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Date: Fri, 19 Mar 2021 16:32:53 -0400
From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
To: Nishanth Aravamudan <naravamudan@...italocean.com>,
Julien Desfossez <jdesfossez@...italocean.com>,
Peter Zijlstra <peterz@...radead.org>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Vineeth Pillai <viremana@...ux.microsoft.com>,
Aaron Lu <aaron.lwe@...il.com>,
Aubrey Li <aubrey.intel@...il.com>, tglx@...utronix.de,
linux-kernel@...r.kernel.org
Cc: mingo@...nel.org, torvalds@...ux-foundation.org,
fweisbec@...il.com, keescook@...omium.org,
Phil Auld <pauld@...hat.com>,
Valentin Schneider <valentin.schneider@....com>,
Mel Gorman <mgorman@...hsingularity.net>,
Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
Paolo Bonzini <pbonzini@...hat.com>, joel@...lfernandes.org,
vineeth@...byteword.org, Chen Yu <yu.c.chen@...el.com>,
Christian Brauner <christian.brauner@...ntu.com>,
Agata Gruza <agata.gruza@...el.com>,
Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>,
graf@...zon.com, konrad.wilk@...cle.com, dfaggioli@...e.com,
rostedt@...dmis.org, benbjiang@...cent.com,
Alexandre Chartre <alexandre.chartre@...cle.com>,
James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
Dhaval Giani <dhaval.giani@...cle.com>, chris.hyser@...cle.com,
Josh Don <joshdon@...gle.com>, Hao Luo <haoluo@...gle.com>,
Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH 6/6] sched: Debug bits...
Tested-by: Julien Desfossez <jdesfossez@...italocean.com>
Not-Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
kernel/sched/core.c | 40 +++++++++++++++++++++++++++++++++++++++-
kernel/sched/fair.c | 9 +++++++++
2 files changed, 48 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a62e8ad5ce58..58cca96ba93d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -147,6 +147,10 @@ static inline bool prio_less(struct task_struct *a, struct task_struct *b, bool
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;
@@ -312,12 +316,16 @@ 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)
{
stop_machine(__sched_core_stopper, (void *)false, NULL);
static_branch_disable(&__sched_core_enabled);
+
+ printk("core sched disabled\n");
}
void sched_core_get(void)
@@ -5503,6 +5511,13 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
set_next_task(rq, next);
}
+ trace_printk("pick pre selected (%u %u %u): %s/%d %llu\n",
+ rq->core->core_task_seq,
+ rq->core->core_pick_seq,
+ rq->core_sched_seq,
+ next->comm, next->pid,
+ next->core_cookie.userspace_id);
+
rq->core_pick = NULL;
return next;
}
@@ -5597,6 +5612,10 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
rq->core->core_forceidle_seq++;
}
+ trace_printk("cpu(%d): selected: %s/%d %llu\n",
+ i, p->comm, p->pid,
+ p->core_cookie.userspace_id);
+
/*
* If this new candidate is of higher priority than the
* previous; and they're incompatible; we need to wipe
@@ -5613,6 +5632,10 @@ 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 %llu\n",
+ max->comm, max->pid,
+ max->core_cookie.userspace_id);
+
if (old_max) {
rq->core->core_forceidle = false;
for_each_cpu(j, smt_mask) {
@@ -5634,6 +5657,8 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
/* Something should have been selected for current CPU */
WARN_ON_ONCE(!next);
+ trace_printk("picked: %s/%d %llu\n", next->comm, next->pid,
+ next->core_cookie.userspace_id);
/*
* Reschedule siblings
@@ -5675,13 +5700,21 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
}
/* 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%llu/0x%llu\n",
+ rq_i->cpu, rq_i->core_pick->comm,
+ rq_i->core_pick->pid,
+ rq_i->core_pick->core_cookie.userspace_id,
+ rq_i->core->core_cookie.userspace_id);
+ WARN_ON_ONCE(1);
+ }
if (rq_i->curr == rq_i->core_pick) {
rq_i->core_pick = NULL;
continue;
}
+ trace_printk("IPI(%d)\n", i);
resched_curr(rq_i);
}
@@ -5721,6 +5754,11 @@ 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 %llu\n",
+ p->comm, p->pid, that, this,
+ p->core_occupation, dst->idle->core_occupation,
+ cookie->userspace_id);
+
p->on_rq = TASK_ON_RQ_MIGRATING;
deactivate_task(src, p, 0);
set_task_cpu(p, this);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fddd7c44bbf3..ebeeebc4223a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -10769,6 +10769,15 @@ static void se_fi_update(struct sched_entity *se, unsigned int fi_seq, bool forc
cfs_rq->forceidle_seq = fi_seq;
}
+
+ if (root) {
+ old = cfs_rq->min_vruntime_fi;
+ new = cfs_rq->min_vruntime;
+ root = false;
+ trace_printk("cfs_rq(min_vruntime_fi) %lu->%lu\n",
+ old, new);
+ }
+
cfs_rq->min_vruntime_fi = cfs_rq->min_vruntime;
}
}
--
2.31.0.rc2.261.g7f71774620-goog
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