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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?jtPjcYX+j2Qt5ru3on4MIun/pFdwxOntFTg7+2nrs8NEa7h7lnL/sgLiEb5S?= =?us-ascii?Q?Y1WzdKrFcrwBJZa90PQo4yAMRzj2QKNDwZn82/l9S0THXN/inNp8I+DihA6U?= =?us-ascii?Q?PUimmXz5/DXq/uOZAGHvz65cVnPk/Q2xh9R2HkBmb7LSRjKd83Mv2ED4vHtO?= =?us-ascii?Q?BroeeACCXV8rNCJxCKvxmFccA7/xKimWxPTrvl6m9MBIGopUJ23HZNi+SmW6?= =?us-ascii?Q?tcp49krWZCbCxo5uoZGlu9/Sek3HoUkC+QUS7zwMgzSl8sy0Prsvxrm/Nd1o?= =?us-ascii?Q?4zgX6DkZwWkjqi9GtopPPz7T71YkJiolIgpXq/hSqVwy3P4M/qSstEyNh0wC?= =?us-ascii?Q?hzwAcAaGhZ0Y5aHKgwuFfQwX4yulWL9vGTeJcY7vdgmeJ51bGmD88wOHybek?= =?us-ascii?Q?jXghZBwnHs4HKN7CLyZfb2WUk9bbzI+sUO0TqYj92B9vGCqGVTjV47ehPHBB?= =?us-ascii?Q?7KcA2E3PBnzQjOvj8gmTLNzEe076Av1D5wS9VSp/E580jtbw61x4N0f4d0qg?= =?us-ascii?Q?5UzkY4H/QdfhGQKlGmjVLXej92llYasRD2q5DcbWh0/WHwJSvFArOsS05dl7?= =?us-ascii?Q?5R3jvxRtAm9WGN27pJSjk8c4uEIsYt5lDL93OVjM2ZhltaaknruNi9XGnbHa?= =?us-ascii?Q?86qb28aL75hfyQ3jbSVghdUQt6SyKwOSiCQVx3hRv027K/X5nDkUF7al20cE?= =?us-ascii?Q?PM8YM853lIaprlWEocIzsdwqyv0zXqqaWZOMkl6FW5FiKzwVxM0iI9udaNNx?= =?us-ascii?Q?oU68C65CtoGFxBgFI3xdRCGPYO3IBB+zoHnyL+Mtqaz6Bi9zK5a3NmOEUYNW?= =?us-ascii?Q?d9xUcr6P3VmV6/c0Wgyyn9nhGA6NU//bpYwe3VsI8O3711yH9g7IQkaWWLBH?= =?us-ascii?Q?jn4p0IbcgrgBjfeXfZTeeySAVPfuWuqwF5jufcr2YVy5K1f6SGxyyOWoqntU?= =?us-ascii?Q?CIt+SSC/BP+7fMFlMKLsIOgYhVc+7AJ6Bu6BFDdMdr5ITWPqfG9l2h2KE7WD?= =?us-ascii?Q?IEaiKDdM2J3mu7ZECNDi6BRqU4fNBnngBhBzxddumNJ+mfV8FSWODacVSN7A?= =?us-ascii?Q?TFNpKV60Ky0wScln7vC/bt6zyyHYUAvawyuhKhee8ck6h1iIGSI5O2ZcLSTb?= =?us-ascii?Q?IwfhieNzvQkCbRtqTP+o6qOFwoPVMlFon0+HQxiS2ef1xEuAQoceABz/STJm?= =?us-ascii?Q?4dIAmIlrXa6fiWCrHmmiaPTW92s3Hs0cXjxLxVneEGATUORQnwf/1tk1NmNS?= =?us-ascii?Q?YXvKlMooreI71lgKSNsoltYZ3vICC7V5wMJpaKaczWlBZCxYxiXq44kAwPbA?= =?us-ascii?Q?cRxAzgcTqYMRuDjfNB8g7gYPQF2U5DmUT4hIlh4ofPiYev4ogw/KkpfAOxRJ?= =?us-ascii?Q?zzgiBuFUEzw0o5L5HO4rblYu4xtUiioM5I8z7TSpb5KeLCAtyT+39/oM8JGv?= =?us-ascii?Q?UHv20YBWsQIbYStgf3tTTKEBzYHXQ3NwIyebSAQ7UbHtlKfI/6M4Vp0xg082?= =?us-ascii?Q?b5vewlnbpCpSx4XkcMI/zGTfj6YzoKU8JOUBXvsgvTikYfGzzVMFVUVIwXOj?= =?us-ascii?Q?G4HjWad3FJ233OrIxIoBS+DP/J88p6uqvevssBql?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8ec2ceaf-674d-499b-5dc1-08de0d603ef7 X-MS-Exchange-CrossTenant-AuthSource: LV8PR12MB9620.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2025 09:33:35.9191 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: PHTiA4lJNJcXw9AfrC8u1zI+thB8tNs4yGdZlh8LYBNx5LetPcYrO2rzfpF/HWjWNSuLVdCR+zNvbQXq0LH6Ow== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8689 From: Joel Fernandes sched_ext currently suffers starvation due to RT. The same workload when converted to EXT can get zero runtime if RT is 100% running, causing EXT processes to stall. Fix it by adding a DL server for EXT. A kselftest is also provided later to verify: ./runner -t rt_stall ===== START ===== TEST: rt_stall DESCRIPTION: Verify that RT tasks cannot stall SCHED_EXT tasks OUTPUT: TAP version 13 1..1 ok 1 PASS: CFS task got more than 4.00% of runtime [ arighi: drop ->balance() now that pick_task() has an rf argument ] Cc: Luigi De Matteis Co-developed-by: Andrea Righi Signed-off-by: Andrea Righi Signed-off-by: Joel Fernandes --- kernel/sched/core.c | 3 +++ kernel/sched/deadline.c | 2 +- kernel/sched/ext.c | 51 +++++++++++++++++++++++++++++++++++++++-- kernel/sched/sched.h | 2 ++ 4 files changed, 55 insertions(+), 3 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 096e8d03d85e7..31a9c9381c63f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8679,6 +8679,9 @@ void __init sched_init(void) hrtick_rq_init(rq); atomic_set(&rq->nr_iowait, 0); fair_server_init(rq); +#ifdef CONFIG_SCHED_CLASS_EXT + ext_server_init(rq); +#endif #ifdef CONFIG_SCHED_CORE rq->core = rq; diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 0680e0186577a..3c1fd2190949e 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1504,7 +1504,7 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64 * The fair server (sole dl_server) does not account for real-time * workload because it is running fair work. */ - if (dl_se == &rq->fair_server) + if (dl_se->dl_server) return; #ifdef CONFIG_RT_GROUP_SCHED diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index adff739b396ce..bc2aaa3236fd4 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -881,6 +881,9 @@ static void update_curr_scx(struct rq *rq) if (!curr->scx.slice) touch_core_sched(rq, curr); } + + if (dl_server_active(&rq->ext_server)) + dl_server_update(&rq->ext_server, delta_exec); } static bool scx_dsq_priq_less(struct rb_node *node_a, @@ -1388,6 +1391,15 @@ static void enqueue_task_scx(struct rq *rq, struct task_struct *p, int enq_flags if (enq_flags & SCX_ENQ_WAKEUP) touch_core_sched(rq, p); + if (rq->scx.nr_running == 1) { + /* Account for idle runtime */ + if (!rq->nr_running) + dl_server_update_idle_time(rq, rq->curr, &rq->ext_server); + + /* Start dl_server if this is the first task being enqueued */ + dl_server_start(&rq->ext_server); + } + do_enqueue_task(rq, p, enq_flags, sticky_cpu); out: rq->scx.flags &= ~SCX_RQ_IN_WAKEUP; @@ -1487,6 +1499,11 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int deq_flags sub_nr_running(rq, 1); dispatch_dequeue(rq, p); + + /* Stop the server if this was the last task */ + if (rq->scx.nr_running == 0) + dl_server_stop(&rq->ext_server); + return true; } @@ -2987,6 +3004,15 @@ static void switching_to_scx(struct rq *rq, struct task_struct *p) static void switched_from_scx(struct rq *rq, struct task_struct *p) { scx_disable_task(p); + + /* + * After class switch, if the DL server is still active, restart it so + * that DL timers will be queued, in case SCX switched to higher class. + */ + if (dl_server_active(&rq->ext_server)) { + dl_server_stop(&rq->ext_server); + dl_server_start(&rq->ext_server); + } } static void wakeup_preempt_scx(struct rq *rq, struct task_struct *p,int wake_flags) {} @@ -6498,8 +6524,8 @@ __bpf_kfunc u32 scx_bpf_cpuperf_cur(s32 cpu) * relative scale between 0 and %SCX_CPUPERF_ONE. This determines how the * schedutil cpufreq governor chooses the target frequency. * - * The actual performance level chosen, CPU grouping, and the overhead and - * latency of the operations are dependent on the hardware and cpufreq driver in + * The actual performance level chosen, CPU grouping, and the overhead and latency + * of the operations are dependent on the hardware and cpufreq driver in * use. Consult hardware and cpufreq documentation for more information. The * current performance level can be monitored using scx_bpf_cpuperf_cur(). */ @@ -6874,6 +6900,27 @@ BTF_ID_FLAGS(func, scx_bpf_now) BTF_ID_FLAGS(func, scx_bpf_events, KF_TRUSTED_ARGS) BTF_KFUNCS_END(scx_kfunc_ids_any) +/* + * Select the next task to run from the ext scheduling class. + */ +static struct task_struct * +ext_server_pick_task(struct sched_dl_entity *dl_se, struct rq_flags *rf) +{ + return pick_task_scx(dl_se->rq, rf); +} + +/* + * Initialize the ext server deadline entity. + */ +void ext_server_init(struct rq *rq) +{ + struct sched_dl_entity *dl_se = &rq->ext_server; + + init_dl_entity(dl_se); + + dl_server_init(dl_se, rq, ext_server_pick_task); +} + static const struct btf_kfunc_id_set scx_kfunc_set_any = { .owner = THIS_MODULE, .set = &scx_kfunc_ids_any, diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index fa2fb64c1f3bf..55f8fbb306517 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -415,6 +415,7 @@ extern void dl_server_update_idle_time(struct rq *rq, struct task_struct *p, struct sched_dl_entity *rq_dl_server); extern void fair_server_init(struct rq *rq); +extern void ext_server_init(struct rq *rq); extern void __dl_server_attach_root(struct sched_dl_entity *dl_se, struct rq *rq); extern int dl_server_apply_params(struct sched_dl_entity *dl_se, u64 runtime, u64 period, bool init); @@ -1153,6 +1154,7 @@ struct rq { #endif struct sched_dl_entity fair_server; + struct sched_dl_entity ext_server; #ifdef CONFIG_FAIR_GROUP_SCHED /* list of leaf cfs_rq on this CPU: */ -- 2.51.0