From: David Vernet <void@manifault.com>
To: Tejun Heo <tj@kernel.org>
Cc: peterz@infradead.org, mingo@redhat.com, kernel-team@meta.com,
linux-kernel@vger.kernel.org, sched-ext@meta.com,
Daniel Hodges <hodges.daniel.scott@gmail.com>,
Changwoo Min <multics69@gmail.com>,
Andrea Righi <andrea.righi@linux.dev>,
Dan Schatzberg <schatzberg.dan@gmail.com>
Subject: Re: [PATCH 3/3] sched_ext, scx_qmap: Add and use SCX_ENQ_CPU_SELECTED
Date: Fri, 27 Sep 2024 19:39:24 -0500 [thread overview]
Message-ID: <20240928003924.GC2717@maniforge> (raw)
In-Reply-To: <20240927234838.152112-4-tj@kernel.org>
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On Fri, Sep 27, 2024 at 01:46:13PM -1000, Tejun Heo wrote:
> scx_qmap and other schedulers in the SCX repo are using SCX_ENQ_WAKEUP to
> tell whether ops.select_cpu() was called. This is incorrect as
> ops.select_cpu() can be skipped in the wakeup path and leads to e.g.
> incorrectly skipping direct dispatch for tasks that are bound to a single
> CPU.
>
> sched core has been udpated to specify ENQUEUE_RQ_SELECTED if
s/udpated/updated
> ->select_task_rq() was called. Map it to SCX_ENQ_CPU_SELECTED and update
> scx_qmap to test it instead of SCX_ENQ_WAKEUP.
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David Vernet <void@manifault.com>
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next prev parent reply other threads:[~2024-09-28 0:39 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-27 23:46 [PATCHSET sched/urgent, sched_ext/for-6.12-fixes] sched/core, sched_ext: Add ENQUEUE_RQ_SELECTED to fix ->select_task_rq() skip detection in sched_ext schedulers Tejun Heo
2024-09-27 23:46 ` [PATCH 1/3] sched/core: Make select_task_rq() take the pointer to wake_flags instead of value Tejun Heo
2024-09-28 0:38 ` David Vernet
2024-09-27 23:46 ` [PATCH 2/3] sched/core: Add ENQUEUE_RQ_SELECTED to indicate whether ->select_task_rq() was called Tejun Heo
2024-09-28 0:38 ` David Vernet
2024-10-01 20:12 ` Tejun Heo
2024-10-04 20:14 ` Tejun Heo
2024-10-05 9:38 ` Peter Zijlstra
2024-10-07 16:44 ` Tejun Heo
2024-09-27 23:46 ` [PATCH 3/3] sched_ext, scx_qmap: Add and use SCX_ENQ_CPU_SELECTED Tejun Heo
2024-09-28 0:39 ` David Vernet [this message]
2024-09-28 13:21 ` Andrea Righi
2024-09-28 16:52 ` Tejun Heo
2024-10-07 20:20 ` [PATCHSET sched/urgent, sched_ext/for-6.12-fixes] sched/core, sched_ext: Add ENQUEUE_RQ_SELECTED to fix ->select_task_rq() skip detection in sched_ext schedulers Tejun Heo
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