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From: Tejun Heo <tj@kernel.org>
To: Andrea Righi <arighi@nvidia.com>
Cc: David Vernet <void@manifault.com>,
	Changwoo Min <changwoo@igalia.com>,
	sched-ext@lists.linux.dev, Emil Tsalapatis <emil@etsalapatis.com>,
	linux-kernel@vger.kernel.org,
	Cheng-Yang Chou <yphbchou0911@gmail.com>
Subject: Re: [PATCH 08/17] sched_ext: Add scx_bpf_cid_override() kfunc
Date: Wed, 29 Apr 2026 07:06:46 -1000	[thread overview]
Message-ID: <cfed3836a31231df1b6119d02f77ecb8@kernel.org> (raw)
In-Reply-To: <afIQmB4H6li6jL4I@gpd4>

Hello,

I don't think we need to gate it. The override clears scx_cid_topo[]
to SCX_CID_TOPO_NEG, so subsequent scx_bpf_cid_topo() lookups return
the well-defined "no topo" sentinel. The scheduler that overrode the
mapping has already opted out of the auto-probed topology.

Thanks.

--
tejun

  reply	other threads:[~2026-04-29 17:06 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-28 20:35 [PATCHSET v3 sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
2026-04-28 20:35 ` [PATCH 01/17] sched_ext: Add ext_types.h for early subsystem-wide defs Tejun Heo
2026-04-28 20:35 ` [PATCH 02/17] sched_ext: Rename ops_cpu_valid() to scx_cpu_valid() and expose it Tejun Heo
2026-04-28 20:35 ` [PATCH 03/17] sched_ext: Move scx_exit(), scx_error() and friends to ext_internal.h Tejun Heo
2026-04-28 20:35 ` [PATCH 04/17] sched_ext: Shift scx_kick_cpu() validity check to scx_bpf_kick_cpu() Tejun Heo
2026-04-28 20:35 ` [PATCH 05/17] sched_ext: Relocate cpu_acquire/cpu_release to end of struct sched_ext_ops Tejun Heo
2026-04-28 20:35 ` [PATCH 06/17] sched_ext: Make scx_enable() take scx_enable_cmd Tejun Heo
2026-04-28 20:35 ` [PATCH 07/17] sched_ext: Add topological CPU IDs (cids) Tejun Heo
2026-04-28 20:35 ` [PATCH 08/17] sched_ext: Add scx_bpf_cid_override() kfunc Tejun Heo
2026-04-29 14:07   ` Andrea Righi
2026-04-29 17:06     ` Tejun Heo [this message]
2026-04-29 17:20       ` Andrea Righi
2026-04-28 20:35 ` [PATCH 09/17] tools/sched_ext: Add struct_size() helpers to common.bpf.h Tejun Heo
2026-04-28 20:35 ` [PATCH 10/17] sched_ext: Add cmask, a base-windowed bitmap over cid space Tejun Heo
2026-04-29 12:47   ` Changwoo Min
2026-04-29 17:16     ` Tejun Heo
2026-04-28 20:35 ` [PATCH 11/17] sched_ext: Add cid-form kfunc wrappers alongside cpu-form Tejun Heo
2026-04-28 20:35 ` [PATCH 12/17] sched_ext: Add bpf_sched_ext_ops_cid struct_ops type Tejun Heo
2026-04-28 20:35 ` [PATCH 13/17] sched_ext: Forbid cpu-form kfuncs from cid-form schedulers Tejun Heo
2026-04-28 20:35 ` [PATCH 14/17] tools/sched_ext: scx_qmap: Restart on hotplug instead of cpu_online/offline Tejun Heo
2026-04-28 20:35 ` [PATCH 15/17] tools/sched_ext: scx_qmap: Add cmask-based idle tracking and cid-based idle pick Tejun Heo
2026-04-28 20:35 ` [PATCH 16/17] tools/sched_ext: scx_qmap: Port to cid-form struct_ops Tejun Heo
2026-04-29 12:47   ` Changwoo Min
2026-04-29 13:53     ` Andrea Righi
2026-04-29 16:42       ` Tejun Heo
2026-04-28 20:35 ` [PATCH 17/17] sched_ext: Require cid-form struct_ops for sub-sched support Tejun Heo
2026-04-29 12:49 ` [PATCHSET v3 sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Changwoo Min
2026-04-29 13:29 ` Andrea Righi
2026-04-29 14:11   ` Andrea Righi
2026-04-29 17:06   ` Tejun Heo
  -- strict thread matches above, loose matches on Subject: below --
2026-04-29 18:21 [PATCHSET v4 " Tejun Heo
2026-04-29 18:21 ` [PATCH 08/17] sched_ext: Add scx_bpf_cid_override() kfunc Tejun Heo
2026-04-24 17:27 [PATCHSET v2 REPOST sched_ext/for-7.2] sched_ext: Topological CPU IDs and cid-form struct_ops Tejun Heo
2026-04-24 17:27 ` [PATCH 08/17] sched_ext: Add scx_bpf_cid_override() kfunc Tejun Heo
2026-04-24  1:32 Tejun Heo

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