anolis: sched: Ensure the logic of check_preempt_tick with CONFIG_GRO…

…UP_IDENTITY off ANBZ: torvalds#471 If we turn CONFIG_GROUP_IDENTITY off, is_highclass() will return false, which will result in that check_preempt_tick() returns immediately, and this is not right. To solved this problem, we just judge whether delta_exec < sysctl_sched_min_granularity if CONFIG_GROUP_IDENTITY is off. Signed-off-by: Peng Wang <[email protected]> Signed-off-by: Cruz Zhao <[email protected]> Signed-off-by: Shile Zhang <[email protected]> Acked-by: Michael Wang <[email protected]>
gatieme · Feb 16, 2022 · baa4bee · baa4bee
1 parent 533d409
commit baa4bee
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
@@ -5546,7 +5546,11 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
 	 * narrow margin doesn't have to wait for a full slice.
 	 * This also mitigates buddy induced latencies under load.
 	 */
+#ifdef CONFIG_GROUP_IDENTITY
 	if (is_highclass(curr) && delta_exec < sysctl_sched_min_granularity)
+#else
+	if (delta_exec < sysctl_sched_min_granularity)
+#endif
 		return;
 
 	/* Must be on expel if no next se, and curr won't be expellee */