hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I7X7WW
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This hook point can change the position of se on the red-black tree, eg: in cloud scenarios, there will be online tasks that need to respond in time and offline tasks that do not need to respond in time. This hook point provides users with a way to customize that Class tasks run first. The basis for pick next task comes from system information, such as the red-black tree, and so on… If the system information of the CFS is modified, it will affect the whole system. Therefore, the hook function is added here. Only the position of the task on the red-black tree is modified, and the value of vruntime is not changed.
Signed-off-by: Guan Jing guanjing6@huawei.com Signed-off-by: Hui Tang tanghui20@huawei.com --- include/linux/sched_hook_defs.h | 2 ++ kernel/sched/fair.c | 9 +++++++++ 2 files changed, 11 insertions(+)
diff --git a/include/linux/sched_hook_defs.h b/include/linux/sched_hook_defs.h index e2f65e4b8895..834e327e481b 100644 --- a/include/linux/sched_hook_defs.h +++ b/include/linux/sched_hook_defs.h @@ -3,3 +3,5 @@ BPF_SCHED_HOOK(int, 0, cfs_check_preempt_tick, struct sched_entity *curr, unsign BPF_SCHED_HOOK(int, 0, cfs_check_preempt_wakeup, struct task_struct *curr, struct task_struct *p) BPF_SCHED_HOOK(int, 0, cfs_wakeup_preempt_entity, struct sched_entity *curr, struct sched_entity *se) +BPF_SCHED_HOOK(int, 0, cfs_tag_pick_next_entity, const struct sched_entity *curr, + const struct sched_entity *next) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c5557449b59e..ecbf5eb0695b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -599,6 +599,15 @@ static inline u64 min_vruntime(u64 min_vruntime, u64 vruntime) static inline bool entity_before(const struct sched_entity *a, const struct sched_entity *b) { +#ifdef CONFIG_BPF_SCHED + if (bpf_sched_enabled()) { + int ret = bpf_sched_cfs_tag_pick_next_entity(a, b); + + if (ret == 1) + return 1; + } +#endif + return (s64)(a->vruntime - b->vruntime) < 0; }