From: Tejun Heo <tj@kernel.org>
To: David Vernet <void@manifault.com>,
Andrea Righi <arighi@nvidia.com>,
Changwoo Min <changwoo@igalia.com>
Cc: sched-ext@lists.linux.dev, Emil Tsalapatis <emil@etsalapatis.com>,
linux-kernel@vger.kernel.org
Subject: [PATCHSET sched_ext/for-7.3] sched_ext: Follow-up fixes and missing cap enforcement
Date: Fri, 24 Jul 2026 08:21:20 -1000 [thread overview]
Message-ID: <20260724182125.985061-1-tj@kernel.org> (raw)
Hello,
Follow-up fixes and enforcement holes plugged from the recent
sub-scheduler work. The first patch fixes the tools' restart loop
clobbering an exit that was requested while a restart was pending.
The rest tighten how cid-addressed operations from sub-schedulers are
handled when the caller lacks the necessary caps. Reenq to another
sched's local DSQs is now denied and counted, and a new event counts
the already-denied kicks. These checks are lockless - transient false
positives from cap rotation are harmless and false negatives can't
happen by visibility. cpuperf control moves behind a new SCX_CAP_PERF
which only the root holds by default, and scx_bpf_cidperf_set() reports
the result synchronously through a new versioned interface as its check
is authoritative under the target's rq lock.
0001-tools-sched_ext-Don-t-restart-over-a-pending-exit-re.patch
0002-sched_ext-Gate-local-DSQ-reenq-on-baseline-cid-acces.patch
0003-sched_ext-Count-kicks-denied-for-lacking-baseline-ci.patch
0004-sched_ext-Factor-out-scx_cpuperf_set.patch
0005-sched_ext-Gate-scx_bpf_cidperf_set-behind-a-new-SCX_.patch
Based on sched_ext/for-7.3 (c509d8107026).
The patches are also available in the following git branch:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git scx-sub-cap-gates
diffstat follows. Thanks.
kernel/sched/ext/ext.c | 152 ++++++++++++++++++++++---------
kernel/sched/ext/internal.h | 31 ++++++-
tools/sched_ext/include/scx/common.bpf.h | 2 +-
tools/sched_ext/include/scx/compat.bpf.h | 18 ++++
tools/sched_ext/scx_central.c | 2 +-
tools/sched_ext/scx_cpu0.c | 2 +-
tools/sched_ext/scx_flatcg.c | 2 +-
tools/sched_ext/scx_pair.c | 2 +-
tools/sched_ext/scx_qmap.bpf.c | 17 ++--
tools/sched_ext/scx_qmap.c | 2 +-
tools/sched_ext/scx_sdt.c | 2 +-
tools/sched_ext/scx_simple.c | 2 +-
tools/sched_ext/scx_userland.c | 11 ++-
13 files changed, 181 insertions(+), 64 deletions(-)
--
tejun
next reply other threads:[~2026-07-24 18:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-24 18:21 Tejun Heo [this message]
2026-07-24 18:21 ` [PATCH 1/5] tools/sched_ext: Don't restart over a pending exit request Tejun Heo
2026-07-24 18:21 ` [PATCH 2/5] sched_ext: Gate local DSQ reenq on baseline cid access Tejun Heo
2026-07-24 18:21 ` [PATCH 3/5] sched_ext: Count kicks denied for lacking " Tejun Heo
2026-07-24 18:21 ` [PATCH 4/5] sched_ext: Factor out scx_cpuperf_set() Tejun Heo
2026-07-24 18:21 ` [PATCH 5/5] sched_ext: Gate scx_bpf_cidperf_set() behind a new SCX_CAP_PERF Tejun Heo
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