linux-kernel - [PATCHSET sched_ext/for-6.11] sched_ext: Fix scx_bpf_reenqueue

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Message-ID: <20240709211001.1198145-1-tj@kernel.org>
Date: Tue,  9 Jul 2024 11:09:41 -1000
From: Tejun Heo <tj@...nel.org>
To: void@...ifault.com
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	schatzberg.dan@...il.com
Subject: [PATCHSET sched_ext/for-6.11] sched_ext: Fix scx_bpf_reenqueue_local()

Fix scx_bpf_reenqueue_local()'s misbehaviors in two cases:

- when SCX_ENQ_HEAD is used to dispatch a re-enqueued task back to the same
  local DSQ.

- when the CPU is being preempted by stop_task for task migration.

This patchset contains the following two patches:

 0001-sched_ext-Reimplement-scx_bpf_reenqueue_local.patch
 0002-sched_ext-Make-scx_bpf_reenqueue_local-skip-tasks-th.patch

and is also available in the following git branch:

 git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git scx-fix-reenqueue_local

diffstat follows. Thanks.

 kernel/sched/ext.c |   40 +++++++++++++++++++++++++++-------------
 1 file changed, 27 insertions(+), 13 deletions(-)

--
tejun