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sched_ext: Add SCX_EV_ENQ_SKIP_MIGRATION_DISABLED

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Count the number of times a migration disabled task is automatically
dispatched to its local DSQ.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Changwoo Min <changwoo@igalia.com>
This commit is contained in:
Tejun Heo 2025-02-08 20:39:11 -10:00
parent 26176116d9
commit eace54dff0
1 changed files with 12 additions and 1 deletions
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13
kernel/sched/ext.c
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@ -1483,6 +1483,13 @@ struct scx_event_stats {
*/
u64 SCX_EV_ENQ_SKIP_EXITING;
/*
* If SCX_OPS_ENQ_MIGRATION_DISABLED is not set, the number of times a
* migration disabled task skips ops.enqueue() and is dispatched to its
* local DSQ.
*/
u64 SCX_EV_ENQ_SKIP_MIGRATION_DISABLED;
/*
* The total number of tasks enqueued (or pick_task-ed) with a
* default time slice (SCX_SLICE_DFL).
@ -2119,8 +2126,10 @@ static void do_enqueue_task(struct rq *rq, struct task_struct *p, u64 enq_flags,
/* see %SCX_OPS_ENQ_MIGRATION_DISABLED */
if (!static_branch_unlikely(&scx_ops_enq_migration_disabled) &&
is_migration_disabled(p))
is_migration_disabled(p)) {
__scx_add_event(SCX_EV_ENQ_SKIP_MIGRATION_DISABLED, 1);
goto local;
}
if (!SCX_HAS_OP(enqueue))
goto global;
@ -5067,6 +5076,7 @@ static void scx_dump_state(struct scx_exit_info *ei, size_t dump_len)
scx_dump_event(s, &events, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
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_BYPASS_DURATION);
scx_dump_event(s, &events, SCX_EV_BYPASS_DISPATCH);
@ -7210,6 +7220,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stats *events,
scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE);
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_BYPASS_DURATION);
scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_DISPATCH);