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Message-Id: <20250418032603.61803-2-jameshongleiwang@126.com>
Date: Fri, 18 Apr 2025 11:26:02 +0800
From: Honglei Wang <jameshongleiwang@....com>
To: tj@...nel.org,
void@...ifault.com,
arighi@...dia.com,
changwoo@...lia.com
Cc: mingo@...hat.com,
peterz@...radead.org,
juri.lelli@...hat.com,
vincent.guittot@...aro.org,
dietmar.eggemann@....com,
rostedt@...dmis.org,
bsegall@...gle.com,
mgorman@...e.de,
vschneid@...hat.com,
joshdon@...gle.com,
brho@...gle.com,
linux-kernel@...r.kernel.org,
bpf@...r.kernel.org,
jameshongleiwang@....com
Subject: [PATCH v2 1/2] sched_ext: change the variable name for slice refill event
SCX_EV_ENQ_SLICE_DFL gives the impression that the event only occurs
when the tasks were enqueued, which seems not accurate. What it actually
means is the refilling with defalt slice, and this can occur either when
enqueue or pick_task. Let's change the variable to
SCX_EV_REFILL_SLICE_DFL.
Signed-off-by: Honglei Wang <jameshongleiwang@....com>
---
v2:
- refine the comments base on Andrea's suggestion.
---
kernel/sched/ext.c | 22 +++++++++++-----------
tools/sched_ext/scx_qmap.bpf.c | 4 ++--
2 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 66bcd40a28ca..2a091ea23328 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1517,10 +1517,10 @@ struct scx_event_stats {
s64 SCX_EV_ENQ_SKIP_MIGRATION_DISABLED;
/*
- * The total number of tasks enqueued (or pick_task-ed) with a
- * default time slice (SCX_SLICE_DFL).
+ * Total number of times a task's time slice was refilled with the
+ * default value (SCX_SLICE_DFL).
*/
- s64 SCX_EV_ENQ_SLICE_DFL;
+ s64 SCX_EV_REFILL_SLICE_DFL;
/*
* The total duration of bypass modes in nanoseconds.
@@ -2197,7 +2197,7 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
*/
touch_core_sched(rq, p);
p->scx.slice = SCX_SLICE_DFL;
- __scx_add_event(SCX_EV_ENQ_SLICE_DFL, 1);
+ __scx_add_event(SCX_EV_REFILL_SLICE_DFL, 1);
local_norefill:
dispatch_enqueue(&rq->scx.local_dsq, p, enq_flags);
return;
@@ -2205,7 +2205,7 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
global:
touch_core_sched(rq, p); /* see the comment in local: */
p->scx.slice = SCX_SLICE_DFL;
- __scx_add_event(SCX_EV_ENQ_SLICE_DFL, 1);
+ __scx_add_event(SCX_EV_REFILL_SLICE_DFL, 1);
dispatch_enqueue(find_global_dsq(p), p, enq_flags);
}
@@ -3296,7 +3296,7 @@ static struct task_struct *pick_task_scx(struct rq *rq)
p = prev;
if (!p->scx.slice) {
p->scx.slice = SCX_SLICE_DFL;
- __scx_add_event(SCX_EV_ENQ_SLICE_DFL, 1);
+ __scx_add_event(SCX_EV_REFILL_SLICE_DFL, 1);
}
} else {
p = first_local_task(rq);
@@ -3313,7 +3313,7 @@ static struct task_struct *pick_task_scx(struct rq *rq)
scx_warned_zero_slice = true;
}
p->scx.slice = SCX_SLICE_DFL;
- __scx_add_event(SCX_EV_ENQ_SLICE_DFL, 1);
+ __scx_add_event(SCX_EV_REFILL_SLICE_DFL, 1);
}
}
@@ -3399,7 +3399,7 @@ static int select_task_rq_scx(struct task_struct *p, int prev_cpu, int wake_flag
if (cpu >= 0) {
p->scx.slice = SCX_SLICE_DFL;
p->scx.ddsp_dsq_id = SCX_DSQ_LOCAL;
- __scx_add_event(SCX_EV_ENQ_SLICE_DFL, 1);
+ __scx_add_event(SCX_EV_REFILL_SLICE_DFL, 1);
} else {
cpu = prev_cpu;
}
@@ -4413,7 +4413,7 @@ static ssize_t scx_attr_events_show(struct kobject *kobj,
at += scx_attr_event_show(buf, at, &events, SCX_EV_DISPATCH_KEEP_LAST);
at += scx_attr_event_show(buf, at, &events, SCX_EV_ENQ_SKIP_EXITING);
at += scx_attr_event_show(buf, at, &events, SCX_EV_ENQ_SKIP_MIGRATION_DISABLED);
- at += scx_attr_event_show(buf, at, &events, SCX_EV_ENQ_SLICE_DFL);
+ at += scx_attr_event_show(buf, at, &events, SCX_EV_REFILL_SLICE_DFL);
at += scx_attr_event_show(buf, at, &events, SCX_EV_BYPASS_DURATION);
at += scx_attr_event_show(buf, at, &events, SCX_EV_BYPASS_DISPATCH);
at += scx_attr_event_show(buf, at, &events, SCX_EV_BYPASS_ACTIVATE);
@@ -5148,7 +5148,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
scx_dump_event(s, &events, SCX_EV_DISPATCH_KEEP_LAST);
scx_dump_event(s, &events, SCX_EV_ENQ_SKIP_EXITING);
scx_dump_event(s, &events, SCX_EV_ENQ_SKIP_MIGRATION_DISABLED);
- scx_dump_event(s, &events, SCX_EV_ENQ_SLICE_DFL);
+ scx_dump_event(s, &events, SCX_EV_REFILL_SLICE_DFL);
scx_dump_event(s, &events, SCX_EV_BYPASS_DURATION);
scx_dump_event(s, &events, SCX_EV_BYPASS_DISPATCH);
scx_dump_event(s, &events, SCX_EV_BYPASS_ACTIVATE);
@@ -7313,7 +7313,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_KEEP_LAST);
scx_agg_event(&e_sys, e_cpu, SCX_EV_ENQ_SKIP_EXITING);
scx_agg_event(&e_sys, e_cpu, SCX_EV_ENQ_SKIP_MIGRATION_DISABLED);
- scx_agg_event(&e_sys, e_cpu, SCX_EV_ENQ_SLICE_DFL);
+ scx_agg_event(&e_sys, e_cpu, SCX_EV_REFILL_SLICE_DFL);
scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_DURATION);
scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_DISPATCH);
scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_ACTIVATE);
diff --git a/tools/sched_ext/scx_qmap.bpf.c b/tools/sched_ext/scx_qmap.bpf.c
index 26c40ca4f36c..c3cd9a17d48e 100644
--- a/tools/sched_ext/scx_qmap.bpf.c
+++ b/tools/sched_ext/scx_qmap.bpf.c
@@ -784,8 +784,8 @@ static int monitor_timerfn(void *map, int *key, struct bpf_timer *timer)
scx_read_event(&events, SCX_EV_DISPATCH_KEEP_LAST));
bpf_printk("%35s: %lld", "SCX_EV_ENQ_SKIP_EXITING",
scx_read_event(&events, SCX_EV_ENQ_SKIP_EXITING));
- bpf_printk("%35s: %lld", "SCX_EV_ENQ_SLICE_DFL",
- scx_read_event(&events, SCX_EV_ENQ_SLICE_DFL));
+ bpf_printk("%35s: %lld", "SCX_EV_REFILL_SLICE_DFL",
+ scx_read_event(&events, SCX_EV_REFILL_SLICE_DFL));
bpf_printk("%35s: %lld", "SCX_EV_BYPASS_DURATION",
scx_read_event(&events, SCX_EV_BYPASS_DURATION));
bpf_printk("%35s: %lld", "SCX_EV_BYPASS_DISPATCH",
--
2.45.2
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