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Message-ID: <ab6f2b5a-57f0-6723-c62f-91a8ce6eddac@arm.com>
Date: Sat, 16 Nov 2019 22:44:40 +0000
From: Valentin Schneider <valentin.schneider@....com>
To: Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Thomas Gleixner <tglx@...utronix.de>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] scheduler fixes
Hi,
On 16/11/2019 21:37, Ingo Molnar wrote:
> Peter Zijlstra (1):
> sched/core: Avoid spurious lock dependencies
>
> Qais Yousef (1):
> sched/uclamp: Fix incorrect condition
>
> Valentin Schneider (2):
> sched/uclamp: Fix overzealous type replacement
This one got a v2 (was missing one location), acked by Vincent:
20191115103908.27610-1-valentin.schneider@....com
> sched/topology, cpuset: Account for housekeeping CPUs to avoid empty cpumasks
And this one is no longer needed, as Michal & I understood (IOW the fix in
rc6 is sufficient), see:
c425c5cb-ba8a-e5f6-d91c-5479779cfb7a@....com
>
> Vincent Guittot (1):
> sched/pelt: Fix update of blocked PELT ordering
>
>
> kernel/cgroup/cpuset.c | 8 +++++++-
> kernel/sched/core.c | 9 +++++----
> kernel/sched/fair.c | 29 ++++++++++++++++++++---------
> kernel/sched/sched.h | 2 +-
> 4 files changed, 33 insertions(+), 15 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index c87ee6412b36..e4c10785dc7c 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -798,8 +798,14 @@ static int generate_sched_domains(cpumask_var_t **domains,
> cpumask_subset(cp->cpus_allowed, top_cpuset.effective_cpus))
> continue;
>
> + /*
> + * Skip cpusets that would lead to an empty sched domain.
> + * That could be because effective_cpus is empty, or because
> + * it's only spanning CPUs outside the housekeeping mask.
> + */
> if (is_sched_load_balance(cp) &&
> - !cpumask_empty(cp->effective_cpus))
> + cpumask_intersects(cp->effective_cpus,
> + housekeeping_cpumask(HK_FLAG_DOMAIN)))
> csa[csn++] = cp;
>
> /* skip @cp's subtree if not a partition root */
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 0f2eb3629070..a4f76d3f5011 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -853,7 +853,7 @@ static inline void uclamp_idle_reset(struct rq *rq, enum uclamp_id clamp_id,
> }
>
> static inline
> -enum uclamp_id uclamp_rq_max_value(struct rq *rq, enum uclamp_id clamp_id,
> +unsigned int uclamp_rq_max_value(struct rq *rq, enum uclamp_id clamp_id,
> unsigned int clamp_value)
> {
> struct uclamp_bucket *bucket = rq->uclamp[clamp_id].bucket;
> @@ -918,7 +918,7 @@ uclamp_eff_get(struct task_struct *p, enum uclamp_id clamp_id)
> return uc_req;
> }
>
> -enum uclamp_id uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
> +unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
> {
> struct uclamp_se uc_eff;
>
> @@ -1065,7 +1065,7 @@ uclamp_update_active(struct task_struct *p, enum uclamp_id clamp_id)
> * affecting a valid clamp bucket, the next time it's enqueued,
> * it will already see the updated clamp bucket value.
> */
> - if (!p->uclamp[clamp_id].active) {
> + if (p->uclamp[clamp_id].active) {
> uclamp_rq_dec_id(rq, p, clamp_id);
> uclamp_rq_inc_id(rq, p, clamp_id);
> }
> @@ -6019,10 +6019,11 @@ void init_idle(struct task_struct *idle, int cpu)
> struct rq *rq = cpu_rq(cpu);
> unsigned long flags;
>
> + __sched_fork(0, idle);
> +
> raw_spin_lock_irqsave(&idle->pi_lock, flags);
> raw_spin_lock(&rq->lock);
>
> - __sched_fork(0, idle);
> idle->state = TASK_RUNNING;
> idle->se.exec_start = sched_clock();
> idle->flags |= PF_IDLE;
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 22a2fed29054..69a81a5709ff 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -7547,6 +7547,19 @@ static void update_blocked_averages(int cpu)
> rq_lock_irqsave(rq, &rf);
> update_rq_clock(rq);
>
> + /*
> + * update_cfs_rq_load_avg() can call cpufreq_update_util(). Make sure
> + * that RT, DL and IRQ signals have been updated before updating CFS.
> + */
> + curr_class = rq->curr->sched_class;
> + update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class);
> + update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
> + update_irq_load_avg(rq, 0);
> +
> + /* Don't need periodic decay once load/util_avg are null */
> + if (others_have_blocked(rq))
> + done = false;
> +
> /*
> * Iterates the task_group tree in a bottom up fashion, see
> * list_add_leaf_cfs_rq() for details.
> @@ -7574,14 +7587,6 @@ static void update_blocked_averages(int cpu)
> done = false;
> }
>
> - curr_class = rq->curr->sched_class;
> - update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class);
> - update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
> - update_irq_load_avg(rq, 0);
> - /* Don't need periodic decay once load/util_avg are null */
> - if (others_have_blocked(rq))
> - done = false;
> -
> update_blocked_load_status(rq, !done);
> rq_unlock_irqrestore(rq, &rf);
> }
> @@ -7642,12 +7647,18 @@ static inline void update_blocked_averages(int cpu)
>
> rq_lock_irqsave(rq, &rf);
> update_rq_clock(rq);
> - update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq);
>
> + /*
> + * update_cfs_rq_load_avg() can call cpufreq_update_util(). Make sure
> + * that RT, DL and IRQ signals have been updated before updating CFS.
> + */
> curr_class = rq->curr->sched_class;
> update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class);
> update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
> update_irq_load_avg(rq, 0);
> +
> + update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq);
> +
> update_blocked_load_status(rq, cfs_rq_has_blocked(cfs_rq) || others_have_blocked(rq));
> rq_unlock_irqrestore(rq, &rf);
> }
> diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
> index c8870c5bd7df..49ed949f850c 100644
> --- a/kernel/sched/sched.h
> +++ b/kernel/sched/sched.h
> @@ -2309,7 +2309,7 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
> #endif /* CONFIG_CPU_FREQ */
>
> #ifdef CONFIG_UCLAMP_TASK
> -enum uclamp_id uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
> +unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
>
> static __always_inline
> unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
>
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