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From: Tejun Heo <tj@kernel.org>
To: sashiko-bot@kernel.org
Cc: sched-ext@lists.linux.dev
Subject: Re: [PATCH v2 sched_ext/for-7.3 28/36] sched_ext: Tie cpu occupancy to SCX_CAP_BASE through the task slice
Date: Mon, 06 Jul 2026 13:40:51 -1000	[thread overview]
Message-ID: <476b6d543d0360f4eceb3badbe5d75e8@kernel.org> (raw)
In-Reply-To: <20260706020716.78CA41F000E9@smtp.kernel.org>

On Mon, 06 Jul 2026 02:07:15 +0000, sashiko-bot wrote:
> - [High] Deferred out-of-band slice requests (slice_oob) are ignored and wiped when a task is dispatched or picked, leading to silent loss of the requested slice and potential soft lockups.

Confirmed, fixed for v3. set_next_task_scx() now flushes any pending
out-of-band request before evaluating CAN_STOP_TICK, and the flush is folded
into refill_task_slice_dfl() so every refill path applies a pending request
instead of wiping it.

  reply	other threads:[~2026-07-06 23:40 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-06  1:40 [PATCHSET v2 sched_ext/for-7.3] sched_ext: Capability-based CPU delegation for sub-schedulers Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 01/36] sched_ext: Add SCX_CALL_CID_OP_TASK() for cid-form op dispatch Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 02/36] sched_ext: Rename extra_enq_flags to remote_activate_enq_flags Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 03/36] sched_ext: Fix premature ops->priv publication in scx_alloc_and_add_sched() Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 04/36] tools/sched_ext: scx - Fix cmask_subset(), cmask_equal() and cmask_weight() Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 05/36] sched_ext: Use READ_ONCE/WRITE_ONCE in cmask word ops and drop _RACY variants Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 06/36] tools/sched_ext: scx_qmap - Use bare u64/u32/s32 integer types Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 07/36] sched_ext: Reject direct slice and dsq_vtime writes for cid-form schedulers Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 08/36] sched_ext: Make scx_bpf_kick_cid() return void Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 09/36] sched_ext: Make the kick machinery per-sched Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 10/36] sched_ext: Add ops.init_cids() to finalize the cid layout before init Tejun Heo
2026-07-06  2:08   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 11/36] sched_ext: Add CID sharding Tejun Heo
2026-07-06  1:53   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 12/36] sched_ext: Add shard boundaries to scx_bpf_cid_override() Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 13/36] sched_ext: Defer scx_sched kobj sysfs add into the enable workfns Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 14/36] sched_ext: Add per-shard scx_sched storage scaffolding Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 15/36] sched_ext: Add scx_cmask_ref for validated arena cmask access Tejun Heo
2026-07-06  1:58   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  9:04   ` Andrea Righi
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 16/36] sched_ext: Build the set_cmask scratch from trusted geometry Tejun Heo
2026-07-06  1:59   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 17/36] sched_ext: RCU-protect the sub-sched tree's children/sibling lists Tejun Heo
2026-07-06  2:08   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 18/36] sched_ext: Add scx_skip_subtree_pre() Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 19/36] sched_ext: Add per-shard cap delegation for sub-schedulers Tejun Heo
2026-07-06  2:13   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 20/36] sched_ext: Add coalescing sub_caps_updated() notifier " Tejun Heo
2026-07-06  2:06   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 21/36] sched_ext: Maintain per-cpu effective cap copies for single-read checks Tejun Heo
2026-07-06  2:07   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 22/36] sched_ext: Add sub_ecaps_updated() effective-cap change notifier Tejun Heo
2026-07-06  2:09   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 23/36] sched_ext: Generalize local-DSQ handling to rq-owned DSQs Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 24/36] sched_ext: Add reject DSQ for cap-rejected dispatches Tejun Heo
2026-07-06  2:08   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 25/36] sched_ext: Add the SCX_CAP_ENQ_IMMED cap Tejun Heo
2026-07-06  2:10   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 26/36] sched_ext: Assign a unique id to each scheduler instance Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 27/36] sched_ext: Route task slice writes through set_task_slice() Tejun Heo
2026-07-06  2:05   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  9:10   ` Andrea Righi
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 28/36] sched_ext: Tie cpu occupancy to SCX_CAP_BASE through the task slice Tejun Heo
2026-07-06  2:07   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo [this message]
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 29/36] sched_ext: Add the SCX_CAP_ENQ cap Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 30/36] sched_ext: Gate kicks on SCX_CAP_BASE and preemption on SCX_CAP_PREEMPT Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 31/36] sched_ext: Authorize remote-move inserts against the placing scheduler Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 32/36] sched_ext: Route ops.update_idle() to sub-schedulers and re-notify owed scheds Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 33/36] sched_ext: Replay ecaps notifications suppressed by bypass Tejun Heo
2026-07-06  2:11   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 34/36] sched_ext: Add scx_bpf_sub_kill() to evict a child sub-scheduler Tejun Heo
2026-07-06  2:12   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 35/36] tools/sched_ext: scx_qmap - Expand hierarchical sub-scheduling Tejun Heo
2026-07-06  2:10   ` sashiko-bot
2026-07-06 23:40     ` Tejun Heo
2026-07-06  1:40 ` [PATCH v2 sched_ext/for-7.3 36/36] tools/sched_ext: scx_qmap - Add sub-sched cap fault injection Tejun Heo

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