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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?uHba19dysal1BJkj8CJpXaw944TUJdBa06RkyH961htVs3/J6IHtVwdF5oO2?= =?us-ascii?Q?ydUzrP/w/P+L1nGJPlFEnyruyRYwoQR+oLTyfJn4ZBAUKrZFUIxLiOVm3Ehm?= =?us-ascii?Q?KyFsvMVxdk5cqbOaX1pVfOV25XVNVUi/WoqcHSsF9VaHrgMtApWxZAg+AtFa?= =?us-ascii?Q?9WajENJpaYD8zcCoxl50UVdc3daTh3KP0DJPPKrb0uj1mf50PZ4HhfIPd/sK?= =?us-ascii?Q?hlWwaQvJxofdlsiXL0ZgHtgJa7ngdjEu7Fy7HDMQIzEnyxXcH/cemQgwtgvs?= =?us-ascii?Q?p9qYWoZRQMvnJ5vVDnLfQCvbyFhhhTVg7Nze4l6XmWJsaaDapCJLoCBDZUKH?= =?us-ascii?Q?p+uLrb+RQHxHHRDXRaunaIvJ0rVyo0XHjaSENECH6Hd3FmUfceWTSWilqLav?= =?us-ascii?Q?pyv9KPVAAKjd0R+HvmOGn52MI6btOZuue/5xquIa7koZ7myPZNVGZDWOspc4?= =?us-ascii?Q?9wFRQAHDaJTBFSosmhoKF0XKtRQXR4HHBMaHomfdN4n5w3vlnFZNHoKLySm+?= =?us-ascii?Q?mPPUxBXMZ3rMWEN8XZz8RLegNgaTKbHBQaBr9YpJ31+OQBYytTcmJv7QrRYX?= =?us-ascii?Q?bqGQtg3T2Hpu5D5vaUuys1oK0GnGBYyEGFR1kcJ4BR+2w+iBN4VgVRCVI+Kf?= =?us-ascii?Q?+teNFk4u7N4RtgWiho0hLkULbWBG96yv3tQ0rrMUN8xu/vTwZDFnGsX+QnPa?= =?us-ascii?Q?NaOckifuKGSh1zWkfpGhrKo1ffhsjL9/T0WeNYSm7+9GF9HgGveM11waEOjx?= =?us-ascii?Q?EjwiV9hpykIX5/303EQsIVB7IdXc0haF0a7Za8mQEKfjg6Ocod3tQEpw52I3?= =?us-ascii?Q?dSw3MPa7ITSvZRP1HC6369Zuq7MYDLkWktLkCZjdMnH83faD7rZiaSoHrCLF?= =?us-ascii?Q?XkayqY6LSb1lhnJur+PAo8q4veAD+N47/Zu4THFSyEAXcxP6Wz6jyDKfBaI4?= =?us-ascii?Q?IIpHFAEyezPUKl9cIirXvjBYEV9pYEtiCuXMk/zrslnEiOreAoUHWs/v+9P8?= =?us-ascii?Q?BoPI2bPxvr91xEKAGwBq14RYtOWoWuYGxDaghM5lEIFf7JcjopDTZpm6R+qR?= =?us-ascii?Q?GWcQ9PlQb2TYs3YepueyvlxPfMApdtRIDBrzVK8AYJs2nzxaBUfhV2QtPqRR?= =?us-ascii?Q?ZSvK34QLnMgKijVYFC+BjVWZvtob6Q4Ca7H+jlrf15iXb/49PyyrdzxlCZIg?= =?us-ascii?Q?4h/lWkC6z7BVn9I1ki6gx34Ip83l/jmVFissHEWxc7lGoThf5gJNEMNchd8o?= =?us-ascii?Q?6LZOOMAKQzrx9K1Bp1HhQc1yL02rv9VyCYjlEDJm/fFMTP+f4AgpSWyaaF/u?= =?us-ascii?Q?e+eNM/9lcq9ZKDgEfX5k6npntA3gJwFIorTLTMVoFjF5fav7EUES9qmNXngV?= =?us-ascii?Q?9ilcXWRBCXkeaexWroTifeswAuwfJ3eTna7Luhn+04lMpQqijw/TpAdr+cQI?= =?us-ascii?Q?DPTIWQtvQEMyQqkxDYVu6tJpoPyD5hZ27jqRmw+XnB5JYG2a7kIpY9LmRPM5?= =?us-ascii?Q?VHMYbLXrzUsFLwZJxvXMFmTh6RZwS9BZ5MvkYqLq8FqGYPWnUuXexccO+8nl?= =?us-ascii?Q?Ub2MedmIqJsqpy1QvW2JqGjySNPgzODUzHuQIi4M8muG6BMs0qlJGORudxia?= =?us-ascii?Q?nxsIBvAk9v6QOSTr2jqSTRKU1Etz66U8M7sEq+asyLBzoP+ku6r/tUQ88pI7?= =?us-ascii?Q?8WrYBkWjAsMgsGr5sESxJdWrKgVDWEQP5saS8sdnyg1okEAXuiSnsgwsdVzX?= =?us-ascii?Q?IwCBtpX2Jw=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9793f6d9-df0a-4c13-2a57-08def6f25ad9 X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB4827.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Aug 2026 15:16:30.1574 (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: w6ABh0mJHFSsIAuYP1QvlMN6ZC3e5MmSwXm9rNNVx6CbeDKSVlMClcx5nawrxv+whF7vuMYBdZKr6Jx0VIKxlw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8327 With proxy execution, pick_next_task() can select a blocked task as the scheduling context before find_proxy_task() resolves the execution context. >From the BPF scheduler perspective, that donor is running while its scheduling context drives the lock owner; ops.tick() and other accounting must therefore remain enclosed by a matching ops.running()/ops.stopping() session. In this scenario, the session boundaries do not always match physical task switches. Keep the "running" session open when the same donor continues on the same CPU. When proxy execution migrates a donor's scheduling context to another CPU, end its running session on the source CPU and start a new session on the destination CPU only after proxy resolution succeeds. This prevents a failed resolution from exposing a provisional ops.running() event. Track these sessions with a new SCX_TASK_RUN_TRACKED flag. This is a preparatory change for enabling proxy execution together with sched_ext. The explicit running-state tracking is also required by later donor-based accounting: it prevents an EXT owner executing for a non-EXT donor from being treated as the active EXT scheduling context when it is dequeued. Acked-by: John Stultz Signed-off-by: Andrea Righi --- include/linux/sched/ext.h | 1 + kernel/sched/ext/ext.c | 65 ++++++++++++++++++++++++++++--------- kernel/sched/ext/internal.h | 6 ++++ 3 files changed, 56 insertions(+), 16 deletions(-) diff --git a/include/linux/sched/ext.h b/include/linux/sched/ext.h index a3ec980e29259..c34744c493885 100644 --- a/include/linux/sched/ext.h +++ b/include/linux/sched/ext.h @@ -104,6 +104,7 @@ enum scx_ent_flags { SCX_TASK_SUB_INIT = 1 << 4, /* task being initialized for a sub sched */ SCX_TASK_IMMED = 1 << 5, /* task is on local DSQ with %SCX_ENQ_IMMED */ SCX_TASK_PROTECTED = 1 << 6, /* slice and DSQ head position protected */ + SCX_TASK_RUN_TRACKED = 1 << 7, /* task is in an ops.running()/stopping() session */ /* * Bits 8 to 10 are used to carry task state: diff --git a/kernel/sched/ext/ext.c b/kernel/sched/ext/ext.c index 5efbd80304dae..0958622d4382d 100644 --- a/kernel/sched/ext/ext.c +++ b/kernel/sched/ext/ext.c @@ -2334,10 +2334,10 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int core_deq_ ops_dequeue(rq, p, deq_flags); /* - * A currently running task which is going off @rq first gets dequeued - * and then stops running. As we want running <-> stopping transitions - * to be contained within runnable <-> quiescent transitions, trigger - * ->stopping() early here instead of in put_prev_task_scx(). + * A current scheduling context which is going off @rq first gets + * dequeued and then stops running. As we want running <-> stopping + * transitions to be contained within runnable <-> quiescent transitions, + * trigger ->stopping() early here instead of in put_prev_task_scx(). * * @p may go through multiple stopping <-> running transitions between * here and put_prev_task_scx() if task attribute changes occur while @@ -2345,11 +2345,13 @@ static bool dequeue_task_scx(struct rq *rq, struct task_struct *p, int core_deq_ * information meaningful to the BPF scheduler and can be suppressed by * skipping the callbacks if the task is !QUEUED. */ - if (task_current(rq, p) && - (SCX_HAS_OP(sch, stopping) || unlikely(p == scx_rescuee(rq)))) { - update_curr_scx(rq); - if (SCX_HAS_OP(sch, stopping)) - SCX_CALL_OP_TASK(sch, stopping, rq, p, false); + if (task_current_donor(rq, p) && (p->scx.flags & SCX_TASK_RUN_TRACKED)) { + if (SCX_HAS_OP(sch, stopping) || unlikely(p == scx_rescuee(rq))) { + update_curr_scx(rq); + if (SCX_HAS_OP(sch, stopping)) + SCX_CALL_OP_TASK(sch, stopping, rq, p, false); + } + p->scx.flags &= ~SCX_TASK_RUN_TRACKED; } if (SCX_HAS_OP(sch, quiescent) && !task_on_rq_migrating(p)) @@ -3052,10 +3054,21 @@ static int balance_one(struct rq *rq, struct task_struct *prev) return true; } -static void set_next_task_scx(struct rq *rq, struct task_struct *p, bool first) +static void scx_start_task_running(struct rq *rq, struct task_struct *p) { struct scx_sched *sch = scx_task_sched(p); + if (p->scx.flags & SCX_TASK_RUN_TRACKED) + return; + + if (SCX_HAS_OP(sch, running)) + SCX_CALL_OP_TASK(sch, running, rq, p); + + p->scx.flags |= SCX_TASK_RUN_TRACKED; +} + +static void set_next_task_scx(struct rq *rq, struct task_struct *p, bool first) +{ if (p->scx.flags & SCX_TASK_QUEUED) { /* * Core-sched might decide to execute @p before it is @@ -3067,9 +3080,14 @@ static void set_next_task_scx(struct rq *rq, struct task_struct *p, bool first) p->se.exec_start = rq_clock_task(rq); - /* see dequeue_task_scx() on why we skip when !QUEUED */ - if (SCX_HAS_OP(sch, running) && (p->scx.flags & SCX_TASK_QUEUED)) - SCX_CALL_OP_TASK(sch, running, rq, p); + /* + * See dequeue_task_scx() for why we skip when !QUEUED. On a normal + * scheduling transition, defer starting a blocked donor's session until + * proxy resolution succeeds. A restore follows an already resolved + * scheduling context and can start the session immediately. + */ + if ((p->scx.flags & SCX_TASK_QUEUED) && (!p->is_blocked || !first)) + scx_start_task_running(rq, p); clr_task_runnable(p, true); @@ -3115,6 +3133,13 @@ static void set_next_task_scx(struct rq *rq, struct task_struct *p, bool first) void scx_proxy_donor_start(struct rq *rq) { + struct task_struct *donor = rq->donor; + + lockdep_assert_rq_held(rq); + + if (donor->sched_class == &ext_sched_class && + (donor->scx.flags & SCX_TASK_QUEUED)) + scx_start_task_running(rq, donor); } static enum scx_cpu_preempt_reason @@ -3190,9 +3215,17 @@ static void put_prev_task_scx(struct rq *rq, struct task_struct *p, scx_task_slice_ended(rq, p); } - /* see dequeue_task_scx() on why we skip when !QUEUED */ - if (SCX_HAS_OP(sch, stopping) && (p->scx.flags & SCX_TASK_QUEUED)) - SCX_CALL_OP_TASK(sch, stopping, rq, p, true); + /* + * Preserve the running session when proxy execution refreshes the same + * donor around an execution-context switch on this rq. + */ + if (next != p && (p->scx.flags & SCX_TASK_QUEUED) && + (p->scx.flags & SCX_TASK_RUN_TRACKED)) { + if (SCX_HAS_OP(sch, stopping)) + SCX_CALL_OP_TASK(sch, stopping, rq, p, true); + + p->scx.flags &= ~SCX_TASK_RUN_TRACKED; + } if (p->scx.flags & SCX_TASK_QUEUED) { set_task_runnable(rq, p); diff --git a/kernel/sched/ext/internal.h b/kernel/sched/ext/internal.h index b699e7c1103fc..c458a12c64574 100644 --- a/kernel/sched/ext/internal.h +++ b/kernel/sched/ext/internal.h @@ -449,6 +449,12 @@ struct sched_ext_ops { * Therefore, always use scx_bpf_task_cpu(@p) to determine the * target CPU the task is going to use. * + * Under proxy execution, the BPF scheduler continues to observe the + * donor as the current scheduling context. A blocked donor enters a + * ->running()/->stopping() session while its scheduling context drives + * the lock owner. The lock owner executing on its behalf is intentionally + * not reported through these callbacks. + * * See ->runnable() for explanation on the task state notifiers. */ void (*running)(struct task_struct *p); -- 2.55.0