousef@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/fair.c | 26 ++++++++++++++++----------
kernel/sched/sched.h | 9 +++++++++
2 files changed, 25 insertions(+), 10 deletions(-)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4197,10 +4197,12 @@ static inline int util_fits_cpu(unsigned
return fits;
}
-static inline int task_fits_capacity(struct task_struct *p,
- unsigned long capacity)
+static inline int task_fits_cpu(struct task_struct *p, int cpu)
{
- return fits_capacity(uclamp_task_util(p), capacity);
+ 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)
@@ -4213,7 +4215,7 @@ static inline void update_misfit_status(
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;
}
@@ -7942,7 +7944,7 @@ static int detach_tasks(struct lb_env *e
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;
@@ -8884,6 +8886,10 @@ static inline void update_sg_wakeup_stat
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;
@@ -8903,12 +8909,12 @@ static inline void update_sg_wakeup_stat
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;
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2468,6 +2468,15 @@ static inline bool uclamp_is_used(void)
return static_branch_likely(&sched_uclamp_used);
}
#else /* CONFIG_UCLAMP_TASK */
+static inline unsigned long uclamp_eff_value(struct task_struct *p,
+ enum uclamp_id clamp_id)
+{
+ if (clamp_id == UCLAMP_MIN)
+ return 0;
+
+ return SCHED_CAPACITY_SCALE;
+}
+
static inline
unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
struct task_struct *p)
Patches currently in stable-queue which might be from qyousef@xxxxxxxxxxx are
queue-5.10/sched-fair-detect-capacity-inversion.patch
queue-5.10/sched-uclamp-make-cpu_overutilized-use-util_fits_cpu.patch
queue-5.10/sched-uclamp-make-select_idle_capacity-use-util_fits_cpu.patch
queue-5.10/sched-uclamp-fix-fits_capacity-check-in-feec.patch
queue-5.10/sched-fair-consider-capacity-inversion-in-util_fits_cpu.patch
queue-5.10/sched-fair-fixes-for-capacity-inversion-detection.patch
queue-5.10/sched-uclamp-make-asym_fits_capacity-use-util_fits_cpu.patch
queue-5.10/sched-uclamp-fix-a-uninitialized-variable-warnings.patch
queue-5.10/sched-uclamp-make-task_fits_capacity-use-util_fits_cpu.patch
queue-5.10/sched-uclamp-cater-for-uclamp-in-find_energy_efficient_cpu-s-early-exit-condition.patch
