linux-kernel - [PATCH v2] include SCX_OPS_TRACK

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Message-ID: <20250623043220.63793-1-henry.hj@antgroup.com>
Date: Mon, 23 Jun 2025 12:32:19 +0800
From: "Henry Huang" <henry.hj@...group.com>
To: changwoo@...lia.com,
	arighi@...dia.com,
	tj@...nel.org,
	void@...ifault.com
Cc: "谈鉴锋" <henry.tjf@...group.com>,
  "Yan Yan(cailing)" <yanyan.yan@...group.com>,
   <linux-kernel@...r.kernel.org>,
   <sched-ext@...ts.linux.dev>,
  "Henry Huang" <henry.hj@...group.com>
Subject: [PATCH v2] include SCX_OPS_TRACK_MIGRATION

In our environment, we need track task migrations to update per-cpu
map.
Implementing fentry(on enqueue_task_scx & dequeue_task_scx)
is a feasible solution. But there are some limitations:
1. Can't modify p->scx.xxx
2. enqueue_task_scx & dequeue_task_scx can't have some
special compilation optimizations.
3. Has more overhead compared to struct_ops
So we include SCX_OPS_TRACK_MIGRATION to support tracking task
migrations.
If SCX_OPS_TRACK_MIGRATION is set, runnable/quiescent
would be called whether task is doing migration or not.

For v2:
1. if task_on_rq_migrating(p) == true
   set DEQUEUE_MIGRATING to deq_flags in dequeue_task_scx
   set ENQUEUE_MIGRATING to enq_flags in enqueue_task_scx 

Henry Huang (1):
  sched_ext: include SCX_OPS_TRACK_MIGRATION

 kernel/sched/ext.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

-- 
Henry