diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched/ext.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/sched/ext.h b/include/linux/sched/ext.h index a6db5d300f30..78b2f289cb98 100644 --- a/include/linux/sched/ext.h +++ b/include/linux/sched/ext.h @@ -298,6 +298,19 @@ static inline bool scx_rcu_cpu_stall(const struct cpumask *stalled_mask) { retur struct scx_task_group { #ifdef CONFIG_EXT_GROUP_SCHED + /* + * The sched this tg is on, NULL if none. SCX_TG_INITED tracks whether + * ops.cgroup_init() succeeded on it. When a child sched exits and its + * tgs move to the parent, a failed init leaves the tg on the parent + * with INITED clear (see scx_cgroup_return_subtree()). + * + * This is tracked separately from cgrp->scx_sched because the tg + * hierarchy can diverge from the cgroup2 hierarchy in both lifetime and + * shape. A tg stays online past its cgroup's removal while the + * cgrp->scx_sched rewrites visit only live cgroups, leaving a removed + * cgroup's pointer stale. The cpu controller can also be mounted on + * cgroup1. + */ struct scx_sched *sched; u32 flags; /* SCX_TG_* */ |