sched: fair: Add strict skip buddy support

Skip buddy i.e task called yield() is always skipped and the next entity is selected to run irrespective of the unfairness. Change-Id: Ia9b9fbe46917152b58dc6406c718eb1cfb3b0fb2 Signed-off-by: Maria Yu <aiquny@codeaurora.org>
mylove90 · Jan 24, 2024 · 54cfff6 · 54cfff6
1 parent a87ee54
commit 54cfff6
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diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
@@ -4343,7 +4343,8 @@ pick_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *curr)
  second = curr;
  }
 
- if (second && wakeup_preempt_entity(second, left) < 1)
+ if (second && (sched_feat(STRICT_SKIP_BUDDY) ||
+ wakeup_preempt_entity(second, left) < 1))
  se = second;
  }
 

diff --git a/kernel/sched/features.h b/kernel/sched/features.h
@@ -26,6 +26,12 @@
  */
 #define SCHED_FEAT_LAST_BUDDY 1
 
+/*
+ * skip buddy i.e task called yield() is always skipped and the
+ * next entity is selected to run irrespective of the vruntime
+ */
+#define SCHED_FEAT_STRICT_SKIP_BUDDY 1
+
 /*
  * Consider buddies to be cache hot, decreases the likelyness of a
  * cache buddy being migrated away, increases cache locality.