From: Tianchen Ding <dtcccc@linux.alibaba.com> mainline inclusion from mainline-v6.15-rc1 commit 563bc2161b94571ea425bbe2cf69fd38e24cdedf category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/15498 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- When a task is enqueued and its parent cgroup se is already on_rq, this parent cgroup se will not be enqueued again, and hence the root->min_slice leaves unchanged. The same issue happens when a task is dequeued and its parent cgroup se has other runnable entities, and the parent cgroup se will not be dequeued. Force propagating min_slice when se doesn't need to be enqueued or dequeued. Ensure the se hierarchy always get the latest min_slice. Fixes: aef6987d8954 ("sched/eevdf: Propagate min_slice up the cgroup hierarchy") Signed-off-by: Tianchen Ding <dtcccc@linux.alibaba.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20250211063659.7180-1-dtcccc@linux.alibaba.com Conflicts: kernel/sched/fair.c [a trival context conflicts, not merge sched/fair: Add new cfs_rq.h_nr_runnable]] Signed-off-by: Chen Jinghuang <chenjinghuang2@huawei.com> --- kernel/sched/fair.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3bc78ffc27e6..a6a3ee9f6f71 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7737,6 +7737,8 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags) update_cfs_group(se); se->slice = slice; + if (se != cfs_rq->curr) + min_vruntime_cb_propagate(&se->run_node, NULL); slice = cfs_rq_min_slice(cfs_rq); cfs_rq->h_nr_running++; @@ -7853,6 +7855,8 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags) update_cfs_group(se); se->slice = slice; + if (se != cfs_rq->curr) + min_vruntime_cb_propagate(&se->run_node, NULL); slice = cfs_rq_min_slice(cfs_rq); cfs_rq->h_nr_running -= h_nr_running; -- 2.34.1