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From: Tejun Heo <tj@kernel.org>
To: Changwoo Min <changwoo@igalia.com>
Cc: void@manifault.com, arighi@nvidia.com, kernel-dev@igalia.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/2] sched_ext: Add a core event and update scx schedulers
Date: Fri, 7 Feb 2025 11:25:44 -1000	[thread overview]
Message-ID: <Z6Z6WGLjArpPE9GO@slm.duckdns.org> (raw)
In-Reply-To: <20250207064052.399227-1-changwoo@igalia.com>

On Fri, Feb 07, 2025 at 03:40:50PM +0900, Changwoo Min wrote:
> This patchset introduces a new event, SCX_EV_ENQ_SLICE_DFL, and updates
> two scx schedulers -- scx_qmap and scx_central -- to print out the new
> event.
> 
> SCX_EV_ENQ_SLICE_DFL counts how many times the tasks' time slice is set
> to the default value (SCX_SLICE_DFL) by the sched_ext core in the enqueue
> and pick_next paths.
> 
> Scheduling a task with SCX_SLICE_DFL unintentionally would be a source
> of latency spikes because SCX_SLICE_DFL is relatively long (20 msec).
> Thus, soaring the SCX_EV_ENQ_SLICE_DFL value would be a sign of BPF
> scheduler bugs, causing latency spikes.

Applied to sched_ext/for-6.15.

Thanks.

-- 
tejun

      parent reply	other threads:[~2025-02-07 21:25 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-02-07  6:40 Changwoo Min
2025-02-07  6:40 ` [PATCH v2 1/2] sched_ext: Add an event, SCX_EV_ENQ_SLICE_DFL Changwoo Min
2025-02-07  6:40 ` [PATCH v2 2/2] sched_ext: Print an event, SCX_EV_ENQ_SLICE_DFL, in scx_qmap/central Changwoo Min
2025-02-07  6:46 ` [PATCH v2 0/2] sched_ext: Add a core event and update scx schedulers Andrea Righi
2025-02-07 21:25 ` Tejun Heo [this message]

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