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From: Peter Oskolkov <posk@posk.io>
To: Vineeth Remanan Pillai <vpillai@digitalocean.com>
Cc: Nishanth Aravamudan <naravamudan@digitalocean.com>,
	Julien Desfossez <jdesfossez@digitalocean.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Tim Chen <tim.c.chen@linux.intel.com>,
	mingo@kernel.org, tglx@linutronix.de, pjt@google.com,
	torvalds@linux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	subhra.mazumdar@oracle.com, fweisbec@gmail.com,
	keescook@chromium.org, kerrnel@google.com,
	Phil Auld <pauld@redhat.com>, Aaron Lu <aaron.lwe@gmail.com>,
	Aubrey Li <aubrey.intel@gmail.com>,
	Valentin Schneider <valentin.schneider@arm.com>,
	Mel Gorman <mgorman@techsingularity.net>,
	Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [RFC PATCH v3 16/16] sched: Debug bits...
Date: Wed, 29 May 2019 14:02:30 -0700	[thread overview]
Message-ID: <CAFTs51V+z-zjGaMAysdR4pPPKJO4rWVekjzRk3mc+wMwwYbvDg@mail.gmail.com> (raw)
In-Reply-To: <c1fd166d42ded9cc9839eb2722174549059dd36f.1559129225.git.vpillai@digitalocean.com>

On Wed, May 29, 2019 at 1:37 PM Vineeth Remanan Pillai
<vpillai@digitalocean.com> wrote:
>
> From: Peter Zijlstra <peterz@infradead.org>
>
> Not-Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

No commit message, not-signed-off-by...

> ---
>  kernel/sched/core.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 5b8223c9a723..90655c9ad937 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -92,6 +92,10 @@ static inline bool prio_less(struct task_struct *a, struct task_struct *b)
>
>         int pa = __task_prio(a), pb = __task_prio(b);
>
> +       trace_printk("(%s/%d;%d,%Lu,%Lu) ?< (%s/%d;%d,%Lu,%Lu)\n",
> +                    a->comm, a->pid, pa, a->se.vruntime, a->dl.deadline,
> +                    b->comm, b->pid, pb, b->se.vruntime, b->dl.deadline);
> +
>         if (-pa < -pb)
>                 return true;
>
> @@ -246,6 +250,8 @@ static void __sched_core_enable(void)
>
>         static_branch_enable(&__sched_core_enabled);
>         stop_machine(__sched_core_stopper, (void *)true, NULL);
> +
> +       printk("core sched enabled\n");
>  }
>
>  static void __sched_core_disable(void)
> @@ -254,6 +260,8 @@ static void __sched_core_disable(void)
>
>         stop_machine(__sched_core_stopper, (void *)false, NULL);
>         static_branch_disable(&__sched_core_enabled);
> +
> +       printk("core sched disabled\n");
>  }
>
>  void sched_core_get(void)
> @@ -3707,6 +3715,14 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
>                         put_prev_task(rq, prev);
>                         set_next_task(rq, next);
>                 }
> +
> +               trace_printk("pick pre selected (%u %u %u): %s/%d %lx\n",
> +                            rq->core->core_task_seq,
> +                            rq->core->core_pick_seq,
> +                            rq->core_sched_seq,
> +                            next->comm, next->pid,
> +                            next->core_cookie);
> +
>                 return next;
>         }
>
> @@ -3786,6 +3802,9 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
>                          */
>                         if (i == cpu && !need_sync && !p->core_cookie) {
>                                 next = p;
> +                               trace_printk("unconstrained pick: %s/%d %lx\n",
> +                                            next->comm, next->pid, next->core_cookie);
> +
>                                 goto done;
>                         }
>
> @@ -3794,6 +3813,9 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
>
>                         rq_i->core_pick = p;
>
> +                       trace_printk("cpu(%d): selected: %s/%d %lx\n",
> +                                    i, p->comm, p->pid, p->core_cookie);
> +
>                         /*
>                          * If this new candidate is of higher priority than the
>                          * previous; and they're incompatible; we need to wipe
> @@ -3810,6 +3832,8 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
>                                 rq->core->core_cookie = p->core_cookie;
>                                 max = p;
>
> +                               trace_printk("max: %s/%d %lx\n", max->comm, max->pid, max->core_cookie);
> +
>                                 if (old_max) {
>                                         for_each_cpu(j, smt_mask) {
>                                                 if (j == i)
> @@ -3837,6 +3861,7 @@ next_class:;
>         rq->core->core_pick_seq = rq->core->core_task_seq;
>         next = rq->core_pick;
>         rq->core_sched_seq = rq->core->core_pick_seq;
> +       trace_printk("picked: %s/%d %lx\n", next->comm, next->pid, next->core_cookie);
>
>         /*
>          * Reschedule siblings
> @@ -3862,11 +3887,20 @@ next_class:;
>                 if (i == cpu)
>                         continue;
>
> -               if (rq_i->curr != rq_i->core_pick)
> +               if (rq_i->curr != rq_i->core_pick) {
> +                       trace_printk("IPI(%d)\n", i);
>                         resched_curr(rq_i);
> +               }
>
>                 /* Did we break L1TF mitigation requirements? */
> -               WARN_ON_ONCE(!cookie_match(next, rq_i->core_pick));
> +               if (unlikely(!cookie_match(next, rq_i->core_pick))) {
> +                       trace_printk("[%d]: cookie mismatch. %s/%d/0x%lx/0x%lx\n",
> +                                    rq_i->cpu, rq_i->core_pick->comm,
> +                                    rq_i->core_pick->pid,
> +                                    rq_i->core_pick->core_cookie,
> +                                    rq_i->core->core_cookie);
> +                       WARN_ON_ONCE(1);
> +               }
>         }
>
>  done:
> @@ -3905,6 +3939,10 @@ static bool try_steal_cookie(int this, int that)
>                 if (p->core_occupation > dst->idle->core_occupation)
>                         goto next;
>
> +               trace_printk("core fill: %s/%d (%d->%d) %d %d %lx\n",
> +                            p->comm, p->pid, that, this,
> +                            p->core_occupation, dst->idle->core_occupation, cookie);
> +
>                 p->on_rq = TASK_ON_RQ_MIGRATING;
>                 deactivate_task(src, p, 0);
>                 set_task_cpu(p, this);
> @@ -6501,6 +6539,8 @@ int sched_cpu_starting(unsigned int cpu)
>                 WARN_ON_ONCE(rq->core && rq->core != core_rq);
>                 rq->core = core_rq;
>         }
> +
> +       printk("core: %d -> %d\n", cpu, cpu_of(core_rq));
>  #endif /* CONFIG_SCHED_CORE */
>
>         sched_rq_cpu_starting(cpu);
> --
> 2.17.1
>

  reply	other threads:[~2019-05-29 21:02 UTC|newest]

Thread overview: 161+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-29 20:36 [RFC PATCH v3 00/16] Core scheduling v3 Vineeth Remanan Pillai
2019-05-29 20:36 ` [RFC PATCH v3 01/16] stop_machine: Fix stop_cpus_in_progress ordering Vineeth Remanan Pillai
2019-08-08 10:54   ` [tip:sched/core] " tip-bot for Peter Zijlstra
2019-08-26 16:19   ` [RFC PATCH v3 01/16] " mark gross
2019-08-26 16:59     ` Peter Zijlstra
2019-05-29 20:36 ` [RFC PATCH v3 02/16] sched: Fix kerneldoc comment for ia64_set_curr_task Vineeth Remanan Pillai
2019-08-08 10:55   ` [tip:sched/core] " tip-bot for Peter Zijlstra
2019-08-26 16:20   ` [RFC PATCH v3 02/16] " mark gross
2019-05-29 20:36 ` [RFC PATCH v3 03/16] sched: Wrap rq::lock access Vineeth Remanan Pillai
2019-05-29 20:36 ` [RFC PATCH v3 04/16] sched/{rt,deadline}: Fix set_next_task vs pick_next_task Vineeth Remanan Pillai
2019-08-08 10:55   ` [tip:sched/core] " tip-bot for Peter Zijlstra
2019-05-29 20:36 ` [RFC PATCH v3 05/16] sched: Add task_struct pointer to sched_class::set_curr_task Vineeth Remanan Pillai
2019-08-08 10:57   ` [tip:sched/core] " tip-bot for Peter Zijlstra
2019-05-29 20:36 ` [RFC PATCH v3 06/16] sched/fair: Export newidle_balance() Vineeth Remanan Pillai
2019-08-08 10:58   ` [tip:sched/core] sched/fair: Expose newidle_balance() tip-bot for Peter Zijlstra
2019-05-29 20:36 ` [RFC PATCH v3 07/16] sched: Allow put_prev_task() to drop rq->lock Vineeth Remanan Pillai
2019-08-08 10:58   ` [tip:sched/core] " tip-bot for Peter Zijlstra
2019-08-26 16:51   ` [RFC PATCH v3 07/16] " mark gross
2019-05-29 20:36 ` [RFC PATCH v3 08/16] sched: Rework pick_next_task() slow-path Vineeth Remanan Pillai
2019-08-08 10:59   ` [tip:sched/core] " tip-bot for Peter Zijlstra
2019-08-26 17:01   ` [RFC PATCH v3 08/16] " mark gross
2019-05-29 20:36 ` [RFC PATCH v3 09/16] sched: Introduce sched_class::pick_task() Vineeth Remanan Pillai
2019-08-26 17:14   ` mark gross
2019-05-29 20:36 ` [RFC PATCH v3 10/16] sched: Core-wide rq->lock Vineeth Remanan Pillai
2019-05-31 11:08   ` Peter Zijlstra
2019-05-31 15:23     ` Vineeth Pillai
2019-05-29 20:36 ` [RFC PATCH v3 11/16] sched: Basic tracking of matching tasks Vineeth Remanan Pillai
2019-08-26 20:59   ` mark gross
2019-05-29 20:36 ` [RFC PATCH v3 12/16] sched: A quick and dirty cgroup tagging interface Vineeth Remanan Pillai
2019-05-29 20:36 ` [RFC PATCH v3 13/16] sched: Add core wide task selection and scheduling Vineeth Remanan Pillai
2019-06-07 23:36   ` Pawan Gupta
2019-05-29 20:36 ` [RFC PATCH v3 14/16] sched/fair: Add a few assertions Vineeth Remanan Pillai
2019-05-29 20:36 ` [RFC PATCH v3 15/16] sched: Trivial forced-newidle balancer Vineeth Remanan Pillai
2019-05-29 20:36 ` [RFC PATCH v3 16/16] sched: Debug bits Vineeth Remanan Pillai
2019-05-29 21:02   ` Peter Oskolkov [this message]
2019-05-30 14:04 ` [RFC PATCH v3 00/16] Core scheduling v3 Aubrey Li
2019-05-30 14:17   ` Julien Desfossez
2019-05-31  4:55     ` Aubrey Li
2019-05-31  3:01   ` Aaron Lu
2019-05-31  5:12     ` Aubrey Li
2019-05-31  6:09       ` Aaron Lu
2019-05-31  6:53         ` Aubrey Li
2019-05-31  7:44           ` Aaron Lu
2019-05-31  8:26             ` Aubrey Li
2019-05-31 21:08     ` Julien Desfossez
2019-06-06 15:26       ` Julien Desfossez
2019-06-12  1:52         ` Li, Aubrey
2019-06-12 16:06           ` Julien Desfossez
2019-06-12 16:33         ` Julien Desfossez
2019-06-13  0:03           ` Subhra Mazumdar
2019-06-13  3:22             ` Julien Desfossez
2019-06-17  2:51               ` Aubrey Li
2019-06-19 18:33                 ` Julien Desfossez
2019-07-18 10:07                   ` Aaron Lu
2019-07-18 23:27                     ` Tim Chen
2019-07-19  5:52                       ` Aaron Lu
2019-07-19 11:48                         ` Aubrey Li
2019-07-19 18:33                         ` Tim Chen
2019-07-22 10:26                     ` Aubrey Li
2019-07-22 10:43                       ` Aaron Lu
2019-07-23  2:52                         ` Aubrey Li
2019-07-25 14:30                       ` Aaron Lu
2019-07-25 14:31                         ` [RFC PATCH 1/3] wrapper for cfs_rq->min_vruntime Aaron Lu
2019-07-25 14:32                         ` [PATCH 2/3] core vruntime comparison Aaron Lu
2019-08-06 14:17                           ` Peter Zijlstra
2019-07-25 14:33                         ` [PATCH 3/3] temp hack to make tick based schedule happen Aaron Lu
2019-07-25 21:42                         ` [RFC PATCH v3 00/16] Core scheduling v3 Li, Aubrey
2019-07-26 15:21                         ` Julien Desfossez
2019-07-26 21:29                           ` Tim Chen
2019-07-31  2:42                           ` Li, Aubrey
2019-08-02 15:37                             ` Julien Desfossez
2019-08-05 15:55                               ` Tim Chen
2019-08-06  3:24                                 ` Aaron Lu
2019-08-06  6:56                                   ` Aubrey Li
2019-08-06  7:04                                     ` Aaron Lu
2019-08-06 12:24                                       ` Vineeth Remanan Pillai
2019-08-06 13:49                                         ` Aaron Lu
2019-08-06 16:14                                           ` Vineeth Remanan Pillai
2019-08-06 14:16                                         ` Peter Zijlstra
2019-08-06 15:53                                           ` Vineeth Remanan Pillai
2019-08-06 17:03                                   ` Tim Chen
2019-08-06 17:12                                     ` Peter Zijlstra
2019-08-06 21:19                                       ` Tim Chen
2019-08-08  6:47                                         ` Aaron Lu
2019-08-08 17:27                                           ` Tim Chen
2019-08-08 21:42                                             ` Tim Chen
2019-08-10 14:15                                               ` Aaron Lu
2019-08-12 15:38                                                 ` Vineeth Remanan Pillai
2019-08-13  2:24                                                   ` Aaron Lu
2019-08-08 12:55                                 ` Aaron Lu
2019-08-08 16:39                                   ` Tim Chen
2019-08-10 14:18                                     ` Aaron Lu
2019-08-05 20:09                               ` Phil Auld
2019-08-06 13:54                                 ` Aaron Lu
2019-08-06 14:17                                   ` Phil Auld
2019-08-06 14:41                                     ` Aaron Lu
2019-08-06 14:55                                       ` Phil Auld
2019-08-07  8:58                               ` Dario Faggioli
2019-08-07 17:10                                 ` Tim Chen
2019-08-15 16:09                                   ` Dario Faggioli
2019-08-16  2:33                                     ` Aaron Lu
2019-09-05  1:44                                   ` Julien Desfossez
2019-09-06 22:17                                     ` Tim Chen
2019-09-18 21:27                                     ` Tim Chen
2019-09-06 18:30                                   ` Tim Chen
2019-09-11 14:02                                     ` Aaron Lu
2019-09-11 16:19                                       ` Tim Chen
2019-09-11 16:47                                         ` Vineeth Remanan Pillai
2019-09-12 12:35                                           ` Aaron Lu
2019-09-12 17:29                                             ` Tim Chen
2019-09-13 14:15                                               ` Aaron Lu
2019-09-13 17:13                                                 ` Tim Chen
2019-09-30 11:53                                             ` Vineeth Remanan Pillai
2019-10-02 20:48                                               ` Vineeth Remanan Pillai
2019-10-10 13:54                                                 ` Aaron Lu
2019-10-10 14:29                                                   ` Vineeth Remanan Pillai
2019-10-11  7:33                                                     ` Aaron Lu
2019-10-11 11:32                                                       ` Vineeth Remanan Pillai
2019-10-11 12:01                                                         ` Aaron Lu
2019-10-11 12:10                                                           ` Vineeth Remanan Pillai
2019-10-12  3:55                                                             ` Aaron Lu
2019-10-13 12:44                                                               ` Vineeth Remanan Pillai
2019-10-14  9:57                                                                 ` Aaron Lu
2019-10-21 12:30                                                                   ` Vineeth Remanan Pillai
2019-09-12 12:04                                         ` Aaron Lu
2019-09-12 17:05                                           ` Tim Chen
2019-09-13 13:57                                             ` Aaron Lu
2019-09-12 23:12                                           ` Aubrey Li
2019-09-15 14:14                                             ` Aaron Lu
2019-09-18  1:33                                               ` Aubrey Li
2019-09-18 20:40                                                 ` Tim Chen
2019-09-18 22:16                                                   ` Aubrey Li
2019-09-30 14:36                                                     ` Vineeth Remanan Pillai
2019-10-29 20:40                                                   ` Julien Desfossez
2019-11-01 21:42                                                     ` Tim Chen
2019-10-29  9:11                                               ` Dario Faggioli
2019-10-29  9:15                                                 ` Dario Faggioli
2019-10-29  9:16                                                 ` Dario Faggioli
2019-10-29  9:17                                                 ` Dario Faggioli
2019-10-29  9:18                                                 ` Dario Faggioli
2019-10-29  9:18                                                 ` Dario Faggioli
2019-10-29  9:19                                                 ` Dario Faggioli
2019-10-29  9:20                                                 ` Dario Faggioli
2019-10-29 20:34                                                   ` Julien Desfossez
2019-11-15 16:30                                                     ` Dario Faggioli
2019-09-25  2:40                                     ` Aubrey Li
2019-09-25 17:24                                       ` Tim Chen
2019-09-25 22:07                                         ` Aubrey Li
2019-09-30 15:22                                     ` Julien Desfossez
2019-08-27 21:14 ` Matthew Garrett
2019-08-27 21:50   ` Peter Zijlstra
2019-08-28 15:30     ` Phil Auld
2019-08-28 16:01       ` Peter Zijlstra
2019-08-28 16:37         ` Tim Chen
2019-08-29 14:30         ` Phil Auld
2019-08-29 14:38           ` Peter Zijlstra
2019-09-10 14:27             ` Julien Desfossez
2019-09-18 21:12               ` Tim Chen
2019-08-28 15:59     ` Tim Chen
2019-08-28 16:16       ` Peter Zijlstra
2019-08-27 23:24   ` Aubrey Li

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