diff options
Diffstat (limited to 'kernel/sched/ext/internal.h')
| -rw-r--r-- | kernel/sched/ext/internal.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/kernel/sched/ext/internal.h b/kernel/sched/ext/internal.h index 86f9db116a8e..abbcaab8f35a 100644 --- a/kernel/sched/ext/internal.h +++ b/kernel/sched/ext/internal.h @@ -1155,6 +1155,13 @@ struct scx_event_stats { * it can't be rejected. The violation is counted here. */ s64 SCX_EV_SUB_FORCED_ADMIT; + + /* + * The number of times a preempting kick was refused because the + * sub-sched lacked SCX_CAP_PREEMPT for a task outside its subtree. The + * kick degrades to a plain reschedule. + */ + s64 SCX_EV_SUB_PREEMPT_DENIED; }; #define SCX_EVENTS_LIST(SCX_EVENT) \ @@ -1173,7 +1180,8 @@ struct scx_event_stats { SCX_EVENT(SCX_EV_BYPASS_ACTIVATE); \ SCX_EVENT(SCX_EV_INSERT_NOT_OWNED); \ SCX_EVENT(SCX_EV_SUB_BYPASS_DISPATCH); \ - SCX_EVENT(SCX_EV_SUB_FORCED_ADMIT) + SCX_EVENT(SCX_EV_SUB_FORCED_ADMIT); \ + SCX_EVENT(SCX_EV_SUB_PREEMPT_DENIED) struct scx_sched; @@ -1287,22 +1295,33 @@ struct scx_sched_pnode { * the allocation pattern. * * ENQ_IMMED insert an IMMED task onto the cid's local DSQ + * - kick the cid's cpu (except SCX_KICK_PREEMPT) * * ENQ insert any task onto the cid's local DSQ (implies ENQ_IMMED) * + * PREEMPT preempt any task running on the cid regardless of the owning + * sched (implies ENQ). Preempting a task in the sched's own subtree + * doesn't require any cap. + * - SCX_ENQ_PREEMPT inserts + * - SCX_KICK_PREEMPT kicks + * * Implied caps apply to the holder's own use of a cid, not to delegation. * scx_bpf_sub_grant() delegates literally-held caps, so a cap held only through - * implication is usable but cannot be re-delegated to a child. + * implication is usable but cannot be re-delegated to a child. When granting a + * cap, it usually makes sense to delegate its implied caps explicitly alongside + * it. */ enum scx_cap_flags { __SCX_CAP_ENQ_IMMED = 0, __SCX_CAP_ENQ = 1, + __SCX_CAP_PREEMPT = 2, __SCX_NR_CAPS, __SCX_CAP_ALL = BIT_U64(__SCX_NR_CAPS) - 1, SCX_CAP_ENQ_IMMED = BIT_U64(__SCX_CAP_ENQ_IMMED), SCX_CAP_ENQ = BIT_U64(__SCX_CAP_ENQ), + SCX_CAP_PREEMPT = BIT_U64(__SCX_CAP_PREEMPT), /* alias for minimal cap to make any use of a cpu */ SCX_CAP_BASE = SCX_CAP_ENQ_IMMED, @@ -1914,6 +1933,7 @@ struct scx_sched *scx_alloc_and_add_sched(struct scx_enable_cmd *cmd, struct scx_sched *parent); int scx_validate_ops(struct scx_sched *sch, const struct sched_ext_ops *ops); int scx_sched_sysfs_add(struct scx_sched *sch); +bool scx_is_descendant(struct scx_sched *sch, struct scx_sched *ancestor); extern raw_spinlock_t scx_sched_lock; extern struct mutex scx_enable_mutex; |