Re: [PATCH 2/7] sched_ext: Add an event, SCX_EVENT_OFFLINE_LOCAL_DSQ

From: Changwoo Min
Date: Fri Jan 17 2025 - 02:11:34 EST


Hello,

On 25. 1. 17. 10:37, Tejun Heo wrote:
On Fri, Jan 17, 2025 at 12:15:38AM +0900, Changwoo Min wrote:
...
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
index 7e12d5b8322e..8054e4e5ed0c 100644
--- a/kernel/sched/ext.c
+++ b/kernel/sched/ext.c
@@ -1467,6 +1467,12 @@ struct scx_event_stat {
* the core scheduler code silently picks a fallback CPU.
*/
u64 INVAL_SELECT_CPU;
+
+ /*
+ * When dispatching to a local DSQ, the CPU may have gone offline in
+ * the meantime. In this case, the task is bounced to the global DSQ.
+ */
+ u64 OFFLINE_LOCAL_DSQ;

Let's do components in descending order + event:

- SELECT_CPU_INVAL (or SELECT_CPU_FALLBACK)
- DISPATCH_LOCAL_DSQ_OFFLINE

Sure. Will change it in the next version.

Regards,
Changwoo Min